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Putzke C, Guo C, Plisson V, Kroner M, Chervy T, Simoni M, Wevers P, Bachmann MD, Cooper JR, Carrington A, Kikugawa N, Fowlie J, Gariglio S, Mackenzie AP, Burch KS, Îmamoğlu A, Moll PJW. Layered metals as polarized transparent conductors. Nat Commun 2023; 14:3147. [PMID: 37253746 DOI: 10.1038/s41467-023-38848-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 05/17/2023] [Indexed: 06/01/2023] Open
Abstract
The quest to improve transparent conductors balances two key goals: increasing electrical conductivity and increasing optical transparency. To improve both simultaneously is hindered by the physical limitation that good metals with high electrical conductivity have large carrier densities that push the plasma edge into the ultra-violet range. Technological solutions reflect this trade-off, achieving the desired transparencies only by reducing the conductor thickness or carrier density at the expense of a lower conductance. Here we demonstrate that highly anisotropic crystalline conductors offer an alternative solution, avoiding this compromise by separating the directions of conduction and transmission. We demonstrate that slabs of the layered oxides Sr2RuO4 and Tl2Ba2CuO6+δ are optically transparent even at macroscopic thicknesses >2 μm for c-axis polarized light. Underlying this observation is the fabrication of out-of-plane slabs by focused ion beam milling. This work provides a glimpse into future technologies, such as highly polarized and addressable optical screens.
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Affiliation(s)
- Carsten Putzke
- Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, 22761, Germany.
| | - Chunyu Guo
- Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Vincent Plisson
- Department of Physics, Boston College, Chestnut Hill, MA, 02467, USA
| | - Martin Kroner
- Institute of Quantum Electronics, ETH Zurich, CH-8093, Zürich, Switzerland
| | - Thibault Chervy
- Institute of Quantum Electronics, ETH Zurich, CH-8093, Zürich, Switzerland
- NTT Research, Inc., Physics and Informatics Laboratories, 940 Stewart Drive, Sunnyvale, CA, 94085, USA
| | - Matteo Simoni
- Institute of Quantum Electronics, ETH Zurich, CH-8093, Zürich, Switzerland
| | - Pim Wevers
- Institute of Quantum Electronics, ETH Zurich, CH-8093, Zürich, Switzerland
| | - Maja D Bachmann
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
- School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, UK
| | - John R Cooper
- Department of Physics, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, UK
| | - Antony Carrington
- H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
| | - Naoki Kikugawa
- National Institute for Materials Science, Ibaraki, 305-0003, Japan
| | - Jennifer Fowlie
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
| | - Stefano Gariglio
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
| | - Andrew P Mackenzie
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
- School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, UK
| | - Kenneth S Burch
- Department of Physics, Boston College, Chestnut Hill, MA, 02467, USA
| | - Ataç Îmamoğlu
- Institute of Quantum Electronics, ETH Zurich, CH-8093, Zürich, Switzerland
| | - Philip J W Moll
- Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, 22761, Germany.
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2
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Shao Y, Sternbach AJ, Kim BSY, Rikhter AA, Xu X, De Giovannini U, Jing R, Chae SH, Sun Z, Lee SH, Zhu Y, Mao Z, Hone JC, Queiroz R, Millis AJ, Schuck PJ, Rubio A, Fogler MM, Basov DN. Infrared plasmons propagate through a hyperbolic nodal metal. SCIENCE ADVANCES 2022; 8:eadd6169. [PMID: 36288317 PMCID: PMC9604610 DOI: 10.1126/sciadv.add6169] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 09/08/2022] [Indexed: 06/16/2023]
Abstract
Metals are canonical plasmonic media at infrared and optical wavelengths, allowing one to guide and manipulate light at the nanoscale. A special form of optical waveguiding is afforded by highly anisotropic crystals revealing the opposite signs of the dielectric functions along orthogonal directions. These media are classified as hyperbolic and include crystalline insulators, semiconductors, and artificial metamaterials. Layered anisotropic metals are also anticipated to support hyperbolic waveguiding. However, this behavior remains elusive, primarily because interband losses arrest the propagation of infrared modes. Here, we report on the observation of propagating hyperbolic waves in a prototypical layered nodal-line semimetal ZrSiSe. The observed waveguiding originates from polaritonic hybridization between near-infrared light and nodal-line plasmons. Unique nodal electronic structures simultaneously suppress interband loss and boost the plasmonic response, ultimately enabling the propagation of infrared modes through the bulk of the crystal.
