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Kurokawa K, Isono S, Kohama Y, Kunisada S, Sakai S, Sekine R, Okubo M, Watson MD, Kim TK, Cacho C, Shin S, Tohyama T, Tokiwa K, Kondo T. Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed. Nat Commun 2023; 14:4064. [PMID: 37452014 PMCID: PMC10349131 DOI: 10.1038/s41467-023-39457-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 06/08/2023] [Indexed: 07/18/2023] Open
Abstract
The currently established electronic phase diagram of cuprates is based on a study of single- and double-layered compounds. These CuO2 planes, however, are directly contacted with dopant layers, thus inevitably disordered with an inhomogeneous electronic state. Here, we solve this issue by investigating a 6-layered Ba2Ca5Cu6O12(F,O)2 with inner CuO2 layers, which are clean with the extremely low disorder, by angle-resolved photoemission spectroscopy (ARPES) and quantum oscillation measurements. We find a tiny Fermi pocket with a doping level less than 1% to exhibit well-defined quasiparticle peaks which surprisingly lack the polaronic feature. This provides the first evidence that the slightest amount of carriers is enough to turn a Mott insulating state into a metallic state with long-lived quasiparticles. By tuning hole carriers, we also find an unexpected phase transition from the superconducting to metallic states at 4%. Our results are distinct from the nodal liquid state with polaronic features proposed as an anomaly of the heavily underdoped cuprates.
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Affiliation(s)
- Kifu Kurokawa
- ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Shunsuke Isono
- Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan
| | | | - So Kunisada
- ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Shiro Sakai
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan
| | - Ryotaro Sekine
- Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan
| | - Makoto Okubo
- Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan
| | - Matthew D Watson
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
| | - Timur K Kim
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
| | - Cephise Cacho
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
| | - Shik Shin
- ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
- Office of University Professor, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Takami Tohyama
- Department of Applied Physics, Tokyo University of Science, Tokyo, 125-8585, Japan
| | - Kazuyasu Tokiwa
- Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan.
| | - Takeshi Kondo
- ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan.
- Trans-scale Quantum Science Institute, The University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan.
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2
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Momentum-resolved visualization of electronic evolution in doping a Mott insulator. Nat Commun 2021; 12:1356. [PMID: 33649302 PMCID: PMC7921433 DOI: 10.1038/s41467-021-21605-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 01/29/2021] [Indexed: 11/25/2022] Open
Abstract
High temperature superconductivity in cuprates arises from doping a parent Mott insulator by electrons or holes. A central issue is how the Mott gap evolves and the low-energy states emerge with doping. Here we report angle-resolved photoemission spectroscopy measurements on a cuprate parent compound by sequential in situ electron doping. The chemical potential jumps to the bottom of the upper Hubbard band upon a slight electron doping, making it possible to directly visualize the charge transfer band and the full Mott gap region. With increasing doping, the Mott gap rapidly collapses due to the spectral weight transfer from the charge transfer band to the gapped region and the induced low-energy states emerge in a wide energy range inside the Mott gap. These results provide key information on the electronic evolution in doping a Mott insulator and establish a basis for developing microscopic theories for cuprate superconductivity. How a Mott insulating state evolves into a conducting or superconducting state is a central issue in doping a Mott insulator and important to understand the physics in high temperature cuprate superconductors. Here, the authors visualize the electronic structure evolution of a Mott insulator within the full Mott gap region and address the fundamental issues.
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3
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Horio M, Fujimori A. ARPES studies on new types of electron-doped cuprate superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:503001. [PMID: 30468154 DOI: 10.1088/1361-648x/aab824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
For more than thirty years since the discovery of superconductivity in cuprates, it has been widely agreed that the superconductivity is realized by doping a charge-transfer insulator with charge carriers through chemical substitution. For electron-doped cuprates, however, the recent development of reduction annealing methods has enabled superconductivity for a very small amount of or even without chemical substitution. In this article, we review recent angle-resolved photoemission spectroscopy studies on the new types of electron-doped cuprates with particular emphasis on the effect of reduction annealing. The presented results provide us with renewed insight into the phase diagram and the nature of the pseudogap not only on the electron-doped side but also in the entire doping range including hole doping.
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Affiliation(s)
- M Horio
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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4
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Electron-hole doping asymmetry of Fermi surface reconstructed in a simple Mott insulator. Nat Commun 2016; 7:12356. [PMID: 27492864 PMCID: PMC5155723 DOI: 10.1038/ncomms12356] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Accepted: 06/24/2016] [Indexed: 11/21/2022] Open
Abstract
It is widely recognized that the effect of doping into a Mott insulator is complicated and unpredictable, as can be seen by examining the Hall coefficient in high Tc cuprates. The doping effect, including the electron–hole doping asymmetry, may be more straightforward in doped organic Mott insulators owing to their simple electronic structures. Here we investigate the doping asymmetry of an organic Mott insulator by carrying out electric-double-layer transistor measurements and using cluster perturbation theory. The calculations predict that strongly anisotropic suppression of the spectral weight results in the Fermi arc state under hole doping, while a relatively uniform spectral weight results in the emergence of a non-interacting-like Fermi surface (FS) in the electron-doped state. In accordance with the calculations, the experimentally observed Hall coefficients and resistivity anisotropy correspond to the pocket formed by the Fermi arcs under hole doping and to the non-interacting FS under electron doping. Electron or hole doping in a Mott insulator leads to superconductivity, with the mechanism obscured by multi-orbital Fermi surface reconstructions. Here, Kawasugi et al. report doping dependent Hall coefficients and resistivity anisotropy of an organic Mott insulator, revealing doping asymmetry of reconstructed Fermi surface of a single electronic orbital.
