1
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Li XT, Tu SJ, Chaix L, Fawaz C, d'Astuto M, Li X, Yakhou-Harris F, Kummer K, Brookes NB, Garcia-Fernandez M, Zhou KJ, Lin ZF, Yuan J, Jin K, Dean MPM, Liu X. Evolution of the Magnetic Excitations in Electron-Doped La_{2-x}Ce_{x}CuO_{4}. Phys Rev Lett 2024; 132:056002. [PMID: 38364146 DOI: 10.1103/physrevlett.132.056002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 12/12/2023] [Indexed: 02/18/2024]
Abstract
We investigated the high energy spin excitations in electron-doped La_{2-x}Ce_{x}CuO_{4}, a cuprate superconductor, by resonant inelastic x-ray scattering (RIXS) measurements. Efforts were paid to disentangle the paramagnon signal from non-spin-flip spectral weight mixing in the RIXS spectrum at Q_{∥}=(0.6π,0) and (0.9π,0) along the (1 0) direction. Our results show that, for doping level x from 0.07 to 0.185, the variation of the paramagnon excitation energy is marginal. We discuss the implication of our results in connection with the evolution of the electron correlation strength in this system.
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Affiliation(s)
- X T Li
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - S J Tu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - L Chaix
- Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
| | - C Fawaz
- Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
| | - M d'Astuto
- Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
| | - X Li
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - F Yakhou-Harris
- European Synchrotron Radiation Facility (ESRF), B.P. 220, F-38043 Grenoble Cedex, France
| | - K Kummer
- European Synchrotron Radiation Facility (ESRF), B.P. 220, F-38043 Grenoble Cedex, France
| | - N B Brookes
- European Synchrotron Radiation Facility (ESRF), B.P. 220, F-38043 Grenoble Cedex, France
| | | | - Ke-Jin Zhou
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - Z F Lin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - J Yuan
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - K Jin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - M P M Dean
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - X Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
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2
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Silkin VM, Drechsler SL, Efremov DV. Unusual Low-Energy Collective Charge Excitations in High- Tc Cuprate Superconductors. J Phys Chem Lett 2023; 14:8060-8068. [PMID: 37655950 PMCID: PMC10510710 DOI: 10.1021/acs.jpclett.3c01871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 08/14/2023] [Indexed: 09/02/2023]
Abstract
Despite decades of intensive experimental and theoretical efforts, the physics of cuprate high-temperature superconductors in general, and, in particular, their normal state, is still under debate. Here, we report our investigation of low-energy charge excitations in the normal state. We find that the peculiarities of the electronic band structure at low energies have a profound impact on the nature of the intraband collective modes. It gives rise to a new kind of mode with huge intensity and non-Lorentzian spectral function in addition to well-known collective excitations like conventional plasmons and spin fluctuation. We predict two such modes with maximal spectral weight in the nodal and antinodal directions. Additionally, we found a long-living quasi-one-dimensional plasmon becoming an intense soft mode over an extended momentum range along the antinodal direction. These modes might explain some of the resonant inelastic X-ray scattering spectroscopy data.
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Affiliation(s)
- Vyacheslav M. Silkin
- Donostia
International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain
- Departamento
de Polímeros y Materiales Avanzados: Física,
Química y Tecnología, Facultad de Ciencias
Químicas, Universidad del País
Vasco UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain
- IKERBASQUE,
Basque Foundation for Science, 48013 Bilbao, Basque Country, Spain
| | - Stefan-Ludwig Drechsler
- Leibniz
Institute for Solid State and Materials Research IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Dmitry V. Efremov
- Leibniz
Institute for Solid State and Materials Research IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
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3
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Husain AA, Huang EW, Mitrano M, Rak MS, Rubeck SI, Guo X, Yang H, Sow C, Maeno Y, Uchoa B, Chiang TC, Batson PE, Phillips PW, Abbamonte P. Pines' demon observed as a 3D acoustic plasmon in Sr 2RuO 4. Nature 2023; 621:66-70. [PMID: 37558882 PMCID: PMC10482684 DOI: 10.1038/s41586-023-06318-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Accepted: 06/13/2023] [Indexed: 08/11/2023]
Abstract
The characteristic excitation of a metal is its plasmon, which is a quantized collective oscillation of its electron density. In 1956, David Pines predicted that a distinct type of plasmon, dubbed a 'demon', could exist in three-dimensional (3D) metals containing more than one species of charge carrier1. Consisting of out-of-phase movement of electrons in different bands, demons are acoustic, electrically neutral and do not couple to light, so have never been detected in an equilibrium, 3D metal. Nevertheless, demons are believed to be critical for diverse phenomena including phase transitions in mixed-valence semimetals2, optical properties of metal nanoparticles3, soundarons in Weyl semimetals4 and high-temperature superconductivity in, for example, metal hydrides3,5-7. Here, we present evidence for a demon in Sr2RuO4 from momentum-resolved electron energy-loss spectroscopy. Formed of electrons in the β and γ bands, the demon is gapless with critical momentum qc = 0.08 reciprocal lattice units and room-temperature velocity v = (1.065 ± 0.12) × 105 m s-1 that undergoes a 31% renormalization upon cooling to 30 K because of coupling to the particle-hole continuum. The momentum dependence of the intensity of the demon confirms its neutral character. Our study confirms a 67-year old prediction and indicates that demons may be a pervasive feature of multiband metals.
