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Fan JQ, Yu XQ, Cheng FJ, Wang H, Wang R, Ma X, Hu XP, Zhang D, Ma XC, Xue QK, Song CL. Direct observation of nodeless superconductivity and phonon modes in electron-doped copper oxide Sr1-xNdxCuO2. Natl Sci Rev 2021; 9:nwab225. [PMID: 35530436 PMCID: PMC9070465 DOI: 10.1093/nsr/nwab225] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 12/10/2021] [Accepted: 12/12/2021] [Indexed: 11/14/2022] Open
Abstract
The microscopic understanding of high-temperature superconductivity in cuprates has been hindered by the apparent complexity of crystal structures in these materials. We used scanning tunneling microscopy and spectroscopy to study the electron-doped copper oxide compound Sr1−xNdxCuO2, which has only bare cations separating the CuO2 planes and thus the simplest infinite-layer structure of all cuprate superconductors. Tunneling conductance spectra of the major CuO2 planes in the superconducting state revealed direct evidence for a nodeless pairing gap, regardless of variation of its magnitude with the local doping of trivalent neodymium. Furthermore, three distinct bosonic modes are observed as multiple peak-dip-hump features outside the superconducting gaps and their respective energies depend little on the spatially varying gaps. As well as the bosonic modes, with energies identical to those of the external, bending and stretching phonons of copper oxides, our findings reveal the origin of the bosonic modes in lattice vibrations rather than spin excitations.
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Affiliation(s)
- Jia-Qi Fan
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
| | - Xue-Qing Yu
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
| | - Fang-Jun Cheng
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
| | - Heng Wang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
| | - Ruifeng Wang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
| | - Xiaobing Ma
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
| | - Xiao-Peng Hu
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
| | - Ding Zhang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
- Frontier Science Center for Quantum Information, Beijing100084, China
- Beijing Academy of Quantum Information Sciences, Beijing100193, China
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama351-0198, Japan
| | - Xu-Cun Ma
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
- Frontier Science Center for Quantum Information, Beijing100084, China
| | - Qi-Kun Xue
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
- Frontier Science Center for Quantum Information, Beijing100084, China
- Beijing Academy of Quantum Information Sciences, Beijing100193, China
- Southern University of Science and Technology, Shenzhen518055, China
| | - Can-Li Song
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, China
- Frontier Science Center for Quantum Information, Beijing100084, China
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Terashige T, Ono T, Miyamoto T, Morimoto T, Yamakawa H, Kida N, Ito T, Sasagawa T, Tohyama T, Okamoto H. Doublon-holon pairing mechanism via exchange interaction in two-dimensional cuprate Mott insulators. SCIENCE ADVANCES 2019; 5:eaav2187. [PMID: 31187057 PMCID: PMC6555625 DOI: 10.1126/sciadv.aav2187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 05/02/2019] [Indexed: 06/09/2023]
Abstract
Coupling of charge and spin degrees of freedom is a critical feature of correlated electron oxides, as represented by the spin-related mechanism of a Cooper pair under high-T c superconductivity. A doublon-holon pair generated on an antiferromagnetic spin background is also predicted to attract each other via the spin-spin interaction J, similar to a Cooper pair, while its evidence is difficult to obtain experimentally. Here, we investigate such an excitonic effect by electroreflectance spectroscopy using terahertz electric field pulses in undoped cuprates: Nd2CuO4, Sr2CuO2Cl2, and La2CuO4. Analyses of the spectral changes of reflectivity under electric fields reveal that the splitting of odd-parity and even-parity excitons, a measure of doublon-holon binding energy, increases with J. This trend is reproduced by t-J-type model calculations, providing strong evidence of the spin-related doublon-holon pairing. Agreement with the calculations supports the s-wave symmetry of the doublon-holon pair in contrast to the d-wave Cooper pair in doped cuprates.
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Affiliation(s)
- T. Terashige
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
- AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba 277-8568, Japan
| | - T. Ono
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - T. Miyamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - T. Morimoto
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - H. Yamakawa
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - N. Kida
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - T. Ito
- National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan
| | - T. Sasagawa
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - T. Tohyama
- Department of Applied Physics, Tokyo University of Science, Tokyo 125-8585, Japan
| | - H. Okamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
- AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba 277-8568, Japan
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Abstract
We report on infrared spectroscopy experiments on the electronic response in (Sr1-x La x )2IrO4 (x = 0, 0.021, and 0.067). Our data show that electron doping induced by La substitution leads to an insulator-to-metal transition. The evolution of the electronic structure across the transition reveals the robustness of the strong electronic correlations against the electron doping. The conductivity data of the metallic compound show the signature of the pseudogap that bears close similarity to the analogous studies of the pseudogap in the underdoped cuprates. While the low energy conductivity of the metallic compound is barely frequency dependent, the formation of the pseudogap is revealed by the gradual suppression of the featureless conductivity below a threshold frequency of about 17 meV. The threshold structure develops below about 100 K which is in the vicinity of the onset of the short-range antiferromagnetic order. Our results demonstrate that the electronic correlations play a crucial role in the anomalous charge dynamics in the (Sr1-x La x )2IrO4 system.