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5
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Fermi arcs vs. Fermi pockets in electron-doped perovskite iridates. Sci Rep 2015; 5:8533. [PMID: 25704850 PMCID: PMC4336940 DOI: 10.1038/srep08533] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 01/23/2015] [Indexed: 11/09/2022] Open
Abstract
We report on an angle resolved photoemission (ARPES) study of bulk electron-doped perovskite iridate, (Sr1−xLax)3Ir2O7. Fermi surface pockets are observed with a total electron count in keeping with that expected from La substitution. Depending on the energy and polarization of the incident photons, these pockets show up in the form of disconnected “Fermi arcs”, reminiscent of those reported recently in surface electron-doped Sr2IrO4. Our observed spectral variation is consistent with the coexistence of an electronic supermodulation with structural distortion in the system.
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6
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Electronic evidence of an insulator-superconductor crossover in single-layer FeSe/SrTiO3 films. Proc Natl Acad Sci U S A 2014; 111:18501-6. [PMID: 25502774 DOI: 10.1073/pnas.1414094112] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In high-temperature cuprate superconductors, it is now generally agreed that superconductivity is realized by doping an antiferromagnetic Mott (charge transfer) insulator. The doping-induced insulator-to-superconductor transition has been widely observed in cuprates, which provides important information for understanding the superconductivity mechanism. In the iron-based superconductors, however, the parent compound is mostly antiferromagnetic bad metal, raising a debate on whether an appropriate starting point should go with an itinerant picture or a localized picture. No evidence of doping-induced insulator-superconductor transition (or crossover) has been reported in the iron-based compounds so far. Here, we report an electronic evidence of an insulator-superconductor crossover observed in the single-layer FeSe film grown on a SrTiO3 substrate. By taking angle-resolved photoemission measurements on the electronic structure and energy gap, we have identified a clear evolution of an insulator to a superconductor with increasing carrier concentration. In particular, the insulator-superconductor crossover in FeSe/SrTiO3 film exhibits similar behaviors to that observed in the cuprate superconductors. Our results suggest that the observed insulator-superconductor crossover may be associated with the two-dimensionality that enhances electron localization or correlation. The reduced dimensionality and the interfacial effect provide a new pathway in searching for new phenomena and novel superconductors with a high transition temperature.
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7
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Chan MK, Veit MJ, Dorow CJ, Ge Y, Li Y, Tabis W, Tang Y, Zhao X, Barišić N, Greven M. In-plane magnetoresistance obeys Kohler's rule in the pseudogap phase of cuprate superconductors. PHYSICAL REVIEW LETTERS 2014; 113:177005. [PMID: 25379934 DOI: 10.1103/physrevlett.113.177005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Indexed: 06/04/2023]
Abstract
We report in-plane resistivity (ρ) and transverse magnetoresistance (MR) measurements for underdoped HgBa(2)CuO(4+δ) (Hg1201). Contrary to the long-standing view that Kohler's rule is strongly violated in underdoped cuprates, we find that it is in fact satisfied in the pseudogap phase of Hg1201. The transverse MR shows a quadratic field dependence, δρ/ρ(0)=aH(2), with a(T)∝T(-4). In combination with the observed ρ∝T(2) dependence, this is consistent with a single Fermi-liquid quasiparticle scattering rate. We show that this behavior is typically masked in cuprates with lower structural symmetry or strong disorder effects.
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Affiliation(s)
- M K Chan
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - M J Veit
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - C J Dorow
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Ge
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Li
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - W Tabis
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. A. Mickiewicza 30, 30-059 Krakow, Poland
| | - Y Tang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - X Zhao
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
| | - N Barišić
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and Service de Physique de l'Etat Condensé, CEA-DSM-IRAMIS, F 91198 Gif-sur-Yvette, France and Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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8
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Peng Y, Meng J, Mou D, He J, Zhao L, Wu Y, Liu G, Dong X, He S, Zhang J, Wang X, Peng Q, Wang Z, Zhang S, Yang F, Chen C, Xu Z, Lee TK, Zhou XJ. Disappearance of nodal gap across the insulator-superconductor transition in a copper-oxide superconductor. Nat Commun 2014; 4:2459. [PMID: 24051514 DOI: 10.1038/ncomms3459] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 08/18/2013] [Indexed: 11/09/2022] Open
Abstract
The parent compound of the copper-oxide high-temperature superconductors is a Mott insulator. Superconductivity is realized by doping an appropriate amount of charge carriers. How a Mott insulator transforms into a superconductor is crucial in understanding the unusual physical properties of high-temperature superconductors and the superconductivity mechanism. Here we report high-resolution angle-resolved photoemission measurement on heavily underdoped Bi₂Sr₂-xLaxCuO(₆+δ) system. The electronic structure of the lightly doped samples exhibit a number of characteristics: existence of an energy gap along the nodal direction, d-wave-like anisotropic energy gap along the underlying Fermi surface, and coexistence of a coherence peak and a broad hump in the photoemission spectra. Our results reveal a clear insulator-superconductor transition at a critical doping level of ~0.10 where the nodal energy gap approaches zero, the three-dimensional antiferromagnetic order disappears, and superconductivity starts to emerge. These observations clearly signal a close connection between the nodal gap, antiferromagnetism and superconductivity.
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Affiliation(s)
- Yingying Peng
- National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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9
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Silva Neto MB. Anisotropy of acceptor states in lightly doped cuprate superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:365601. [PMID: 21852728 DOI: 10.1088/0953-8984/23/36/365601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate the role of short wavelength antiferromagnetic correlations in the spatial structure of acceptor states doped into a two-dimensional Mott-Hubbard antiferromagnetic insulator. We extend the traditional effective mass approximation, by using the Green's function formalism and its spectral representation, and we show that when the electronic scattering at the ordering wavevector Q = (π,π) is strong enough to produce a momentum dependent scattering rate, Γ(k), the corresponding acceptor state envelope wavefunction becomes spatially anisotropic. Finally, we discuss the connection between our results and photoemission spectra in lightly doped La(2-x)Sr(x)CuO(4).
