1
|
Wu J, Bollinger AT, He X, Božović I. Spontaneous breaking of rotational symmetry in copper oxide superconductors. Nature 2017; 547:432-435. [DOI: 10.1038/nature23290] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 06/08/2017] [Indexed: 11/09/2022]
|
2
|
Walmsley P, Fisher IR. Determination of the resistivity anisotropy of orthorhombic materials via transverse resistivity measurements. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:043901. [PMID: 28456271 DOI: 10.1063/1.4978908] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Measurements of the resistivity anisotropy can provide crucial information about the electronic structure and scattering processes in anisotropic and low-dimensional materials, but quantitative measurements by conventional means often suffer very significant systematic errors. Here we describe a novel approach to measuring the resistivity anisotropy of orthorhombic materials, using a single crystal and a single measurement that is derived from a π4 rotation of the measurement frame relative to the crystallographic axes. In this new basis, the transverse resistivity gives a direct measurement of the resistivity anisotropy, which combined with the longitudinal resistivity also gives the in-plane elements of the conventional resistivity tensor via a 5-point contact geometry. This is demonstrated through application to the charge-density wave compound ErTe3, and it is concluded that this method presents a significant improvement on existing techniques, particularly when measuring small anisotropies.
Collapse
Affiliation(s)
- P Walmsley
- Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305-4045, USA
| | - I R Fisher
- Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305-4045, USA
| |
Collapse
|
3
|
Liu Z, Ian H. Numerical studies on antiferromagnetic skyrmions in nanodisks by means of a new quantum simulation approach. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.02.054] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
4
|
Shi X, Logvenov G, Bollinger AT, Božović I, Panagopoulos C, Popović D. Emergence of superconductivity from the dynamically heterogeneous insulating state in La(2-x)Sr(x)CuO4. NATURE MATERIALS 2013; 12:47-51. [PMID: 23160270 DOI: 10.1038/nmat3487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 10/09/2012] [Indexed: 06/01/2023]
Abstract
A central issue for copper oxides is the nature of the insulating ground state at low carrier densities and the emergence of high-temperature superconductivity from that state with doping. Even though this superconductor-insulator transition (SIT) is a zero-temperature transition, measurements are not usually carried out at low temperatures. Here we use magnetoresistance to probe both the insulating state at very low temperatures and the presence of superconducting fluctuations in La(2-x)Sr(x)CuO(4) films, for doping levels that range from the insulator to the superconductor (x = 0.03-0.08). We observe that the charge glass behaviour, characteristic of the insulating state, is suppressed with doping, but it coexists with superconducting fluctuations that emerge already on the insulating side of the SIT. The unexpected quenching of the superconducting fluctuations by the competing charge order at low temperatures provides a new perspective on the mechanism for the SIT.
Collapse
Affiliation(s)
- Xiaoyan Shi
- National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, USA
| | | | | | | | | | | |
Collapse
|
5
|
Raičević I, Popović D, Panagopoulos C, Benfatto L, Silva Neto MB, Choi ES, Sasagawa T. Skyrmions in a doped antiferromagnet. PHYSICAL REVIEW LETTERS 2011; 106:227206. [PMID: 21702631 DOI: 10.1103/physrevlett.106.227206] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Indexed: 05/31/2023]
Abstract
Magnetization and magnetoresistance have been measured in insulating antiferromagnetic La2Cu0.97Li0.03O4 over a wide range of temperatures, magnetic fields, and field orientations. The magnetoresistance step associated with a weak ferromagnetic transition exhibits a striking nonmonotonic temperature dependence, consistent with the presence of Skyrmions.
Collapse
Affiliation(s)
- I Raičević
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | | | | | | | | | | | | |
Collapse
|
6
|
van Zalk M, Brinkman A, Hilgenkamp H. Conductance anisotropy and linear magnetoresistance in La(2 - x)Sr(x)CuO4 thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:205602. [PMID: 21540521 DOI: 10.1088/0953-8984/23/20/205602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have performed a detailed study of conductance anisotropy and magnetoresistance (MR) of La(2 - x)Sr(x)CuO(4) (LSCO) thin films (0.10 < x < 0.25). These two observables are promising for the detection of stripes. Subtle features of the conductance anisotropy are revealed by measuring the transverse resistance R(xy) in zero magnetic field. It is demonstrated that the sign of R(xy) depends on the orientation of the LSCO Hall bar with respect to the terrace structure of the substrate. Unit-cell-high substrate step edges must therefore be a dominant nucleation source for antiphase boundaries during film growth. We show that the measurement of R(xy) is sensitive enough to detect the cubic-tetragonal phase transition of the SrTiO(3)(100) (STO) substrate at 105 K. The MR of LSCO thin films shows for 0.10 < x < 0.25 a non-monotonic temperature dependence, resulting from the onset of a linear term in the MR above 90 K. We show that the linear MR scales with the Hall resistivity as [Formula: see text], with the constant of proportionality independent of temperature. Such scaling suggests that the linear MR originates from current distortions induced by structural or electronic inhomogeneities. The possible role of stripes for both the MR and the conductance anisotropy is discussed throughout the paper.