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Affiliation(s)
- Ali A Husain
- Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, IL, USA.
| | - Edwin W Huang
- Department of Physics and Institute for Condensed Matter Theory, University of Illinois, Urbana, IL, USA
| | - Matteo Mitrano
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Melinda S Rak
- Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, IL, USA
| | - Samantha I Rubeck
- Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, IL, USA
| | - Xuefei Guo
- Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, IL, USA
| | - Hongbin Yang
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, USA
| | - Chanchal Sow
- Department of Physics, Kyoto University, Kyoto, Japan
- Department of Physics, Indian Institute of Technology, Kanpur, India
| | - Yoshiteru Maeno
- Department of Physics, Kyoto University, Kyoto, Japan
- Toyota Riken - Kyoto Univ. Research Center (TRiKUC), KUIAS, Kyoto University, Kyoto, Japan
| | - Bruno Uchoa
- Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
| | - Tai C Chiang
- Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, IL, USA
| | - Philip E Batson
- Department of Physics, Rutgers University, Piscataway, NJ, USA
| | - Philip W Phillips
- Department of Physics and Institute for Condensed Matter Theory, University of Illinois, Urbana, IL, USA
| | - Peter Abbamonte
- Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, IL, USA.
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4
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Hepting M, Bejas M, Nag A, Yamase H, Coppola N, Betto D, Falter C, Garcia-Fernandez M, Agrestini S, Zhou KJ, Minola M, Sacco C, Maritato L, Orgiani P, Wei HI, Shen KM, Schlom DG, Galdi A, Greco A, Keimer B. Gapped Collective Charge Excitations and Interlayer Hopping in Cuprate Superconductors. Phys Rev Lett 2022; 129:047001. [PMID: 35938998 DOI: 10.1103/physrevlett.129.047001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 03/29/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
We use resonant inelastic x-ray scattering to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr_{0.9}La_{0.1}CuO_{2}. We detect a plasmon gap of ∼120 meV at the two-dimensional Brillouin zone center, indicating that low-energy plasmons in Sr_{0.9}La_{0.1}CuO_{2} are not strictly acoustic. The plasmon dispersion, including the gap, is accurately captured by layered t-J-V model calculations. A similar analysis performed on recent resonant inelastic x-ray scattering data from other cuprates suggests that the plasmon gap is generic and its size is related to the magnitude of the interlayer hopping t_{z}. Our work signifies the three dimensionality of the charge dynamics in layered cuprates and provides a new method to determine t_{z}.
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Affiliation(s)
- M Hepting
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - M Bejas
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - A Nag
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - H Yamase
- International Center of Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0047, Japan
- Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - N Coppola
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
| | - D Betto
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - C Falter
- Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | | | - S Agrestini
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - Ke-Jin Zhou
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - M Minola
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - C Sacco
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
| | - L Maritato
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano (Salerno), Italy
| | - P Orgiani
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano (Salerno), Italy
- CNR-IOM, TASC Laboratory in Area Science Park, 34139 Trieste, Italy
| | - H I Wei
- LASSP, Department of Physics, Cornell University, Ithaca, New York 14853, USA
| | - K M Shen
- LASSP, Department of Physics, Cornell University, Ithaca, New York 14853, USA
| | - D G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
- Leibniz-Institut für Kristallzüchtung, Max-Born-Straße 2, 12489 Berlin, Germany
| | - A Galdi
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
- Cornell Laboratory for Accelerator Based Sciences and Education, Cornell University, Ithaca, New York 14853, USA
| | - A Greco
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - B Keimer
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
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5
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Zegrodnik M, Biborski A, Fidrysiak M, Spałek J. Superconductivity in the three-band model of cuprates: nodal direction characteristics and influence of intersite interactions. J Phys Condens Matter 2021; 33:415601. [PMID: 33264759 DOI: 10.1088/1361-648x/abcff6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
The three-band Emery model is applied to study the selected principal features of thed-wavesuperconducting phase in the copper-based compounds. The electron-electron correlations are taken into account by the use of the diagrammatic expansion of the Guztwiller wave function (DE-GWF method). The nodal Fermi velocity, Fermi momentum, and effective mass are all determined in the paired state and show relatively good agreement with the available experimental data, as well as with the corresponding single-band calculations. Additionally, the influence of the next-nearest neighbor oxygen-oxygen hopping and intersite Coulomb repulsion terms on the superconducting phase is analyzed.