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Affiliation(s)
- M B Silva Neto
- Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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10
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Korshunov MM, Zakharova EV, Nekrasov IA, Pchelkina ZV, Ovchinnikov SG. The Fermi surface and the role of electronic correlations in Sm(2-x)Ce(x)CuO4. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:015701. [PMID: 21386232 DOI: 10.1088/0953-8984/22/1/015701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Using a LDA+GTB (local density approximation+generalized tight-binding) hybrid scheme we investigate the band structure of the electron-doped high- T(c) material Sm(2-x)Ce(x)CuO(4). Parameters of the minimal tight-binding model for this system (the so-called three-band Emery model) were obtained within the NMTO (Nth-order muffin-tin orbital) method. The doping evolution of the dispersion and the Fermi surface in the presence of electronic correlations was investigated in two regimes of magnetic order: short-range (spin-liquid) and long-range (antiferromagnetic metal). Each regime is characterized by the specific topologies of the Fermi surfaces and we discuss their relation to recent experimental data.
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Affiliation(s)
- M M Korshunov
- Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany.
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11
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Lee WS, Tanaka K, Vishik IM, Lu DH, Moore RG, Eisaki H, Iyo A, Devereaux TP, Shen ZX. Dependence of band-renormalization effects on the number of copper oxide layers in Tl-based copper oxide superconductors revealed by angle-resolved photoemission spectroscopy. PHYSICAL REVIEW LETTERS 2009; 103:067003. [PMID: 19792598 DOI: 10.1103/physrevlett.103.067003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Indexed: 05/28/2023]
Abstract
Here we report the first angle-resolved photoemission measurement on nearly optimally doped multilayer Tl-based superconducting cuprates (Tl-2212 and Tl-1223) and a comparison study to single-layer (Tl-2201) compound. A "kink" in the band dispersion is found in all three compounds but exhibits different momentum dependence for the single-layer and multilayer compounds, reminiscent to that of Bi-based cuprates. This layer number dependent renormalization effect strongly implies that the spin-resonance mode is unlikely to be responsible for the dramatic renormalization effect near the antinodal region.
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Affiliation(s)
- W S Lee
- SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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12
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Komiya S, Tsukada I. Doping evolution of the electronic specific heat coefficient in slightly-doped La2-xSrxCuO4single crystals. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/150/5/052118] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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13
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Balakirev FF, Betts JB, Migliori A, Tsukada I, Ando Y, Boebinger GS. Quantum phase transition in the magnetic-field-induced normal state of optimum-doped high-Tc cuprate superconductors at low temperatures. PHYSICAL REVIEW LETTERS 2009; 102:017004. [PMID: 19257230 DOI: 10.1103/physrevlett.102.017004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Indexed: 05/27/2023]
Abstract
A 60 T magnetic field suppresses the superconducting transition temperature T_{c} in La_{2-p}Sr_{p}CuO_{4} to reveal a Hall number anomaly, which develops only at temperatures below zero-field T_{c} and peaks at the exact location of p that maximizes T_{c}. The anomaly bears a striking resemblance to observations in Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta}, suggesting a normal-state phenomenology common to the cuprates that underlies the high-temperature superconducting phase. The peak is ascribed to a Fermi surface reconstruction at a quantum phase transition near optimum doping that is coincident with the collapse of the pseudogap state.
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Affiliation(s)
- F F Balakirev
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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14
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15
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Hozoi L, Laad MS. Quasiparticle bands in cuprates by quantum-chemical methods: towards an ab initio description of strong electron correlations. PHYSICAL REVIEW LETTERS 2007; 99:256404. [PMID: 18233537 DOI: 10.1103/physrevlett.99.256404] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2007] [Indexed: 05/25/2023]
Abstract
Realistic electronic-structure calculations for correlated Mott insulators are notoriously difficult. Here we present an ab initio multiconfiguration scheme that adequately describes strong correlation effects involving Cu 3d and O 2p electrons in layered cuprates. In particular, the O 2p states giving rise to the Zhang-Rice band are explicitly considered. Renormalization effects due to nonlocal spin interactions are also treated consistently. We show that the dispersion of the lowest band observed in photoemission is reproduced with quantitative accuracy. Additionally, the evolution of the Fermi surface with doping follows directly from our ab initio data. Our results thus open a new avenue for the first-principles investigation of the electronic structure of correlated Mott insulators.
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Affiliation(s)
- L Hozoi
- Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, 01187 Dresden, Germany
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16
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Terashima K, Matsui H, Sato T, Takahashi T, Kofu M, Hirota K. Anomalous momentum dependence of the superconducting coherence peak and its relation to the pseudogap of La1.85Sr0.15CuO4. PHYSICAL REVIEW LETTERS 2007; 99:017003. [PMID: 17678183 DOI: 10.1103/physrevlett.99.017003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2006] [Indexed: 05/16/2023]
Abstract
We performed high-resolution angle-resolved photoemission spectroscopy on La1.85Sr0.15CuO4 to study the nature of the single-particle excitation gap. We found that there is a well-defined superconducting coherence peak in the off-nodal region while it is strongly suppressed around the antinode. The momentum dependence of the single-particle excitation gap shows a striking deviation from the dx-y2--wave symmetry with anomalous enhancement around the antinode in both the superconducting and the pseudogap state. The observed close correlation between the superconducting coherence peak and the pseudogap suggests a substantial contribution of the pseudogap to the anomalous behavior of the gap in the superconducting state.