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Tajima S. Optical studies of high-temperature superconducting cuprates. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:094001. [PMID: 27472654 DOI: 10.1088/0034-4885/79/9/094001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The optical studies of high-temperature superconducting cuprates (HTSC) are reviewed. From the doping dependence of room temperature spectra, a dramatic change of the electronic state from a Mott (charge transfer) insulator to a Fermi liquid has been revealed. Additionally, the unusual 2D nature of the electronic state has been found. The temperature dependence of the optical spectra provided a rich source of information on the pseudogap, superconducting gap, Josephson plasmon, transverse Josephson plasma mode and precursory superconductivity. Among these issues, Josephson plasmons and transverse Josephson plasma mode were experimentally discovered by optical measurements, and thus are unique to HTSC. The effect of the spin/charge stripe order is also unique to HTSC, reflecting the conducting nature of the stripe order in this system. The pair-breaking due to the stripe order seems stronger in the out-of-plane direction than in the in-plane one.
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Affiliation(s)
- Setsuko Tajima
- Department of Physics, Osaka University, Osaka 560-0043, Japan
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Flora SJS, Mehta A. Monoisoamyl dimercaptosuccinic acid abrogates arsenic-induced developmental toxicity in human embryonic stem cell-derived embryoid bodies: comparison with in vivo studies. Biochem Pharmacol 2009; 78:1340-9. [PMID: 19615344 DOI: 10.1016/j.bcp.2009.07.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2009] [Revised: 07/04/2009] [Accepted: 07/07/2009] [Indexed: 01/02/2023]
Abstract
The ability of human embryonic stem (ES) cells to differentiate into the three germ layers has proposed its application in studying human developmental toxicity in vitro. In the current study we investigated if the prompted application could be utilized to evaluate the efficacy of a newly developed arsenic antidote, monoisoamyl dimercaptosuccinic acid (MiADMSA) against arsenic (III) and if the results obtained in vitro were in concordance with the animal model for studying developmental toxicity. On the basis of real time PCR (qRT-PCR) and cytotoxicity analysis of human embryoid bodies (EBs), we observed that arsenic (III) caused a significant down regulation of gene expression in all the three germ layers, which could be correlated with high mortality, visceral and skeletal defects in pups. Reversal of arsenic-induced dysfunctioning could be observed with concomitant treatment of MiADMSA in vitro and in vivo, indicating ES-EB model could provide toxicity information similar to in vivo model. IR spectroscopy further suggested that MiADMSA bind to arsenic to form adduct, which prevents arsenic from exerting its toxic effect in both models. To our knowledge this study provides first experimental evidence suggesting human ES cells could be utilized in studying the efficacy of drugs in a comparable manner with animal models. We conclude that the ES-EB model seems to be an effective, faster, cost effective method for predicting efficacy of a drug.
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Affiliation(s)
- S J S Flora
- Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road, Gwalior 474 001, India.
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Lupi S, Nicoletti D, Limaj O, Baldassarre L, Ortolani M, Ono S, Ando Y, Calvani P. Far-infrared absorption and the metal-to-insulator transition in hole-doped cuprates. PHYSICAL REVIEW LETTERS 2009; 102:206409. [PMID: 19519052 DOI: 10.1103/physrevlett.102.206409] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Indexed: 05/27/2023]
Abstract
By studying the optical conductivity of Bi(2)Sr(2-x)La(x)CuO(6) and Y(0.97)Ca(0.03)Ba(2)Cu(3)O(6), we show that the metal-to-insulator transition in these hole-doped cuprates is driven by the opening of a small gap at low T in the far infrared. Its width is consistent with the observations of angle-resolved photoemission spectroscopy in other cuprates, along the nodal line of the k space. The gap forms as the Drude term turns into a far-infrared absorption, whose peak frequency can be approximately predicted on the basis of a Mott-like transition. Another band in the midinfrared softens with doping but is less sensitive to the metal-to-insulator transition.
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Affiliation(s)
- S Lupi
- CNR-INFM Coherentia and Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy
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7
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Wang NL, Timusk T, Franck JP, Schweiss P, Braden M, Erb A. Oxygen isotope effect in the ab-plane reflectance of underdoped YBa(2)Cu(3)O(7-delta). PHYSICAL REVIEW LETTERS 2002; 89:087003. [PMID: 12190494 DOI: 10.1103/physrevlett.89.087003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2001] [Indexed: 05/23/2023]
Abstract
We have measured the effect of oxygen isotope substitution on the ab-plane reflectance of underdoped YBa(2)Cu(3)O(7-delta). The frequency shift of the transverse optic phonons due to the substitution of 16O by 18O yields an isotope effect of the expected magnitude for copper-oxygen stretching modes with alpha=0.5+/-0.1. The reflectance shoulder at 400-500 cm(-1) shows a much smaller exponent of alpha=0.1+/-0.1 in the normal state and alpha=0.23+/-0.1 in the superconducting state. These observations suggest that the shoulder is of electronic origin and not due to a phonon mode as has been suggested recently.