Collapse
Affiliation(s)
- M van Zalk
- Faculty of Science and Technology and MESA + Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
| | | | | |
Collapse
|
7
|
Ding JF, Yin YW, Xie L, Yu QX, Li XG. Spin structure transition in La(1.6-x)Nd(0.4)Sr(x)CuO(4) superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:275701. [PMID: 21399264 DOI: 10.1088/0953-8984/22/27/275701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The field and temperature dependencies of the spin structures in the normal states of La(1.6-x)Nd(0.4)Sr(x)CuO(4) (x = 0.10, 0.12, and 0.15) single crystals have been studied by measuring the magnetoresistance and susceptibility. A negative magnetoresistance appears just below the spin-ordering temperature for the magnetic fields parallel to the CuO(2) plane, which can be attributed to the spin-flop transition of the special spin structure in the normal state of the system. The anisotropic variations of susceptibilities with temperature for all the three specimens can be described in the framework of the crystal-field theory. The well fitted broad peaks of the in-plane susceptibilities χ(ab) for the specimens suggest that the susceptibilities are dominated by Nd(3+), and thus the spin reorientation of Cu(2+) in the CuO(2) plane can not be observed from the study of the susceptibility.
Collapse
Affiliation(s)
- J F Ding
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | | | | | | | | |
Collapse
|
8
|
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]
|
9
|
Raicević I, Jaroszyński J, Popović D, Panagopoulos C, Sasagawa T. Evidence for charge glasslike behavior in lightly doped La2-xSrxCuO4 at low temperatures. PHYSICAL REVIEW LETTERS 2008; 101:177004. [PMID: 18999777 DOI: 10.1103/physrevlett.101.177004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2008] [Indexed: 05/27/2023]
Abstract
A c-axis magnetotransport and resistance noise study in La_(1.97)Sr_(0.03)CuO_(4) reveals clear signatures of glassiness, such as hysteresis, memory, and slow, correlated dynamics, but only at temperatures (T) well below the spin glass transition temperature T_(sg). The results strongly suggest the emergence of charge glassiness, or dynamic charge ordering, as a result of Coulomb interactions.
Collapse
Affiliation(s)
- I Raicević
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
| | | | | | | | | |
Collapse
|
10
|
Wu T, Wang CH, Wu G, Fang DF, Luo JL, Liu GT, Chen XH. Giant anisotropy of the magnetoresistance and the 'spin valve' effect in antiferromagnetic Nd(2-x)Ce(x)CuO(4). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:275226. [PMID: 21694387 DOI: 10.1088/0953-8984/20/27/275226] [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
We have studied anisotropic magnetoresistance (MR) and magnetization with a rotating magnetic field (B) within the CuO(2) plane in lightly doped AF Nd(2-x)Ce(x)CuO(4). A giant anisotropy in the MR is observed at low temperature, below 5 K. The c-axis resistivity can be tuned over about one order of magnitude just by changing the B direction within the CuO(2) plane, and a scaling behavior for the out-of-plane and in-plane MR is found. A 'spin valve' effect is proposed for explaining the giant anisotropy of the out-of-plane MR and the evolution of the scaling parameters with the external field. It is found that the field-induced spin-flop transition of the Nd(3+) layer under high magnetic field is the key to understanding the giant anisotropy. These results suggest that a novel entanglement of charge and spin dominates the underlying physics.