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Affiliation(s)
- K Terashima
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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17
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Tanaka K, Lee WS, Lu DH, Fujimori A, Fujii T, Terasaki I, Scalapino DJ, Devereaux TP, Hussain Z, Shen ZX. Distinct Fermi-Momentum-Dependent Energy Gaps in Deeply Underdoped Bi2212. Science 2006; 314:1910-3. [PMID: 17114172 DOI: 10.1126/science.1133411] [Citation(s) in RCA: 327] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
We used angle-resolved photoemission spectroscopy applied to deeply underdoped cuprate superconductors Bi2Sr2Ca(1-x)YxCu2O8 (Bi2212) to reveal the presence of two distinct energy gaps exhibiting different doping dependence. One gap, associated with the antinodal region where no coherent peak is observed, increased with underdoping, a behavior known for more than a decade and considered as the general gap behavior in the underdoped regime. The other gap, associated with the near-nodal regime where a coherent peak in the spectrum can be observed, did not increase with less doping, a behavior not previously observed in the single particle spectra. We propose a two-gap scenario in momentum space that is consistent with other experiments and may contain important information on the mechanism of high-transition temperature superconductivity.
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Affiliation(s)
- Kiyohisa Tanaka
- Department of Physics, Department of Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305, USA
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18
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Gor'kov LP, Teitel'baum GB. Interplay of externally doped and thermally activated holes in La(2-x)Sr(x)CuO4 and their impact on the pseudogap crossover. PHYSICAL REVIEW LETTERS 2006; 97:247003. [PMID: 17280311 DOI: 10.1103/physrevlett.97.247003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2006] [Indexed: 05/13/2023]
Abstract
We presented the recent Hall effect data for a number of carriers in La(2-x)Sr(x)CuO4 as the sum of two components: the temperature independent term n0(x), which is due to external doping, and the thermally activated contribution. Their balance determines the crossover temperature T*(x) from the marginal Fermi liquid to pseudogap regime. The activation energy Delta(x) for thermally excited carriers equals the energy between the Fermi surface "arc" and the band bottom, as seen in angle-resolved photoemission spectroscopy experiments. Other implications for the (T, x)-phase diagram of cuprates are also discussed.
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Affiliation(s)
- Lev P Gor'kov
- NHMFL, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
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19
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Chen Y, Iyo A, Yang W, Zhou X, Lu D, Eisaki H, Devereaux TP, Hussain Z, Shen ZX. Anomalous Fermi-surface dependent pairing in a self-doped high-Tc superconductor. PHYSICAL REVIEW LETTERS 2006; 97:236401. [PMID: 17280217 DOI: 10.1103/physrevlett.97.236401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Indexed: 05/13/2023]
Abstract
We report the discovery of a self-doped multilayer high Tc superconductor Ba2Ca3Cu4O8F2 (F0234) which contains distinctly different superconducting gap magnitudes along its two Fermi-surface sheets. While formal valence counting would imply this material to be an undoped insulator, it is a self-doped superconductor with a Tc of 60 K, possessing simultaneously both electron- and hole-doped Fermi-surface sheets. Intriguingly, the Fermi-surface sheet characterized by the much larger gap is the electron-doped one, which has a shape disfavoring two electronic features considered to be important for the pairing mechanism: the van Hove singularity and the antiferromagnetic (pi/a, pi/a) scattering.
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Affiliation(s)
- Yulin Chen
- Department of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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20
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Ribeiro TC, Wen XG. Tunneling spectra of layered strongly correlated d-wave superconductors. PHYSICAL REVIEW LETTERS 2006; 97:057003. [PMID: 17026133 DOI: 10.1103/physrevlett.97.057003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2005] [Indexed: 05/12/2023]
Abstract
Tunneling conductance experiments on cuprate superconductors exhibit a large diversity of spectra that appear in different nanosized regions of inhomogeneous samples. In this Letter, we use a mean-field approach to the tt't''J model in order to address the features in these spectra that deviate from the BCS paradigm, namely, the bias sign asymmetry at high bias, the generic lack of evidence for the van Hove singularity, and the absence of coherence peaks at low dopings. We conclude that these features can be reproduced in homogeneous layered d-wave superconductors solely due to a proximate Mott insulating transition. We also establish the connection between the above tunneling spectral features and the strong renormalization of the electron dispersion around (0, pi) and (pi, 0) and the momentum space anisotropy of electronic states observed in angle-resolved photoemission spectroscopy experiments.
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Affiliation(s)
- Tiago C Ribeiro
- Department of Physics, University of California, Berkeley, CA 94720, USA
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21
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Homes CC, Dordevic SV, Gu GD, Li Q, Valla T, Tranquada JM. Charge order, metallic behavior, and superconductivity in La2-xBaxCuO4 with x=1/8. PHYSICAL REVIEW LETTERS 2006; 96:257002. [PMID: 16907335 DOI: 10.1103/physrevlett.96.257002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2005] [Indexed: 05/11/2023]
Abstract
The ab-plane optical properties of a cleaved single crystal of La2-xBaxCuO4 for x=1/8 (Tc approximately =2.4 K) have been measured over a wide frequency and temperature range. The low-frequency conductivity is Drude-like and shows a metallic response with decreasing temperature. However, below approximately =60 K, corresponding to the onset of charge-stripe order, there is a rapid loss of spectral weight below about 40 meV. The behavior is quite different from that typically associated with the pseudogap in the normal state of the cuprates. Instead, the gapping of the normal-state single-particle excitations looks surprisingly similar to that observed in superconducting La2-xSrxCuO4, including the presence of a residual Drude peak with reduced weight.
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Affiliation(s)
- C C Homes
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
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22
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Sugai S, Takayanagi Y, Hayamizu N. Phason and amplitudon in the charge-density-wave phase of one-dimensional charge stripes in La(2-x)Sr(x)CuO4. PHYSICAL REVIEW LETTERS 2006; 96:137003. [PMID: 16712024 DOI: 10.1103/physrevlett.96.137003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2005] [Indexed: 05/09/2023]
Abstract
The present systematic Raman scattering experiments reveal the phason and amplitudon of the charge density wave (CDW) mode in the charge stripes of La(2-x)Sr(x)CuO4. Only about 15% of the electronic density of states condenses into the CDW state. The symmetries of the CDW modes change by the rotation of the stripes at the insulator-metal transition. The energy of the phason is finite at 0.06 < or = x < or = 0.1 and zero at x = 0.035 and 0.115 < or = x < or = 0.135, which suggests that the CDW is commensurate at 0.06 < or = x < or = 0.1 and incommensurate otherwise. The zero-energy phason seems to reduce T(c) at x = 1/8.