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Affiliation(s)
- M Zegrodnik
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
| | - A Biborski
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
| | - M Fidrysiak
- Institute of Theoretical Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
| | - J Spałek
- Institute of Theoretical Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
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6
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Bertinshaw J, Mayer S, Dill FU, Suzuki H, Leupold O, Jafari A, Sergueev I, Spiwek M, Said A, Kasman E, Huang X, Keimer B, Gretarsson H. IRIXS Spectrograph: an ultra high-resolution spectrometer for tender RIXS. J Synchrotron Radiat 2021; 28:1184-1192. [PMID: 34212883 PMCID: PMC8284409 DOI: 10.1107/s1600577521003805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 04/08/2021] [Indexed: 06/13/2023]
Abstract
The IRIXS Spectrograph represents a new design of an ultra-high-resolution resonant inelastic X-ray scattering (RIXS) spectrometer that operates at the Ru L3-edge (2840 eV). First proposed in the field of hard X-rays by Shvyd'ko [(2015), Phys. Rev. A, 91, 053817], the X-ray spectrograph uses a combination of laterally graded multilayer mirrors and collimating/dispersing Ge(111) crystals optics in a novel spectral imaging approach to overcome the energy resolution limitation of a traditional Rowland-type spectrometer [Gretarsson et al. (2020), J. Synchrotron Rad. 27, 538-544]. In combination with a dispersionless nested four-bounce high-resolution monochromator design that utilizes Si(111) and Al2O3(110) crystals, an overall energy resolution better than 35 meV full width at half-maximum has been achieved at the Ru L3-edge, in excellent agreement with ray-tracing simulations.
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Affiliation(s)
- Joel Bertinshaw
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - Simon Mayer
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Frank-Uwe Dill
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Hakuto Suzuki
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - Olaf Leupold
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Atefeh Jafari
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Ilya Sergueev
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Manfred Spiwek
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
| | - Ayman Said
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Elina Kasman
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Xianrong Huang
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Bernhard Keimer
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - Hlynur Gretarsson
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
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7
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Singh A, Huang HY, Chu YY, Hua CY, Lin SW, Fung HS, Shiu HW, Chang J, Li JH, Okamoto J, Chiu CC, Chang CH, Wu WB, Perng SY, Chung SC, Kao KY, Yeh SC, Chao HY, Chen JH, Huang DJ, Chen CT. Development of the Soft X-ray AGM-AGS RIXS beamline at the Taiwan Photon Source. J Synchrotron Radiat 2021; 28:977-986. [PMID: 33950006 PMCID: PMC8127366 DOI: 10.1107/s1600577521002897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 03/18/2021] [Indexed: 06/01/2023]
Abstract
We report on the development of a high-resolution and highly efficient beamline for soft X-ray resonant inelastic X-ray scattering (RIXS) located at the Taiwan Photon Source. This beamline adopts an optical design that uses an active grating monochromator (AGM) and an active grating spectrometer (AGS) to implement the energy compensation principle of grating dispersion. Active gratings are utilized to diminish defocus, coma and higher-order aberrations, as well as to decrease the slope errors caused by thermal deformation and optical polishing. The AGS is mounted on a rotatable granite platform to enable momentum-resolved RIXS measurements with scattering angles over a wide range. Several high-precision instruments developed in-house for this beamline are described briefly. The best energy resolution obtained from this AGM-AGS beamline was 12.4 meV at 530 eV, achieving a resolving power of 4.2 × 104, while the bandwidth of the incident soft X-rays was kept at 0.5 eV. To demonstrate the scientific impact of high-resolution RIXS, we present an example of momentum-resolved RIXS measurements on a high-temperature superconducting cuprate, i.e. La2-xSrxCuO4. The measurements reveal the A1g buckling phonons in superconducting cuprates, opening a new opportunity to investigate the coupling between these phonons and charge-density waves.