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Affiliation(s)
- Yinming Shao
- Department of Physics, Columbia University, New York, NY 10027, USA
| | | | - Brian S. Y. Kim
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Andrey A. Rikhter
- Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA
| | - Xinyi Xu
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Umberto De Giovannini
- Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Hamburg 22761, Germany
- Università degli Studi di Palermo, Dipartimento di Fisica e Chimica Emilio Segrè, via Archirafi 36, I-90123 Palermo, Italy
| | - Ran Jing
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - Sang Hoon Chae
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Zhiyuan Sun
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - Seng Huat Lee
- Department of Physics, Pennsylvania State University, University Park, PA 16802, USA
- 2D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
| | - Yanglin Zhu
- Department of Physics, Pennsylvania State University, University Park, PA 16802, USA
- 2D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
| | - Zhiqiang Mao
- Department of Physics, Pennsylvania State University, University Park, PA 16802, USA
- 2D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
| | - James C. Hone
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Raquel Queiroz
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - Andrew J. Millis
- Department of Physics, Columbia University, New York, NY 10027, USA
- Center for Computational Quantum Physics (CCQ), Flatiron Institute, New York, NY 10010, USA
| | - P. James Schuck
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Angel Rubio
- Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Hamburg 22761, Germany
- Center for Computational Quantum Physics (CCQ), Flatiron Institute, New York, NY 10010, USA
| | - Michael M. Fogler
- Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA
| | - Dmitri N. Basov
- Department of Physics, Columbia University, New York, NY 10027, USA
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3
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Effect of uniaxial strain on structural, electronic and optical properties of Sr2RuO4-xFx: A DFT study. Chem Phys 2021. [DOI: 10.1016/j.chemphys.2021.111132] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Ahn G, Schmehr JL, Porter Z, Wilson SD, Moon SJ. Doping and temperature evolutions of optical response of Sr 3(Ir 1-xRu x) 2O 7. Sci Rep 2020; 10:22340. [PMID: 33339856 PMCID: PMC7749133 DOI: 10.1038/s41598-020-79263-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 12/01/2020] [Indexed: 11/09/2022] Open
Abstract
We report on optical spectroscopic study of the Sr3(Ir1-xRux)2O7 system over a wide doping regime. We find that the changes in the electronic structure occur in the limited range of the concentration of Ru ions where the insulator-metal transition occurs. In the insulating regime, the electronic structure associated with the effective total angular momentum Jeff = 1/2 Mott state remains robust against Ru doping, indicating the localization of the doped holes. Upon entering the metallic regime, the Mott gap collapses and the Drude-like peak with strange metallic character appears. The evolution of the electronic structure registered in the optical data can be explained in terms of a percolative insulator-metal transition. The phonon spectra display anomalous doping evolution of the lineshapes. While the phonon modes of the compounds deep in the insulating and metallic regimes are almost symmetric, those of the semiconducting compound with x = 0.34 in close proximity to the doping-driven insulator-metal transition show a pronounced asymmetry. The temperature evolution of the phonon modes of the x = 0.34 compound reveals the asymmetry is enhanced in the antiferromagnetic state. We discuss roles of the S = 1 spins of the Ru ions and charge excitations for the conspicuous lineshape asymmetry of the x = 0.34 compound.
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Affiliation(s)
- Gihyeon Ahn
- Department of Physics, Hanyang University, Seoul, 04763, Republic of Korea
| | - J L Schmehr
- Materials Department, University of California, Santa Barbara, CA, 93106, USA
| | - Z Porter
- Materials Department, University of California, Santa Barbara, CA, 93106, USA
| | - S D Wilson
- Materials Department, University of California, Santa Barbara, CA, 93106, USA
| | - S J Moon
- Department of Physics, Hanyang University, Seoul, 04763, Republic of Korea. .,Research Institute of Natural Science, Hanyang University, Seoul, 04763, Republic of Korea.