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Affiliation(s)
- S Sugai
- Department of Physics, Faculty of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
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23
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Prelovsek P, Zeyher R, Horsch P. Self-localization of composite spin-lattice polarons. PHYSICAL REVIEW LETTERS 2006; 96:086402. [PMID: 16606203 DOI: 10.1103/physrevlett.96.086402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2005] [Indexed: 05/08/2023]
Abstract
Self-localization of holes in the Holstein t-J model is studied in the adiabatic limit using exact diagonalization and the retraceable path approximation. It is shown that the critical electron-phonon coupling lambda c decreases with increasing J and that this behavior is determined mainly by the incoherent rather than by the coherent motion of the hole. The obtained spin correlation functions in the localized region can be understood within a percolation picture where antiferromagnetic order can persist up to a substantial hole doping. These results restrict the possibility of self-localization of holes in lightly doped cuprates.
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Affiliation(s)
- Peter Prelovsek
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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24
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Wilson JA. Structural matters in HTSC: the origin and form of stripe organization and checkerboarding. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2006; 18:R69-R99. [PMID: 21697557 DOI: 10.1088/0953-8984/18/6/r02] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The paper deals with the controversial charge and spin self-organization phenomena in the HTSC cuprates, of which neutron, x-ray, STM and ARPES experiments give complementary, sometimes apparently contradictory glimpses. The examination has been set in the context of the boson-fermion, negative-U understanding of HTSC advocated over many years by the author. Stripe models are developed which are 2-q in nature and diagonal in form. For such a geometry to be compatible with the data rests upon both the spin and charge arrays being face-centred. Various special doping concentrations are closely looked at, in particular p = 0.1836 or 9/49, which is associated with the maximization of the superconducting condensation energy and the termination of the pseudogap regime. The stripe models are dictated by real space organization of the holes, whereas the dispersionless checkerboarding is interpreted in terms of correlation driven collapse of normal Fermi surface behaviour and response functions. The incommensurate spin diffraction below the 'resonance energy' is seen as in no way expressing spin-wave physics or Fermi surface nesting, but is driven by charge and strain (Jahn-Teller) considerations, and it stands virtually without dispersion. The apparent dispersion comes from the downward dispersion of the resonance peak, and the growth of a further incoherent commensurate peak pursuant upon the falling level of charge stripe organization under excitation.
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Affiliation(s)
- John A Wilson
- H H Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK
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25
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Panagopoulos C, Majoros M, Nishizaki T, Iwasaki H. Weak magnetic order in the normal state of the high-Tc superconductor La2-xSrxCuO4. PHYSICAL REVIEW LETTERS 2006; 96:047002. [PMID: 16486873 DOI: 10.1103/physrevlett.96.047002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2005] [Revised: 08/29/2005] [Indexed: 05/06/2023]
Abstract
We report magnetization measurements in the normal state of the high transition temperature (high-Tc) superconductor La2-xSrxCuO4. A magnetic order in the form of hysteresis in the low-field magnetization is observed at temperatures well above Tc. The doping (x) dependence of the onset and strength of this order follows Tc(x) and falls within the pseudogap regime.
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Affiliation(s)
- C Panagopoulos
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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26
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Mannella N, Yang WL, Zhou XJ, Zheng H, Mitchell JF, Zaanen J, Devereaux TP, Nagaosa N, Hussain Z, Shen ZX. Nodal quasiparticle in pseudogapped colossal magnetoresistive manganites. Nature 2005; 438:474-8. [PMID: 16306987 DOI: 10.1038/nature04273] [Citation(s) in RCA: 210] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2005] [Accepted: 09/19/2005] [Indexed: 11/09/2022]
Abstract
A characteristic feature of the copper oxide high-temperature superconductors is the dichotomy between the electronic excitations along the nodal (diagonal) and antinodal (parallel to the Cu-O bonds) directions in momentum space, generally assumed to be linked to the 'd-wave' symmetry of the superconducting state. Angle-resolved photoemission measurements in the superconducting state have revealed a quasiparticle spectrum with a d-wave gap structure that exhibits a maximum along the antinodal direction and vanishes along the nodal direction. Subsequent measurements have shown that, at low doping levels, this gap structure persists even in the high-temperature metallic state, although the nodal points of the superconducting state spread out in finite 'Fermi arcs'. This is the so-called pseudogap phase, and it has been assumed that it is closely linked to the superconducting state, either by assigning it to fluctuating superconductivity or by invoking orders which are natural competitors of d-wave superconductors. Here we report experimental evidence that a very similar pseudogap state with a nodal-antinodal dichotomous character exists in a system that is markedly different from a superconductor: the ferromagnetic metallic groundstate of the colossal magnetoresistive bilayer manganite La1.2Sr1.8Mn2O7. Our findings therefore cast doubt on the assumption that the pseudogap state in the copper oxides and the nodal-antinodal dichotomy are hallmarks of the superconductivity state.
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Affiliation(s)
- N Mannella
- Department of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA.
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27
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Onufrieva F, Pfeuty P. Doping evolution of the electronic properties of hole- and electron-doped high-T(c) cuprates: role of density wave correlations. PHYSICAL REVIEW LETTERS 2005; 95:207003. [PMID: 16384090 DOI: 10.1103/physrevlett.95.207003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2005] [Indexed: 05/05/2023]
Abstract
We show that the presence of two topological quantum critical points (QCP's) in 2D electronic system on a square lattice imposes strong constraints on density-wave (DW) correlations in the high-T(c) cuprates. Electronic properties of the corresponding strongly correlated system are highly reminiscent of the experimental trends in the high-T(c) cuprates. The most interesting results are the existence at low doping of two single-particle gaps different by order of magnitude both increasing towards low doping and of the specific insulating state characterized by a small chemical potential jump.