Collapse
Affiliation(s)
- T Wu
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
11
|
McLaughlin AC, Sher F, Attfield JP. Negative lattice expansion from the superconductivity–antiferromagnetism crossover in ruthenium copper oxides. Nature 2005; 436:829-32. [PMID: 16094364 DOI: 10.1038/nature03828] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2004] [Accepted: 05/17/2005] [Indexed: 11/09/2022]
Abstract
The mechanism of high-transition-temperature (high-T(c)) superconductivity in doped copper oxides is an enduring problem. Antiferromagnetism is established as the competing order, but the relationship between the two states in the intervening 'pseudogap' regime has become a central puzzle. The role of the crystal lattice, which is important in conventional superconductors, also remains unclear. Here we report an anomalous increase of the distance between copper oxide planes on cooling, which results in negative thermal volume expansion, for layered ruthenium copper oxides that have been doped to the boundary of antiferromagnetism and superconductivity. We propose that a crossover between these states is driven by spin ordering in the ruthenium oxide layers, revealing a novel mechanism for negative lattice expansion in solids. The differences in volume and lattice strain between the distinct superconducting and antiferromagnetic states can account for the phase segregation phenomena found extensively in low-doped copper oxides, and show that Cooper pair formation is coupled to the lattice. Unusually large variations of resistivity with magnetic field are found in these ruthenium copper oxides at low temperatures through coupling between the ordered Ru and Cu spins.
Collapse
Affiliation(s)
- A C McLaughlin
- Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK
| | | | | |
Collapse
|
12
|
Komiya S, Chen HD, Zhang SC, Ando Y. Magic doping fractions for high-temperature superconductors. PHYSICAL REVIEW LETTERS 2005; 94:207004. [PMID: 16090276 DOI: 10.1103/physrevlett.94.207004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2004] [Indexed: 05/03/2023]
Abstract
We report hole-doping dependence of the in-plane resistivity rho(ab) in a cuprate superconductor La(2-x)Sr(x)CuO4, carefully examined using a series of high-quality single crystals. Our detailed measurements find a tendency towards charge ordering at particular rational hole-doping fractions of 1/16, 3/32, 1/8, and 3/16. This observation appears to suggest a specific form of charge order and is most consistent with the recent theoretical prediction of the checkerboard-type ordering of the Cooper pairs at rational doping fractions x = (2m+1)/2n, with integers m and n.
Collapse
Affiliation(s)
- Seiki Komiya
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
| | | | | | | |
Collapse
|
13
|
Dagan Y, Barr MC, Fisher WM, Beck R, Dhakal T, Biswas A, Greene RL. Origin of the anomalous low temperature upturn in the resistivity of the electron-doped cuprate superconductors. PHYSICAL REVIEW LETTERS 2005; 94:057005. [PMID: 15783682 DOI: 10.1103/physrevlett.94.057005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2004] [Indexed: 05/24/2023]
Abstract
The temperature, doping, and field dependences of the magnetoresistance (MR) in Pr2-xCexCuO4-delta films are reported. We distinguish between orbital MR, found when the magnetic field is applied perpendicular to the ab planes, and the nearly isotropic spin MR. The latter, the major MR effect in the superconducting samples, appears in the region of the doping-temperature phase diagram where drho/dT<0, or an upturn in the resistivity appears. We conclude that the upturn originates from spin scattering processes.
Collapse
Affiliation(s)
- Y Dagan
- Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
| | | | | | | | | | | | | |
Collapse
|
14
|
Luo JL, Wang NL, Liu GT, Wu D, Jing XN, Hu F, Xiang T. Metamagnetic transition in Na 0.85 CoO2 single crystals. PHYSICAL REVIEW LETTERS 2004; 93:187203. [PMID: 15525203 DOI: 10.1103/physrevlett.93.187203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Indexed: 05/24/2023]
Abstract
We report the magnetization, specific heat, and transport measurements of a high quality Na(0.85)CoO2 single crystal in applied magnetic fields up to 14 T. At high temperatures, the system is in a paramagnetic phase. It undergoes a magnetic phase transition below approximately 20 K. For the field H||c, the measurement data of magnetization, specific heat, and magnetoresistance reveal a metamagnetic transition from an antiferromagnetic state to a quasiferromagnetic state at about 8 T at low temperatures. However, no transition is observed in the magnetization measurements up to 14 T for H perpendicular c. The low temperature magnetic phase diagram of Na(0.85)CoO2 is determined.
Collapse
Affiliation(s)
- J L Luo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
| | | | | | | | | | | | | |
Collapse
|
15
|
Sun XF, Segawa K, Ando Y. Metal-to-insulator crossover in YBa2Cu3Oy probed by low-temperature quasiparticle heat transport. PHYSICAL REVIEW LETTERS 2004; 93:107001. [PMID: 15447438 DOI: 10.1103/physrevlett.93.107001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2003] [Indexed: 05/24/2023]
Abstract
It was recently demonstrated that in La2-xSrxCuO4 the magnetic-field (H) dependence of the low-temperature thermal conductivity kappa up to 16 T reflects whether the normal state under high magnetic field is a metal or an insulator. We measure the H dependence of kappa in YBa(2)Cu(3)O(y) (YBCO) at subkelvin temperatures for a wide doping range, and find that at low doping the kappa(H) behavior signifies the change in the ground state in this system as well. Surprisingly, the critical doping is found to be located deeply inside the underdoped region, about the hole doping of 0.07 hole/Cu; this critical doping is apparently related to the stripe correlations as revealed by the in-plane resistivity anisotropy.