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Dai Z, Hu G, Ou Q, Zhang L, Xia F, Garcia-Vidal FJ, Qiu CW, Bao Q. Artificial Metaphotonics Born Naturally in Two Dimensions. Chem Rev 2020; 120:6197-6246. [DOI: 10.1021/acs.chemrev.9b00592] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Zhigao Dai
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, P.R. China
- Department of Materials Science and Engineering, ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET), Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Guangwei Hu
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
| | - Qingdong Ou
- Department of Materials Science and Engineering, ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET), Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Lei Zhang
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
| | - Fengnian Xia
- Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, United States
| | - Francisco J. Garcia-Vidal
- Departamento de Fisica Teorica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autonoma de Madrid, Madrid 28049, Spain
- Donostia International Physics Center (DIPC), Donostia−San Sebastian E-20018, Spain
| | - Cheng-Wei Qiu
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
| | - Qiaoliang Bao
- Department of Materials Science and Engineering, ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET), Monash University, Wellington Road, Clayton, Victoria 3800, Australia
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6
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Huang HL, Jeng HT. Orbital ordering and magnetism in layered Perovskite Ruthenate Sr 2RuO 4. Sci Rep 2020; 10:7089. [PMID: 32341446 PMCID: PMC7184627 DOI: 10.1038/s41598-020-63415-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 03/31/2020] [Indexed: 11/17/2022] Open
Abstract
Local density approximation plus on-site Coulomb interaction U electronic structure calculations reveal that layered perovskite oxide Sr2RuO4 exhibits the ferromagnetic (FM) half-metallic ground state, which is nearly degenerate with the antiferromagnetic (AFM) phase with a slightly higher total energy. The nearly degenerate FM/AFM total energies provide a reasonable explanation for the experimentally observed spin-fluctuation. In addition, a dumbbell-shape 4d − t2g recombined dxz − dyz orbital ordering on the Ru sublattice is obtained owing to the on-site Coulomb interaction U associated with the elongated RuO6 octahedron local structure. The discovered orbital ordering is robust against the spin-orbit interaction as well as the surface terminations. Our findings unravel the on-site Coulomb correlation as the driving force of the Ru-4d orbital ordering as well as the inherent magnetic degeneracy.
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Affiliation(s)
- Hung-Lung Huang
- Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Horng-Tay Jeng
- Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan. .,Physics Division, National Center for Theoretical Sciences, Hsinchu, 30013, Taiwan. .,Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan.
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7
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Kugler FB, Zingl M, Strand HUR, Lee SSB, von Delft J, Georges A. Strongly Correlated Materials from a Numerical Renormalization Group Perspective: How the Fermi-Liquid State of Sr_{2}RuO_{4} Emerges. PHYSICAL REVIEW LETTERS 2020; 124:016401. [PMID: 31976705 DOI: 10.1103/physrevlett.124.016401] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Indexed: 06/10/2023]
Abstract
The crossover from fluctuating atomic constituents to a collective state as one lowers temperature or energy is at the heart of the dynamical mean-field theory description of the solid state. We demonstrate that the numerical renormalization group is a viable tool to monitor this crossover in a real-materials setting. The renormalization group flow from high to arbitrarily small energy scales clearly reveals the emergence of the Fermi-liquid state of Sr_{2}RuO_{4}. We find a two-stage screening process, where orbital fluctuations are screened at much higher energies than spin fluctuations, and Fermi-liquid behavior, concomitant with spin coherence, below a temperature of 25 K. By computing real-frequency correlation functions, we directly observe this spin-orbital scale separation and show that the van Hove singularity drives strong orbital differentiation. We extract quasiparticle interaction parameters from the low-energy spectrum and find an effective attraction in the spin-triplet sector.