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Affiliation(s)
- A. Singh
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. Y. Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Y. Y. Chu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C. Y. Hua
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. W. Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. S. Fung
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. W. Shiu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J. Chang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J. H. Li
- Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - J. Okamoto
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C. C. Chiu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C. H. Chang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - W. B. Wu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. Y. Perng
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. C. Chung
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - K. Y. Kao
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. C. Yeh
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - H. Y. Chao
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J. H. Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - D. J. Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
- Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - C. T. Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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8
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Boschini F, Minola M, Sutarto R, Schierle E, Bluschke M, Das S, Yang Y, Michiardi M, Shao YC, Feng X, Ono S, Zhong RD, Schneeloch JA, Gu GD, Weschke E, He F, Chuang YD, Keimer B, Damascelli A, Frano A, da Silva Neto EH. Dynamic electron correlations with charge order wavelength along all directions in the copper oxide plane. Nat Commun 2021; 12:597. [PMID: 33500415 DOI: 10.1038/s41467-020-20824-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 12/21/2020] [Indexed: 11/08/2022] Open
Abstract
In strongly correlated systems the strength of Coulomb interactions between electrons, relative to their kinetic energy, plays a central role in determining their emergent quantum mechanical phases. We perform resonant x-ray scattering on Bi2Sr2CaCu2O8+δ, a prototypical cuprate superconductor, to probe electronic correlations within the CuO2 plane. We discover a dynamic quasi-circular pattern in the x-y scattering plane with a radius that matches the wave vector magnitude of the well-known static charge order. Along with doping- and temperature-dependent measurements, our experiments reveal a picture of charge order competing with superconductivity where short-range domains along x and y can dynamically rotate into any other in-plane direction. This quasi-circular spectrum, a hallmark of Brazovskii-type fluctuations, has immediate consequences to our understanding of rotational and translational symmetry breaking in the cuprates. We discuss how the combination of short- and long-range Coulomb interactions results in an effective non-monotonic potential that may determine the quasi-circular pattern. Knowledge of effective Coulomb interactions is central to understand emergent quantum phases in strongly correlated systems. Here, Boschini et al. report a dynamic quasi-circular spectrum of charge density wave fluctuations in the CuO2 plane of Bi2Sr2CaCu2O8+δ, shedding a light on understanding how Coulomb interactions can lead to rotational and translational symmetry breaking in the cuprates.
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9
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Nag A, Zhu M, Bejas M, Li J, Robarts HC, Yamase H, Petsch AN, Song D, Eisaki H, Walters AC, García-Fernández M, Greco A, Hayden SM, Zhou KJ. Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering. Phys Rev Lett 2020; 125:257002. [PMID: 33416344 DOI: 10.1103/physrevlett.125.257002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 10/18/2020] [Accepted: 11/13/2020] [Indexed: 06/12/2023]
Abstract
High T_{c} superconductors show a rich variety of phases associated with their charge degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons in these layered cuprate superconductors. While charge ordering has been observed for both hole- and electron-doped cuprates, acoustic plasmons have only been found in electron-doped materials. Here, we use resonant inelastic x-ray scattering to observe the presence of acoustic plasmons in two families of hole-doped cuprate superconductors (La_{1.84}Sr_{0.16}CuO_{4} and Bi_{2}Sr_{1.6}La_{0.4}CuO_{6+δ}), crucially completing the picture. Interestingly, in contrast to the quasistatic charge ordering which manifests at both Cu and O sites, the observed acoustic plasmons are predominantly associated with the O sites, revealing a unique dichotomy in the behavior of valence charges in hole-doped cuprates.
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Affiliation(s)
- Abhishek Nag
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - M Zhu
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - Matías Bejas
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - J Li
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H C Robarts
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - Hiroyuki Yamase
- International Center of Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0047, Japan
- Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - A N Petsch
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - D Song
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8560, Japan
| | - H Eisaki
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8560, Japan
| | - A C Walters
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | | | - Andrés Greco
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - S M Hayden
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - Ke-Jin Zhou
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
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10
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Lu H, Gauthier A, Hepting M, Tremsin AS, Reid AH, Kirchmann PS, Shen ZX, Devereaux TP, Shao YC, Feng X, Coslovich G, Hussain Z, Dakovski GL, Chuang YD, Lee WS. Time-resolved RIXS experiment with pulse-by-pulse parallel readout data collection using X-ray free electron laser. Sci Rep 2020; 10:22226. [PMID: 33335197 PMCID: PMC7746750 DOI: 10.1038/s41598-020-79210-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 11/30/2020] [Indexed: 11/21/2022] Open
Abstract
Time-resolved resonant inelastic X-ray scattering (RIXS) is one of the developing techniques enabled by the advent of X-ray free electron laser (FEL). It is important to evaluate how the FEL jitter, which is inherent in the self-amplified spontaneous emission process, influences the RIXS measurement. Here, we use a microchannel plate (MCP) based Timepix soft X-ray detector to conduct a time-resolved RIXS measurement at the Ti L3-edge on a charge-density-wave material TiSe2. The fast parallel Timepix readout and single photon sensitivity enable pulse-by-pulse data acquisition and analysis. Due to the FEL jitter, low detection efficiency of spectrometer, and low quantum yield of RIXS process, we find that less than 2% of the X-ray FEL pulses produce signals, preventing acquiring sufficient data statistics while maintaining temporal and energy resolution in this measurement. These limitations can be mitigated by using future X-ray FELs with high repetition rates, approaching MHz such as the European XFEL in Germany and LCLS-II in the USA, as well as by utilizing advanced detectors, such as the prototype used in this study.