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Affiliation(s)
- F Onufrieva
- Laboratoire Léon Brillouin, CEA-CNRS, CE Saclay, 91191 Gif-sur-Yvette cedex, France
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28
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Sahrakorpi S, Lindroos M, Markiewicz RS, Bansil A. Evolution of midgap states and residual three dimensionality in La2-xSrxCuO4. PHYSICAL REVIEW LETTERS 2005; 95:157601. [PMID: 16241761 DOI: 10.1103/physrevlett.95.157601] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2005] [Indexed: 05/05/2023]
Abstract
We carry out extensive first-principles doping-dependent computations of angle-resolved photoemission (ARPES) intensities in La2-xSrxCuO4 over a wide range of binding energies. Intercell hopping and the associated three dimensionality, which is usually neglected in discussing cuprate physics, is shown to play a key role in shaping the ARPES spectra. Despite the obvious importance of strong coupling effects (e.g., the presence of a lower Hubbard band coexisting with midgap states in the doped insulator), a number of salient features of the experimental ARPES spectra are captured to a surprising extent when kz dispersion is properly included in the analysis.
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Affiliation(s)
- S Sahrakorpi
- Physics Department, Northeastern University, Boston, Massachusetts 02115, USA
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29
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Zhou XJ, Shi J, Yoshida T, Cuk T, Yang WL, Brouet V, Nakamura J, Mannella N, Komiya S, Ando Y, Zhou F, Ti WX, Xiong JW, Zhao ZX, Sasagawa T, Kakeshita T, Eisaki H, Uchida S, Fujimori A, Zhang Z, Plummer EW, Laughlin RB, Hussain Z, Shen ZX. Multiple bosonic mode coupling in the electron self-energy of (La2-xSrx)CuO4. PHYSICAL REVIEW LETTERS 2005; 95:117001. [PMID: 16197033 DOI: 10.1103/physrevlett.95.117001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2004] [Indexed: 05/04/2023]
Abstract
High resolution angle-resolved photoemission spectroscopy data along the (0,0)-(pi,pi) nodal direction with significantly improved statistics reveal fine structure in the electron self-energy of the underdoped (La2-xSrx)CuO4 samples in the normal state. Fine structure at energies of (40-46) meV and (58-63) meV, and possible fine structure at energies of (23-29) meV and (75-85) meV, have been identified. These observations indicate that, in (La2-xSrx)CuO4, more than one bosonic modes are involved in the coupling with electrons.
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Affiliation(s)
- X J Zhou
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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30
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Gedik N, Langner M, Langer M, Orenstein J, Ono S, Abe Y, Ando Y. Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system. PHYSICAL REVIEW LETTERS 2005; 95:117005. [PMID: 16197037 DOI: 10.1103/physrevlett.95.117005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2005] [Indexed: 05/04/2023]
Abstract
We report time-resolved measurements of the photoinduced change in reflectivity, DeltaR, in the Bi2Sr2Ca(1-y)Dy(y)Cu2O8+delta (BSCCO) system of cuprate superconductors as a function of hole concentration. We find that the kinetics of quasiparticle decay and the sign of DeltaR both change abruptly where the superconducting transition temperature T(c) is maximal. These coincident changes suggest that a sharp transition in quasiparticle dynamics takes place precisely at optimal doping in the BSCCO system.
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Affiliation(s)
- N Gedik
- Physics Department, University of California, Berkeley, Berkeley, California, USA
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31
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Platé M, Mottershead JDF, Elfimov IS, Peets DC, Liang R, Bonn DA, Hardy WN, Chiuzbaian S, Falub M, Shi M, Patthey L, Damascelli A. Fermi surface and quasiparticle excitations of overdoped Tl2Ba2CuO6 + delta. PHYSICAL REVIEW LETTERS 2005; 95:077001. [PMID: 16196815 DOI: 10.1103/physrevlett.95.077001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2004] [Indexed: 05/04/2023]
Abstract
The high-T(c) superconductor Tl(2)Ba(2)CuO(6 + delta) is studied by angle-resolved photoemission spectroscopy. For a very overdoped T(c) = 30 K sample, the Fermi surface consists of a single large hole pocket centered at (pi, pi) and is approaching a topological transition. Although a superconducting gap with d(x(2)-y(2)) symmetry is tentatively identified, the quasiparticle evolution with momentum and binding energy exhibits a marked departure from the behavior observed in under and optimally doped cuprates. The relevance of these findings to scattering, many-body, and quantum-critical phenomena is discussed.
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Affiliation(s)
- M Platé
- Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada
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32
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Ribeiro TC, Wen XG. New mean-field theory of the tt't''J model applied to high-T(c) superconductors. PHYSICAL REVIEW LETTERS 2005; 95:057001. [PMID: 16090908 DOI: 10.1103/physrevlett.95.057001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2004] [Indexed: 05/03/2023]
Abstract
We introduce a new mean-field approach to the tt't''J model that incorporates both electron-like quasiparticle and spinon excitations as suggested by some experiments and numerical studies. It leads to a mean-field phase diagram which is consistent with that of hole and electron doped cuprates. Moreover, it provides a framework to describe the observed evolution of the electron spectral function from the undoped insulator to the overdoped Fermi metal for both hole and electron doping. The theory also provides a new non-BCS mechanism leading to superconductivity.