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Affiliation(s)
- Fabian B Kugler
- Arnold Sommerfeld Center for Theoretical Physics, Center for NanoScience, and Munich Center for Quantum Science and Technology, Ludwig-Maximilians-Universität München, 80333 Munich, Germany
| | - Manuel Zingl
- Center for Computational Quantum Physics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA
| | - Hugo U R Strand
- Center for Computational Quantum Physics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA
| | - Seung-Sup B Lee
- Arnold Sommerfeld Center for Theoretical Physics, Center for NanoScience, and Munich Center for Quantum Science and Technology, Ludwig-Maximilians-Universität München, 80333 Munich, Germany
| | - Jan von Delft
- Arnold Sommerfeld Center for Theoretical Physics, Center for NanoScience, and Munich Center for Quantum Science and Technology, Ludwig-Maximilians-Universität München, 80333 Munich, Germany
| | - Antoine Georges
- Center for Computational Quantum Physics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA
- Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
- Centre de Physique Théorique, CNRS, Ecole Polytechnique, IP Paris, 91128 Palaiseau, France
- Department of Quantum Matter Physics, University of Geneva, 1211 Geneva 4, Switzerland
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8
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Acharya S, Laad MS, Dey D, Maitra T, Taraphder A. First-Principles Correlated Approach to the Normal State of Strontium Ruthenate. Sci Rep 2017; 7:43033. [PMID: 28220879 PMCID: PMC5318872 DOI: 10.1038/srep43033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 01/17/2017] [Indexed: 11/12/2022] Open
Abstract
The interplay between multiple bands, sizable multi-band electronic correlations and strong spin-orbit coupling may conspire in selecting a rather unusual unconventional pairing symmetry in layered Sr2RuO4. This mandates a detailed revisit of the normal state and, in particular, the T-dependent incoherence-coherence crossover. Using a modern first-principles correlated view, we study this issue in the actual structure of Sr2RuO4 and present a unified and quantitative description of a range of unusual physical responses in the normal state. Armed with these, we propose that a new and important element, that of dominant multi-orbital charge fluctuations in a Hund's metal, may be a primary pair glue for unconventional superconductivity. Thereby we establish a connection between the normal state responses and superconductivity in this system.
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Affiliation(s)
- S. Acharya
- Department of Physics, Indian Institute of Technology, Kharagpur, Kharagpur 721302, India
- Physics department, Kings College London, WC2R 2LS, UK
| | - M. S. Laad
- Institute of Mathematical Sciences, Taramani, Chennai 600113, India
- Max-Planck Inst. fuer Physik Komplexer Systeme, 38 Noethnitzer Strasse, 01187 Dresden, Germany
| | - Dibyendu Dey
- Department of Physics, Indian Institute of Technology, Kharagpur, Kharagpur 721302, India
| | - T. Maitra
- Department of Physics, Indian Institute of Technology, Roorkee, Roorkee 247667, India
| | - A. Taraphder
- Department of Physics, Indian Institute of Technology, Kharagpur, Kharagpur 721302, India
- Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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9
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Zheng P, Shi YG, Fang AF, Dong T, Yamaura K, Wang NL. The charge carrier localization in the cubic perovskite BaOsO3 revealed by an optical study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:435601. [PMID: 25299070 DOI: 10.1088/0953-8984/26/43/435601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present the optical conductivity spectra for the newly discovered cubic perovskite structure BaOsO3 at various temperatures. The compound exhibits metallic behaviour above 50 K, but becomes non-metallic below 50 K. However, below 550 cm(-1), neither the typical Drude response nor an energy gap is observed in optical conductivity spectra from 300 K to 10 K. A broad peak centred at about 550 cm(-1) is observed in the real part of optical conductivity σ1(ω). The structure could be well reproduced by the localization modified Drude model. The life time of the carrier, deduced from σ1(ω) in terms of the localization modified Drude model, decreases with T varying from 300 K to 100 K, then increases slightly at 10 K. The study indicates that the compound is at the boundary of metal-insulator transition.
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Affiliation(s)
- P Zheng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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10
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Stricker D, Mravlje J, Berthod C, Fittipaldi R, Vecchione A, Georges A, van der Marel D. Optical response of Sr2RuO4 reveals universal fermi-liquid scaling and quasiparticles beyond Landau theory. PHYSICAL REVIEW LETTERS 2014; 113:087404. [PMID: 25192127 DOI: 10.1103/physrevlett.113.087404] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Indexed: 06/03/2023]
Abstract
We report optical measurements demonstrating that the low-energy relaxation rate (1/τ) of the conduction electrons in Sr(2)RuO(4) obeys scaling relations for its frequency (ω) and temperature (T) dependence in accordance with Fermi-liquid theory. In the thermal relaxation regime, 1/τ ∝ (ħω)(2)+(pπk(B)T)(2) with p = 2, and ω/T scaling applies. Many-body electronic structure calculations using dynamical mean-field theory confirm the low-energy Fermi-liquid scaling and provide quantitative understanding of the deviations from Fermi-liquid behavior at higher energy and temperature. The excess optical spectral weight in this regime provides evidence for strongly dispersing "resilient" quasiparticle excitations above the Fermi energy.