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Affiliation(s)
- H Lu
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - A Gauthier
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - M Hepting
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - A S Tremsin
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, 94720, USA
| | - A H Reid
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - P S Kirchmann
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - Z X Shen
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - T P Devereaux
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA, 94305, USA.,Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Y C Shao
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - X Feng
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - G Coslovich
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Z Hussain
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - G L Dakovski
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Y D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - W S Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
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11
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Bill A, Hizhnyakov V, Kremer RK, Seibold G, Shelkan A, Sherman A. Phase Separation and Pairing Fluctuations in Oxide Materials. Condensed Matter 2020; 5:65. [DOI: 10.3390/condmat5040065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The microscopic mechanism of charge instabilities and the formation of inhomogeneous states in systems with strong electron correlations is investigated. We demonstrate that within a strong coupling expansion the single-band Hubbard model shows an instability towards phase separation and extend the approach also for an analysis of phase separation in the Hubbard-Kanamori hamiltonian as a prototypical multiband model. We study the pairing fluctuations on top of an inhomogeneous stripe state where superconducting correlations in the extended s-wave and d-wave channels correspond to (anti)bound states in the two-particle spectra. Whereas extended s-wave fluctuations are relevant on the scale of the local interaction parameter U, we find that d-wave fluctuations are pronounced in the energy range of the active subband which crosses the Fermi level. As a result, low energy spin and charge fluctuations can transfer the d-wave correlations from the bound states to the low energy quasiparticle bands. Our investigations therefore help to understand the coexistence of stripe correlations and d-wave superconductivity in cuprates.
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12
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Zhou KJ, Matsuyama S, Strocov VN. hv 2-concept breaks the photon-count limit of RIXS instrumentation. J Synchrotron Radiat 2020; 27:1235-1239. [PMID: 32876598 PMCID: PMC7467335 DOI: 10.1107/s1600577520008607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 06/26/2020] [Indexed: 06/11/2023]
Abstract
Upon progressive refinement of energy resolution, the conventional resonant inelastic X-ray scattering (RIXS) instrumentation reaches the limit where the bandwidth of incident photons becomes insufficient to deliver an acceptable photon-count rate. Here it is shown that RIXS spectra as a function of energy loss are essentially invariant to their integration over incident energies within the core-hole lifetime. This fact permits RIXS instrumentation based on the hv2-concept to utilize incident synchrotron radiation over the whole core-hole lifetime window without any compromise on the much finer energy-loss resolution, thereby breaking the photon-count limit.
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Affiliation(s)
- Ke-Jin Zhou
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - Satoshi Matsuyama
- Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, Japan
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13
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Tang CS, Yin X, Zeng S, Wu J, Yang M, Yang P, Diao C, Feng YP, Breese MBH, Chia EEM, Venkatesan T, Chhowalla M, Ariando A, Rusydi A, Wee ATS. Interfacial Oxygen-Driven Charge Localization and Plasmon Excitation in Unconventional Superconductors. Adv Mater 2020; 32:e2000153. [PMID: 32643185 DOI: 10.1002/adma.202000153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 06/09/2020] [Indexed: 06/11/2023]
Abstract
Charge localization is critical to the control of charge dynamics in systems such as perovskite solar cells, organic-, and nanostructure-based photovoltaics. However, the precise control of charge localization via electronic transport or defect engineering is challenging due to the complexity in reaction pathways and environmental factors. Here, charge localization in optimal-doped La1.85 Sr0.15 CuO4 thin-film on SrTiO3 substrate (LSCO/STO) is investigated, and also a high-energy plasmon is observed. Charge localization manifests as a near-infrared mid-gap state in LSCO/STO. This is ascribed to the interfacial hybridization between the Ti3d-orbitals of the substrate and O2p-orbitals of the film. The interfacial effect leads to significant changes in the many-body correlations and local-field effect. The local-field effect results in an inhomogeneous charge distribution, and due to perturbation by an external field, the high polarizability of this nonuniform charge system eventually generates the high-energy plasmon. Transformation of the electronic correlations in LSCO/STO is further demonstrated via temperature-dependent spectral-weight transfer. This study of charge localization in cuprates and interfacial hybridization provides important clues to their electronic structures and superconductive properties.