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Affiliation(s)
- Tiago C Ribeiro
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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33
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McElroy K, Lee DH, Hoffman JE, Lang KM, Lee J, Hudson EW, Eisaki H, Uchida S, Davis JC. Coincidence of checkerboard charge order and antinodal state decoherence in strongly underdoped superconducting Bi2Sr2CaCu2O8 + delta). PHYSICAL REVIEW LETTERS 2005; 94:197005. [PMID: 16090202 DOI: 10.1103/physrevlett.94.197005] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2004] [Indexed: 05/03/2023]
Abstract
The doping dependence of nanoscale electronic structure in superconducting Bi(2)Sr(2)CaCu(2)O(8 + delta) is studied by scanning tunneling microscopy. At all dopings, the low energy density-of-states modulations are analyzed according to a simple model of quasiparticle interference and found to be consistent with Fermi-arc superconductivity. The superconducting coherence peaks, ubiquitous in near-optimal tunneling spectra, are destroyed with strong underdoping and a new spectral type appears. Exclusively in regions exhibiting this new spectrum, we find local "checkerboard" charge ordering of high energy states, with a wave vector of Q = (+/- 2pi/4.5a(0),0); (0, +/- 2pi/4.5a(0)) +/- 15%. Surprisingly, this spatial ordering of high energy states coexists harmoniously with the low energy Bogoliubov quasiparticle states.
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Affiliation(s)
- K McElroy
- Physics Department, University of California, Berkeley, 94720, USA
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34
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Shen KM, Ronning F, Lu DH, Baumberger F, Ingle NJC, Lee WS, Meevasana W, Kohsaka Y, Azuma M, Takano M, Takagi H, Shen ZX. Nodal quasiparticles and antinodal charge ordering in Ca2-xNaxCuO2Cl2. Science 2005; 307:901-4. [PMID: 15705845 DOI: 10.1126/science.1103627] [Citation(s) in RCA: 298] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Understanding the role of competing states in the cuprates is essential for developing a theory for high-temperature superconductivity. We report angle-resolved photoemission spectroscopy experiments which probe the 4a0 x 4a0 charge-ordered state discovered by scanning tunneling microscopy in the lightly doped cuprate superconductor Ca2-xNaxCuO2Cl2. Our measurements reveal a marked dichotomy between the real- and momentum-space probes, for which charge ordering is emphasized in the tunneling measurements and photoemission is most sensitive to excitations near the node of the d-wave superconducting gap. These results emphasize the importance of momentum anisotropy in determining the complex electronic properties of the cuprates and places strong constraints on theoretical models of the charge-ordered state.
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Affiliation(s)
- Kyle M Shen
- Departments of Applied Physics, Physics, and Stanford Synchrotron Laboratory, Stanford University, Stanford, CA 94305, USA
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35
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Luo HG, Xiang T. Superfluid response in electron-doped cuprate superconductors. PHYSICAL REVIEW LETTERS 2005; 94:027001. [PMID: 15698216 DOI: 10.1103/physrevlett.94.027001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2004] [Indexed: 05/24/2023]
Abstract
We propose a weakly coupled two-band model with dx(2)(-y(2)) pairing symmetry to account for the anomalous temperature dependence of superfluid density rho(s) in electron-doped cuprate superconductors. This model gives a unified explanation to the presence of an upward curvature in rho(s) near T(c) and a weak temperature dependence of rho(s) in low temperatures. Our work resolves a discrepancy in the interpretation of different experimental measurements and suggests that the pairing in electron-doped cuprates has predominately dx(2)(-y(2)) symmetry in the whole doping range.
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Affiliation(s)
- H G Luo
- Institute of Theoretical Physics and Interdisciplinary Center of Theoretical Studies, Chinese Academy of Sciences, P. O. Box 2735, Beijing 100080, China
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36
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Shen KM, Ronning F, Lu DH, Lee WS, Ingle NJC, Meevasana W, Baumberger F, Damascelli A, Armitage NP, Miller LL, Kohsaka Y, Azuma M, Takano M, Takagi H, Shen ZX. Missing quasiparticles and the chemical potential puzzle in the doping evolution of the cuprate superconductors. PHYSICAL REVIEW LETTERS 2004; 93:267002. [PMID: 15698008 DOI: 10.1103/physrevlett.93.267002] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2004] [Indexed: 05/24/2023]
Abstract
The evolution of Ca2-xNaxCuO2Cl2 from Mott insulator to superconductor was studied using angle-resolved photoemission spectroscopy. By measuring both the excitations near the Fermi energy as well as nonbonding states, we tracked the doping dependence of the electronic structure and the chemical potential with unprecedented precision. Our work reveals failures in the standard weakly interacting quasiparticle scenario, including the broad line shapes of the insulator and the apparently paradoxical shift of the chemical potential within the Mott gap. To resolve this, we develop a model where the quasiparticle is vanishingly small at half filling and grows upon doping, allowing us to unify properties such as the dispersion and Fermi wave vector with the chemical potential.
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Affiliation(s)
- K M Shen
- Department of Applied Physics, Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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37
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Katanin AA, Kampf AP. Quasiparticle anisotropy and pseudogap formation from the weak-coupling renormalization group point of view. PHYSICAL REVIEW LETTERS 2004; 93:106406. [PMID: 15447431 DOI: 10.1103/physrevlett.93.106406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2003] [Indexed: 05/24/2023]
Abstract
Using the one-loop functional renormalization group technique, we evaluate the self-energy in the weak-coupling regime of the 2D t-t(') Hubbard model. At van Hove (vH) band fillings and at low temperatures, the quasiparticle weight along the Fermi surface (FS) continuously vanishes on approaching the (pi,0) point where the quasiparticle concept is invalid. Away from vH band fillings the quasiparticle peak is formed inside an anisotropic pseudogap and the self-energy has the conventional Fermi-liquid characteristics near the Fermi level. The spectral weight of the quasiparticle features is reduced on parts of the FS between the near vicinity of hot spots and the FS points closest to (pi,0) and (0,pi).