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Affiliation(s)
- D Stricker
- Département de Physique de la Matière Condensée, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland
| | - J Mravlje
- Jožef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia
| | - C Berthod
- Département de Physique de la Matière Condensée, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland
| | - R Fittipaldi
- CNR-SPIN, and Dipartimento di Fisica "E. R. Caianiello", Universita di Salerno, I-84084 Fisciano (Salerno) Italy
| | - A Vecchione
- CNR-SPIN, and Dipartimento di Fisica "E. R. Caianiello", Universita di Salerno, I-84084 Fisciano (Salerno) Italy
| | - A Georges
- Département de Physique de la Matière Condensée, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland and Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France and Centre de Physique Théorique, École Polytechnique, CNRS, 91128 Palaiseau, France
| | - D van der Marel
- Département de Physique de la Matière Condensée, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland
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12
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Moon SJ, Homes CC, Akrap A, Xu ZJ, Wen JS, Lin ZW, Li Q, Gu GD, Basov DN. Incoherent c-axis interplane response of the iron chalcogenide FeTe(0.55)Se(0.45) superconductor from infrared spectroscopy. PHYSICAL REVIEW LETTERS 2011; 106:217001. [PMID: 21699329 DOI: 10.1103/physrevlett.106.217001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2010] [Indexed: 05/31/2023]
Abstract
We report on the interplane c-axis electronic response of FeTe(0.55)Se(0.45) investigated by infrared spectroscopy. We find that the normal-state c-axis electronic response of FeTe(0.55)Se(0.45) is incoherent and bears significant similarities to those of mildly underdoped cuprates. The c-axis optical conductivity σ(c)(ω) of FeTe(0.55)Se(0.45) does not display well-defined Drude response at all temperatures. As temperature decreases, σ(c)(ω) is continuously suppressed. The incoherent c-axis response is found to be related to the strong dissipation in the ab-plane transport: a pattern that holds true for various correlated materials as well as FeTe(0.55)Se(0.45).
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Affiliation(s)
- S J Moon
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA.
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13
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Chen ZG, Dong T, Ruan RH, Hu BF, Cheng B, Hu WZ, Zheng P, Fang Z, Dai X, Wang NL. Measurement of the c-axis optical reflectance of AFe2As2 (A=Ba, Sr) single crystals: evidence of different mechanisms for the formation of two energy gaps. PHYSICAL REVIEW LETTERS 2010; 105:097003. [PMID: 20868186 DOI: 10.1103/physrevlett.105.097003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 06/21/2010] [Indexed: 05/29/2023]
Abstract
We present the c-axis optical reflectance measurement on single crystals of BaFe2As2 and SrFe2As2, the parent compounds of FeAs based superconductors. Different from the ab-plane optical response where two distinct energy gaps were observed in the spin-density-wave (SDW) state, only the smaller energy gap could be seen clearly for E∥c axis. The very pronounced energy gap structure seen at a higher energy scale for E∥ab plane is almost invisible. We propose a novel picture for the band structure evolution across the SDW transition and suggest different driving mechanisms for the formation of the two energy gaps.