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Affiliation(s)
- Chi Sin Tang
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 21 Lower Kent Ridge, Singapore, 119077, Singapore
| | - Xinmao Yin
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Shengwei Zeng
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore
| | - Jing Wu
- Institute of Materials Research and Engineering, A∗STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Singapore, 138634, Singapore
| | - Ming Yang
- Institute of Materials Research and Engineering, A∗STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Singapore, 138634, Singapore
| | - Ping Yang
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Caozheng Diao
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Yuan Ping Feng
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
| | - Mark B H Breese
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Elbert E M Chia
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Thirumalai Venkatesan
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 21 Lower Kent Ridge, Singapore, 119077, Singapore
- NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583, Singapore
| | - Manish Chhowalla
- Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK
| | - Ariando Ariando
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 21 Lower Kent Ridge, Singapore, 119077, Singapore
- NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore
| | - Andrivo Rusydi
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 21 Lower Kent Ridge, Singapore, 119077, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Andrew T S Wee
- Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, Singapore, 117551, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 21 Lower Kent Ridge, Singapore, 119077, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore
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14
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Hill J, Campbell S, Carini G, Chen-Wiegart YCK, Chu Y, Fluerasu A, Fukuto M, Idir M, Jakoncic J, Jarrige I, Siddons P, Tanabe T, Yager KG. Future trends in synchrotron science at NSLS-II. J Phys Condens Matter 2020; 32:374008. [PMID: 32568740 DOI: 10.1088/1361-648x/ab7b19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this paper, we summarize briefly some of the future trends in synchrotron science as seen at the National Synchrotron Light Source II, a new, low emittance source recently commissioned at Brookhaven National Laboratory. We touch upon imaging techniques, the study of dynamics, the increasing use of multimodal approaches, the vital importance of data science, and other enabling technologies. Each are presently undergoing a time of rapid change, driving the field of synchrotron science forward at an ever increasing pace. It is truly an exciting time and one in which Roger Cowley, to whom this journal issue is dedicated, would surely be both invigorated by, and at the heart of.
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Affiliation(s)
- John Hill
- National Synchrotron Light Source II (NSLS-II), Brookhaven National Laboratory, Upton, NY, United States of America
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15
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Tang CS, Yin X, Yang M, Wu D, Wu J, Wong LM, Li C, Tong SW, Chang Y, Ouyang F, Feng YP, Wang SJ, Chi D, Breese MBH, Zhang W, Rusydi A, Wee ATS. Anisotropic Collective Charge Excitations in Quasimetallic 2D Transition-Metal Dichalcogenides. Adv Sci (Weinh) 2020; 7:1902726. [PMID: 32440469 PMCID: PMC7237846 DOI: 10.1002/advs.201902726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 02/11/2020] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
The quasimetallic 1T' phase 2D transition-metal dichalcogenides (TMDs) consist of 1D zigzag metal chains stacked periodically along a single axis. This gives rise to its prominent physical properties which promises the onset of novel physical phenomena and applications. Here, the in-plane electronic correlations are explored, and new mid-infrared plasmon excitations in 1T' phase monolayer WSe2 and MoS2 are observed using optical spectroscopies. Based on an extensive first-principles study which analyzes the charge dynamics across multiple axes of the atomic-layered systems, the collective charge excitations are found to disperse only along the direction perpendicular to the chains. Further analysis reveals that the interchain long-range coupling is responsible for the coherent 1D charge dynamics and the spin-orbit coupling affects the plasmon frequency. Detailed investigation of these charge collective modes in 2D-chained systems offers opportunities for novel device applications and has implications for the underlying mechanism that governs superconductivity in 2D TMD systems.
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Affiliation(s)
- Chi Sin Tang
- Department of PhysicsFaculty of ScienceNational University of SingaporeS12 Science Drive 3Singapore117551Singapore
- NUS Graduate School for Integrative Sciences and EngineeringNational University of Singapore21 Lower Kent RidgeSingapore119077Singapore
| | - Xinmao Yin
- Department of PhysicsFaculty of ScienceNational University of SingaporeS12 Science Drive 3Singapore117551Singapore
- Singapore Synchrotron Light Source (SSLS)National University of Singapore5 Research LinkSingapore117603Singapore
| | - Ming Yang
- Institute of Materials Research and Engineering (IMRE)A*STAR (Agency for Science, Technology and Research)2 Fusionopolis Way, InnovisSingapore138634Singapore
| | - Di Wu
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and TechnologyShenzhen UniversityShenzhen518060China
- School of Physics and ElectronicsCentral South UniversityNo. 932, South Lushan RoadChangshaHunan410083China
| | - Jing Wu
- Institute of Materials Research and Engineering (IMRE)A*STAR (Agency for Science, Technology and Research)2 Fusionopolis Way, InnovisSingapore138634Singapore
| | - Lai Mun Wong