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Affiliation(s)
- A A Katanin
- Institut für Physik, Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universität Augsburg, 86135 Augsburg, Germany
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38
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Hosseini A, Broun DM, Sheehy DE, Davis TP, Franz M, Hardy WN, Liang R, Bonn DA. Survival of the d-wave superconducting state near the edge of antiferromagnetism in the cuprate phase diagram. PHYSICAL REVIEW LETTERS 2004; 93:107003. [PMID: 15447440 DOI: 10.1103/physrevlett.93.107003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2003] [Indexed: 05/24/2023]
Abstract
In the cuprate superconductor YBa2Cu3O6+x, hole doping in the CuO2 layers is controlled by both oxygen content and the degree of oxygen ordering. At the composition YBa2Cu3O6.35, the ordering can occur at room temperature, thereby tuning the hole doping so that the superconducting critical temperature gradually rises from 0 to 20 K. Here we exploit this to study the c-axis penetration depth as a function of temperature and doping. The temperature dependence shows the d-wave superconductor surviving to very low doping, with no sign of another ordered phase interfering with the nodal quasiparticles. The only apparent doping dependence is a smooth decline of superfluid density as T(c) decreases.
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Affiliation(s)
- A Hosseini
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
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39
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Ando Y, Kurita Y, Komiya S, Ono S, Segawa K. Evolution of the Hall coefficient and the peculiar electronic structure of the cuprate superconductors. PHYSICAL REVIEW LETTERS 2004; 92:197001. [PMID: 15169436 DOI: 10.1103/physrevlett.92.197001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2003] [Indexed: 05/24/2023]
Abstract
Although the Hall coefficient R(H) is an informative transport property of metals and semiconductors, its meaning in the cuprate superconductors has been ambiguous because of its unusual characteristics. Here we show that a systematic study of R(H) in La2-xSrxCuO4 single crystals over a wide doping range establishes a qualitative understanding of its peculiar evolution, which turns out to reflect a two-component nature of the electronic structure caused by an unusual development of the Fermi surface recently uncovered by photoemission experiments.
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Affiliation(s)
- Yoichi Ando
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
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40
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Cieplak MZ, Malinowski A, Guha S, Berkowski M. Localization and interaction effects in strongly underdoped La2-xSrxCuO4. PHYSICAL REVIEW LETTERS 2004; 92:187003. [PMID: 15169526 DOI: 10.1103/physrevlett.92.187003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2003] [Revised: 01/08/2004] [Indexed: 05/24/2023]
Abstract
The in-plane magnetoresistance (MR) in La(2-x)SrxCuO4 films with 0.03< x <0.05 has been studied in the temperature range 1.6 to 100 K, and in magnetic fields up to 14 T, parallel and perpendicular to the CuO2 planes. The behavior of the MR is consistent with a predominant influence of interaction effects at high temperatures, switching gradually to a regime dominated by spin scattering at low T. Weak localization effects are absent. A positive orbital MR appears close to the boundary between the antiferromagnetic and the spin-glass phase, suggesting the onset of Maki-Thompson superconducting fluctuations deep inside the insulating phase.
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Affiliation(s)
- Marta Z Cieplak
- Institute of Physics, Polish Academy of Sciences, 02 668 Warsaw, Poland
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41
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Prelovsek P, Sega I, Bonca J. Scaling of the magnetic response in doped antiferromagnets. PHYSICAL REVIEW LETTERS 2004; 92:027002. [PMID: 14753960 DOI: 10.1103/physrevlett.92.027002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2003] [Indexed: 05/24/2023]
Abstract
A theory of the anomalous omega/T scaling of the dynamic magnetic response in cuprates at low doping is presented. It is based on the memory function representation of the dynamical spin susceptibility in a doped antiferromagnet where the damping of the collective mode is constant and large, whereas the equal-time spin correlations saturate at low T. Exact diagonalization results within the t-J model are shown to support assumptions. Consequences, for both the scaling function and the normalization amplitude, are well in agreement with neutron scattering results.
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Affiliation(s)
- P Prelovsek
- J. Stefan Institute, SI-1000 Ljubljana, Slovenia
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42
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Bernevig BA, Laughlin RB, Santiago DI. Magnetic instability in strongly correlated superconductors. PHYSICAL REVIEW LETTERS 2003; 91:147003. [PMID: 14611548 DOI: 10.1103/physrevlett.91.147003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2003] [Indexed: 05/24/2023]
Abstract
Recently, a new phenomenological Hamiltonian has been proposed to describe the superconducting cuprates. This so-called Gossamer Hamiltonian is an apt model for a superconductor with strong on-site Coulomb repulsion between the electrons. It is shown that at half-filling the Gossamer superconductor with strong repulsion is unstable toward an antiferromagnetic insulator. The superconducting state undergoes a quantum phase transition to an antiferromagnetic insulator as one increases the on-site Coulomb repulsion. Near the transition the Gossamer superconductor becomes spectroscopically indistinguishable from the insulator.
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Affiliation(s)
- Bogdan A Bernevig
- Department of Physics, Stanford University, Stanford, California 94305, USA
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Dumm M, Komiya S, Ando Y, Basov DN. Anisotropic electromagnetic response of lightly doped La2-xSrxCuO4 within the CuO2 planes. PHYSICAL REVIEW LETTERS 2003; 91:077004. [PMID: 12935048 DOI: 10.1103/physrevlett.91.077004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2002] [Indexed: 05/24/2023]
Abstract
Using infrared spectroscopy, we show that spin self-organization in untwinned La2-xSrxCuO4 (LSCO) crystals has profound consequences for the dynamical conductivity sigma(omega). The electronic response of CuO2 planes acquires significant anisotropy in the spin ordered state with enhancement of the conductivity along the direction of the diagonal spin stripes by up to a factor of 2. An examination of the anisotropic response indicates that the diagonal spin texture in weakly doped LSCO is also accompanied by the modulation of charge density. The electronic response of the charge stripes is found to be gapless consistent with the hypothesis of the metallic ground state. Our experiments directly show that the striped ordered systems reveal new degrees of freedom not present in ordinary one-dimensional conductors.
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Affiliation(s)
- M Dumm
- Department of Physics, University of California at San Diego, La Jolla, CA 92093-0319, USA.
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