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Affiliation(s)
- Z G Chen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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14
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Bauer T, Falter C. The phonon dynamics of Sr(2)RuO(4): microscopic calculation and comparison with that of La(2)CuO(4). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:395701. [PMID: 21832396 DOI: 10.1088/0953-8984/21/39/395701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The phonon dynamics of the low-temperature superconductor Sr(2)RuO(4) is calculated quantitatively in linear response theory and compared with that of the structurally isomorphic high-temperature superconductor La(2)CuO(4). Our calculation corrects for a typical deficiency of local density approximation-based calculations, which always predict too large an electronic k(z)-dispersion insufficient for describing the c-axis response of real materials. With a more realistic computation of the electronic band structure, the frequency and wavevector dependent irreducible polarization part of the density response function is determined and used for adiabatic and nonadiabatic phonon calculations. Our analysis for Sr(2)RuO(4) reveals important differences from the lattice dynamics of p- and n-doped cuprates. Consistently with experimental evidence from inelastic neutron scattering, the anomalous doping related softening of the strongly coupling high-frequency oxygen bond-stretching modes which is generic for the cuprate superconductors is largely suppressed or completely absent, respectively, depending on the actual value of the on-site Coulomb repulsion of the Ru 4d orbitals. Also the presence of a characteristic Λ(1) mode in La(2)CuO(4) with a very steep dispersion coupled strongly to the electrons is not found for Sr(2)RuO(4). Moreover, we evaluate the possibility of a phonon-plasmon scenario for Sr(2)RuO(4), which has been shown recently to be realistic for La(2)CuO(4). In contrast to the case for La(2)CuO(4), in Sr(2)RuO(4) the plasmons that are very low lying are overdamped along the c-axis.
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Affiliation(s)
- Thomas Bauer
- Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
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15
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Schmidt M, Lee JS, Grunze M, Kim KH, Schade U. Anisotropy studied by polarization-modulated fourier transform infrared reflection difference microspectroscopy. APPLIED SPECTROSCOPY 2008; 62:171-175. [PMID: 18284792 DOI: 10.1366/000370208783575500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We investigated anisotropic optical behavior in solid-state materials using Fourier transform infrared reflection microspectroscopy in combination with polarization modulation. For a Ca1.8Sr0.2RuO4 crystal with an isotropic optical surface, we found the reflection difference to be very close to zero, independent of the azimuthal angle of the sample. A Ca1.4Sr0.6RuO4 crystal with an anisotropic optical surface, however, exhibited a large anisotropic optical response with a strong angular dependence following a sinusoidal behavior. Furthermore, we examined the spatial distribution of the reflection difference in Bi0.17Ca0.83MnO3+delta using infrared synchrotron radiation and could clearly distinguish microscopic anisotropic domains having different optical axes. These results demonstrate that our experimental scheme can be used as a powerful tool to spectrally and spatially resolve anisotropy of solid-state materials in the mid-infrared region.
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Affiliation(s)
- M Schmidt
- Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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Xia J, Maeno Y, Beyersdorf PT, Fejer MM, Kapitulnik A. High resolution polar Kerr effect measurements of Sr2RuO4: evidence for broken time-reversal symmetry in the superconducting state. PHYSICAL REVIEW LETTERS 2006; 97:167002. [PMID: 17155427 DOI: 10.1103/physrevlett.97.167002] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2006] [Indexed: 05/12/2023]
Abstract
The polar Kerr effect in the spin-triplet superconductor Sr2RuO4 was measured with high precision using a Sagnac interferometer with a zero-area Sagnac loop. We observed nonzero Kerr rotations as big as 65 nanorad appearing below Tc in large domains. Our results imply a broken time-reversal symmetry state in the superconducting state of Sr2RuO4, similar to 3He-A.
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Affiliation(s)
- Jing Xia
- Department of Physics, Stanford University, Stanford, CA 94305, USA
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Wang SC, Yang HB, Sekharan AKP, Ding H, Engelbrecht JR, Dai X, Wang Z, Kaminski A, Valla T, Kidd T, Fedorov AV, Johnson PD. Quasiparticle line shape of Sr2RuO4 and its relation to anisotropic transport. PHYSICAL REVIEW LETTERS 2004; 92:137002. [PMID: 15089639 DOI: 10.1103/physrevlett.92.137002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2003] [Indexed: 05/24/2023]
Abstract
The bulk-representative low-energy spectrum of Sr2RuO4 can be directly measured by angle-resolved photoemission. We find that the quasiparticle spectral line shape of Sr2RuO4 is sensitive to both temperature and momentum. Along the (0,0)-(pi,0) direction, both gamma and beta bands develop a sharp quasiparticle peak near k(F) at low temperatures, but as the temperature increases the spectra quickly lose coherent weight and become broad backgrounds above approximately 130 K, which is the metal-nonmetal crossover temperature, T(M), in the c-axis resistivity. However, spectra along the (0,0)-(pi,pi) direction evolve smoothly across T(M). A simple transport model can describe both in-plane and c-axis resistivity in terms of the quasiparticle line shape. Comparisons are also made to the cuprates, with implications for two dimensionality, magnetic fluctuations, and superconductivity.