Collapse
Affiliation(s)
- X F Sun
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
| | | | | |
Collapse
|
16
|
Gozar A, Dennis BS, Blumberg G, Komiya S, Ando Y. Magnetic order in lightly doped La2-xSrxCuO4. PHYSICAL REVIEW LETTERS 2004; 93:027001. [PMID: 15323941 DOI: 10.1103/physrevlett.93.027001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2003] [Indexed: 05/24/2023]
Abstract
We study long wavelength magnetic excitations in lightly doped La2-xSrxCuO4 (x</=0.03) detwinned crystals. The lowest energy magnetic anisotropy induced gap can be understood in terms of the antisymmetric spin interaction inside the antiferromagnetic (AF) phase. The second magnetic resonance, analyzed in terms of in-plane spin anisotropy, shows unconventional behavior within the AF state; it led to the discovery of collective spin excitations pertaining to a field induced magnetically ordered state. This state persists in a 9 T field to more than 100 K above the Néel temperature in x=0.01.
Collapse
Affiliation(s)
- A Gozar
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
| | | | | | | | | |
Collapse
|
17
|
Lavrov AN, Kang HJ, Kurita Y, Suzuki T, Komiya S, Lynn JW, Lee SH, Dai P, Ando Y. Spin-flop transition and the anisotropic magnetoresistance of Pr(1.3-x)La(0.7)CexCuO4: unexpectedly strong spin-charge coupling in the electron-doped cuprates. PHYSICAL REVIEW LETTERS 2004; 92:227003. [PMID: 15245253 DOI: 10.1103/physrevlett.92.227003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2003] [Indexed: 05/24/2023]
Abstract
We use transport and neutron-scattering measurements to show that a magnetic-field-induced transition from noncollinear to collinear spin arrangement in adjacent CuO2 planes of lightly electron-doped Pr(1.3-x)La(0.7)CexCuO4 (x=0.01) crystals affects significantly both the in-plane and out-of-plane resistivity. In the high-field collinear state, the magnetoresistance (MR) does not saturate but exhibits an intriguing fourfold-symmetric angular dependence, oscillating from being positive at B//[100] to being negative at B//[110]. The observed MR of more than 30% at low temperatures induced by a modest modification of the spin structure indicates an unexpectedly strong spin-charge coupling in electron-doped cuprates.
Collapse
Affiliation(s)
- A N Lavrov
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
18
|
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.
Collapse
Affiliation(s)
- Yoichi Ando
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
| | | | | | | | | |
Collapse
|
19
|
Sun XF, Kurita Y, Suzuki T, Komiya S, Ando Y. Thermal conductivity of Pr1.3-xLa0.7CexCuO4 single crystals and signatures of stripes in an electron-doped cuprate. PHYSICAL REVIEW LETTERS 2004; 92:047001. [PMID: 14995395 DOI: 10.1103/physrevlett.92.047001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2003] [Indexed: 05/24/2023]
Abstract
It was recently demonstrated that the anisotropic phonon heat transport behavior is a good probe of the stripe formation in La(2-x)Sr(x)CuO(4) (LSCO) [Phys. Rev. B 67, 104503 (2003)]]. Using this probe, we examined an electron-doped cuprate Pr(1.3-x)La(0.7)Ce(x)CuO(4) (PLCCO) and found that essentially the same features as those in LSCO are observed. Moreover, the in-plane resistivity rho(ab) of lightly doped PLCCO shows metallic behavior (drho(ab)/dT>0) in the Néel ordered state with a mobility comparable to that in LSCO. It is discussed that these peculiar properties in common with LSCO signify the existence of stripes in electron-doped cuprates.
Collapse
Affiliation(s)
- X F Sun
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
| | | | | | | | | |
Collapse
|
20
|
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.
Collapse
Affiliation(s)
- M Dumm
- Department of Physics, University of California at San Diego, La Jolla, CA 92093-0319, USA.
| | | | | | | |
Collapse
|