- Institute of Materials Research and Engineering (IMRE)A*STAR (Agency for Science, Technology and Research)2 Fusionopolis Way, InnovisSingapore138634Singapore
| | - Changjian Li
- Department of Materials Science & EngineeringNational University of Singapore9 Engineering Drive 1Singapore117575Singapore
| | - Shi Wun Tong
- Institute of Materials Research and Engineering (IMRE)A*STAR (Agency for Science, Technology and Research)2 Fusionopolis Way, InnovisSingapore138634Singapore
| | - Yung‐Huang Chang
- Bachelor Program in Interdisciplinary StudiesNational Yunlin University of Science and Technology123 University Road, Section 3DouliouYunlin64002Taiwan
| | - Fangping Ouyang
- School of Physics and ElectronicsCentral South UniversityNo. 932, South Lushan RoadChangshaHunan410083China
| | - Yuan Ping Feng
- Department of PhysicsFaculty of ScienceNational University of SingaporeS12 Science Drive 3Singapore117551Singapore
| | - Shi Jie Wang
- Institute of Materials Research and Engineering (IMRE)A*STAR (Agency for Science, Technology and Research)2 Fusionopolis Way, InnovisSingapore138634Singapore
| | - Dongzhi Chi
- Institute of Materials Research and Engineering (IMRE)A*STAR (Agency for Science, Technology and Research)2 Fusionopolis Way, InnovisSingapore138634Singapore
| | - Mark B. H. Breese
- Department of PhysicsFaculty of ScienceNational University of SingaporeS12 Science Drive 3Singapore117551Singapore
- Singapore Synchrotron Light Source (SSLS)National University of Singapore5 Research LinkSingapore117603Singapore
| | - Wenjing Zhang
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and TechnologyShenzhen UniversityShenzhen518060China
| | - Andrivo Rusydi
- Department of PhysicsFaculty of ScienceNational University of SingaporeS12 Science Drive 3Singapore117551Singapore
- Singapore Synchrotron Light Source (SSLS)National University of Singapore5 Research LinkSingapore117603Singapore
| | - Andrew T. S. Wee
- Department of PhysicsFaculty of ScienceNational University of SingaporeS12 Science Drive 3Singapore117551Singapore
- NUS Graduate School for Integrative Sciences and EngineeringNational University of Singapore21 Lower Kent RidgeSingapore119077Singapore
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16
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Sarkar T, Wei DS, Zhang J, Poniatowski NR, Mandal PR, Kapitulnik A, Greene RL. Ferromagnetic order beyond the superconducting dome in a cuprate superconductor. Science 2020; 368:532-534. [PMID: 32355032 DOI: 10.1126/science.aax1581] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 10/23/2019] [Accepted: 03/25/2020] [Indexed: 11/02/2022]
Abstract
According to conventional wisdom, the extraordinary properties of the cuprate high-temperature superconductors arise from doping a strongly correlated antiferromagnetic insulator. The highly overdoped cuprates-whose doping lies beyond the dome of superconductivity-are considered to be conventional Fermi liquid metals. We report the emergence of itinerant ferromagnetic order below 4 kelvin for doping beyond the superconducting dome in thin films of electron-doped La2- x Ce x CuO4 (LCCO). The existence of this ferromagnetic order is evidenced by negative, anisotropic, and hysteretic magnetoresistance, hysteretic magnetization, and the polar Kerr effect, all of which are standard signatures of itinerant ferromagnetism in metals. This surprising result suggests that the overdoped cuprates are strongly influenced by electron correlations.
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Affiliation(s)
- Tarapada Sarkar
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - D S Wei
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
| | - J Zhang
- State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
| | - N R Poniatowski
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - P R Mandal
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - A Kapitulnik
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
- Department of Physics, Stanford University, Stanford, CA 94305, USA
- Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Richard L Greene
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA.
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17
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Schulz C, Lieutenant K, Xiao J, Hofmann T, Wong D, Habicht K. Characterization of the soft X-ray spectrometer PEAXIS at BESSY II. J Synchrotron Radiat 2020; 27:238-249. [PMID: 31868758 PMCID: PMC6927519 DOI: 10.1107/s1600577519014887] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 11/04/2019] [Indexed: 06/02/2023]
Abstract
The performance of the recently commissioned spectrometer PEAXIS for resonant inelastic soft X-ray scattering (RIXS) and X-ray photoelectron spectroscopy and its hosting beamline U41-PEAXIS at the BESSY II synchrotron are characterized. The beamline provides linearly polarized light from 180 eV to 1600 eV allowing for RIXS measurements in the range 200-1200 eV. The monochromator optics can be operated in different configurations to provide either high flux with up to 1012 photons s-1 within the focal spot at the sample or high energy resolution with a full width at half maximum of <40 meV at an incident photon energy of ∼400 eV. The measured total energy resolution of the RIXS spectrometer is in very good agreement with theoretically predicted values obtained by ray-tracing simulations. PEAXIS features a 5 m-long RIXS spectrometer arm that can be continuously rotated about the sample position by 106° within the horizontal photon scattering plane, thus enabling the study of momentum-transfer-dependent excitations. Selected scientific examples are presented to demonstrate the instrument capabilities, including measurements of excitations in single-crystalline NiO and in liquid acetone employing a fluid cell sample manipulator. Planned upgrades of the beamline and the RIXS spectrometer to further increase the energy resolution to ∼100 meV at 1000 eV incident photon energy are discussed.