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Affiliation(s)
- S-C Wang
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
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Jung JH, Fang Z, He JP, Kaneko Y, Okimoto Y, Tokura Y. Change of electronic structure in Ca2RuO4 induced by orbital ordering. PHYSICAL REVIEW LETTERS 2003; 91:056403. [PMID: 12906613 DOI: 10.1103/physrevlett.91.056403] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2002] [Indexed: 05/18/2023]
Abstract
Optical conductivity spectra sigma(omega) were used to investigate the effect of orbital ordering on the electronic structure of Ca2RuO4. Our LDA+U calculation predicts Ru 4d(xy) ferro-orbital ordering at the ground state, and well explains the present sigma(omega) as well as the reported O 1s x-ray absorption spectra. Variation of temperature (T) causes a large change of spectral weight over several eV as well as collapse of a charge gap accompanied by elongation of the c-axis Ru-O bond length. These results clearly indicate that the d(xy) orbital ordering plays a crucial role in the metal-insulator transition and the T-dependent electronic structure on a large energy scale.
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Affiliation(s)
- J H Jung
- Spin Superstructure Project, ERATO, Japan Science and Technology Corporation (JST), Tsukuba 305-8562, Japan
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Lee JS, Lee YS, Noh TW, Oh SJ, Yu J, Nakatsuji S, Fukazawa H, Maeno Y. Electron and orbital correlations in Ca2-xSrxRuO4 probed by optical spectroscopy. PHYSICAL REVIEW LETTERS 2002; 89:257402. [PMID: 12484916 DOI: 10.1103/physrevlett.89.257402] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2002] [Indexed: 05/24/2023]
Abstract
The optical conductivity spectra of the quasi-two-dimensional Ca2-xSrxRuO4 (0.0< or =x< or =2.0) system were investigated. In the Mott insulating state, two electron correlation-induced peaks were observed about 1.0 and 1.9 eV, which could be explained using the 3-orbital Hubbard model. The low frequency peak showed a shift toward higher frequency as temperature was lowered, indicating that electron-phonon interactions play an important role in the orbital arrangements. From the systematic analysis, it was suggested that the antiferro-orbital and the ferro-orbital ordering states could coexist.
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Affiliation(s)
- J S Lee
- School of Physics and Research Center for Oxide Electronics, Seoul National University, Korea
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Hildebrand MG, Reedyk M, Katsufuji T, Tokura Y. Far-infrared resonance in Sr(2)RuO(4). PHYSICAL REVIEW LETTERS 2001; 87:227002. [PMID: 11736419 DOI: 10.1103/physrevlett.87.227002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2000] [Indexed: 05/23/2023]
Abstract
The far-infrared c-axis reflectance of Sr(2)RuO(4) has been measured above and below the 2.5 K superconducting transition temperature of the sample. A plasma edge develops near 70 cm(-1) as the temperature is lowered, which corresponds to a Drude peak in the real optical conductivity associated with the onset of the coherent motion of the carriers. A gaplike suppression of the frequency-dependent scattering rate at low temperatures indicates that the coherent transport is related to a loss of scattering below 60 cm(-1). A strong resonance near 9 meV is responsible for the scattering that destroys coherence.
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Affiliation(s)
- M G Hildebrand
- Department of Physics, Brock University, St. Catharines, Ontario, Canada L2S 3A1
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Optical Spectroscopic Studies of Metal-Insulator Transitions in Perovskite-Related Oxides. STRUCTURE AND BONDING 2001. [DOI: 10.1007/3-540-45503-5_4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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Yokoya T, Chainani A, Takahashi T, Ding H, Campuzano JC, Katayama-Yoshida H, Kasai M, Tokura Y. Angle-resolved photoemission study of Sr2RuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:13311-13318. [PMID: 9985195 DOI: 10.1103/physrevb.54.13311] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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