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Affiliation(s)
- Christian Schulz
- Department of Methods for Characterization of Transport Phenomena in Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - Klaus Lieutenant
- Department of Methods for Characterization of Transport Phenomena in Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - Jie Xiao
- Department of Highly Sensitive X-ray Spectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - Tommy Hofmann
- Department of Methods for Characterization of Transport Phenomena in Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - Deniz Wong
- Department of Methods for Characterization of Transport Phenomena in Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
| | - Klaus Habicht
- Department of Methods for Characterization of Transport Phenomena in Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
- Institut für Physik und Astronomie, Universität Potsdam, D-14476 Potsdam, Germany
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18
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Yu Y, Ma L, Cai P, Zhong R, Ye C, Shen J, Gu GD, Chen XH, Zhang Y. High-temperature superconductivity in monolayer Bi 2Sr 2CaCu 2O 8+δ. Nature 2019; 575:156-63. [PMID: 31666697 DOI: 10.1038/s41586-019-1718-x] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 08/23/2019] [Indexed: 11/09/2022]
Abstract
Although copper oxide high-temperature superconductors constitute a complex and diverse material family, they all share a layered lattice structure. This curious fact prompts the question of whether high-temperature superconductivity can exist in an isolated monolayer of copper oxide, and if so, whether the two-dimensional superconductivity and various related phenomena differ from those of their three-dimensional counterparts. The answers may provide insights into the role of dimensionality in high-temperature superconductivity. Here we develop a fabrication process that obtains intrinsic monolayer crystals of the high-temperature superconductor Bi2Sr2CaCu2O8+δ (Bi-2212; here, a monolayer refers to a half unit cell that contains two CuO2 planes). The highest superconducting transition temperature of the monolayer is as high as that of optimally doped bulk. The lack of dimensionality effect on the transition temperature defies expectations from the Mermin-Wagner theorem, in contrast to the much-reduced transition temperature in conventional two-dimensional superconductors such as NbSe2. The properties of monolayer Bi-2212 become extremely tunable; our survey of superconductivity, the pseudogap, charge order and the Mott state at various doping concentrations reveals that the phases are indistinguishable from those in the bulk. Monolayer Bi-2212 therefore displays all the fundamental physics of high-temperature superconductivity. Our results establish monolayer copper oxides as a platform for studying high-temperature superconductivity and other strongly correlated phenomena in two dimensions.
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19
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Huang L, Duan Y, Dai X, Zeng Y, Ma G, Liu Y, Gao S, Zhang W. Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics. Small 2019; 15:e1902730. [PMID: 31402564 DOI: 10.1002/smll.201902730] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 07/27/2019] [Indexed: 05/24/2023]
Abstract
Although various photonic devices inspired by natural materials have been developed, there is no research focusing on multibands adaptability, which is not conducive to the advancement of materials science. Herein, inspired by the moth eye surface model, state-of-the-art hierarchical metamaterials (MMs) used as tunable devices in multispectral electromagnetic-waves (EMWs) frequency range, from microwave to ultraviolet (UV), are designed and prepared. Experimentally, the robust broad bandwidth of microwave absorption greater than 90% (reflection loss (RL) < -10 dB) covering almost entire X and Ku bands (8.04-17.88 GHz) under a deep sub-wavelength thickness (1 mm) is demonstrated. The infrared emissivity is reduced and does not affect the microwave absorption simultaneously, further realizing anti-reflection and camouflage via the strong visible light scattering by the microstructure, and can prevent degradation by reducing the transmittance to less than 10% over the whole near UV band, as well as having hydrophobic abilities. The mechanism explored via simulation model is that topological effects are found in the bio-structure. This discovery points to a pathway for using natural models to overcome physical limits of MMs and has promising prospect in novel photonic materials.
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Affiliation(s)
- Lingxi Huang
- Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, P. R. China
| | - Yuping Duan
- Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, P. R. China
| | - Xuhao Dai
- Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, P. R. China
| | - Yuansong Zeng
- Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, 100024, P. R. China
| | - Guojia Ma
- Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, 100024, P. R. China
| | - Yi Liu
- Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, P. R. China
| | - Shaohua Gao
- ZTE Corporation (Shanxi Province), Xian, 710114, P. R. China
| | - Weiping Zhang
- Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, P. R. China
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Lee WS, Moritz B. Tender X-rays. Nat Mater 2019; 18:537-538. [PMID: 31114065 DOI: 10.1038/s41563-019-0358-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Affiliation(s)
- Wei-Sheng Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
| | - Brian Moritz
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
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