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Affiliation(s)
- N L Wang
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
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8
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Homes CC, Vogt T, Shapiro SM, Wakimoto S, Ramirez AP. Optical response of high-dielectric-constant perovskite-related oxide. Science 2001; 293:673-6. [PMID: 11474105 DOI: 10.1126/science.1061655] [Citation(s) in RCA: 232] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Optical conductivity measurements on the perovskite-related oxide CaCu3Ti4O12 provide a hint of the physics underlying the observed giant dielectric effect in this material. A low-frequency vibration displays anomalous behavior, implying that there is a redistribution of charge within the unit cell at low temperature. At infrared frequencies (terahertz), the value for the dielectric constant is approximately 80 at room temperature, which is far smaller than the value of approximately 10(5) obtained at lower radio frequencies (kilohertz). This discrepancy implies the presence of a strong absorption at very low frequencies due to dipole relaxation. At room temperature, the characteristic relaxation times are fast (less than or approximately 500 nanoseconds) but increase dramatically at low temperature, suggesting that the large change in dielectric constant may be due to a relaxor-like dynamical slowing down of dipolar fluctuations in nanosize domains.
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Affiliation(s)
- C C Homes
- Department of Physics, Building 510B, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
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9
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Dulić D, Pimenov A, van der Marel D, Broun DM, Kamal S, Hardy WN, Tsvetkov AA, Sutjaha IM, Liang R, Menovsky AA, Loidl A, Saxena SS. Observation of the transverse optical plasmon in SmLa0.8Sr0.2CuO4-delta. PHYSICAL REVIEW LETTERS 2001; 86:4144-4147. [PMID: 11328116 DOI: 10.1103/physrevlett.86.4144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2000] [Indexed: 05/23/2023]
Abstract
We present microwave and infrared measurements on SmLa0.8Sr0.2CuO4-delta, which are direct evidence for the existence of a transverse optical plasma mode, observed as a peak in the c-axis optical conductivity. This mode appears as a consequence of the existence of two different intrinsic Josephson couplings between the CuO2 layers, one with a Sm2O2 block layer, and the other one with a (La,Sr)2O2-delta block layer. From the frequencies and the intensities of the collective modes we determine the value of the compressibility of the two dimensional electron fluid in the copper oxygen planes.
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Affiliation(s)
- D Dulić
- Laboratory of Solid State Physics, Materials Science Centre, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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10
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Homes CC, McConnell AW, Clayman BP, Bonn DA, Liang R, Hardy WN, Inoue M, Negishi H, Fournier P, Greene RL. Phonon screening in high-temperature superconductors. PHYSICAL REVIEW LETTERS 2000; 84:5391-5394. [PMID: 10990951 DOI: 10.1103/physrevlett.84.5391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/1999] [Revised: 12/28/1999] [Indexed: 05/23/2023]
Abstract
In good conductors optical phonons are usually screened, and therefore not observed. However, sharp features due to infrared-active modes in the copper-oxygen planes are observed in the optical conductivity of Pr1.85Ce0.15CuO4 and YBa2Cu3O6.95. Oscillator strengths indicate that the screening of these modes is poor or totally absent. These materials are compared with eta-Mo4O11, in which lattice modes appear suddenly below the charge-density wave transition. It is proposed that poor screening in the cuprates originates from fluctuating charge inhomogeneities in the copper-oxygen planes.
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Affiliation(s)
- CC Homes
- Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
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11
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Pashkevich YG, Blinkin VA, Gnezdilov VP, Tsapenko VV, Eremenko VV, Lemmens P, Fischer M, Grove M, Guntherodt G, Degiorgi L, Wachter P, Tranquada JM, Buttrey DJ. Stripe conductivity in La1.775Sr0.225NiO4. PHYSICAL REVIEW LETTERS 2000; 84:3919-3922. [PMID: 11019239 DOI: 10.1103/physrevlett.84.3919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/1999] [Indexed: 05/23/2023]
Abstract
We report Raman light-scattering and optical conductivity measurements on a single crystal of La1.775Sr0.225NiO4 which exhibits incommensurate charge-stripe order. The extra phonon peaks induced by stripe order can be understood in terms of the energies of phonons that occur at the charge-order wave vector Q(c). A strong Fano antiresonance for a Ni-O bond-stretching mode provides clear evidence for finite dynamical conductivity within the charge stripes.
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Affiliation(s)
- YG Pashkevich
- A. A. Galkin Donetsk Phystech NASU, 83114 Donetsk, Ukraine
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12
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Shibata H, Yamada T. Superconducting-plasma resonance along the c axis in various copper oxide superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:7500-7504. [PMID: 9984377 DOI: 10.1103/physrevb.54.7500] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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13
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Kim KH, Gu JY, Choi HS, Park GW, Noh TW. Frequency Shifts of the Internal Phonon Modes in La0.7Ca0.3MnO3. PHYSICAL REVIEW LETTERS 1996; 77:1877-1880. [PMID: 10063194 DOI: 10.1103/physrevlett.77.1877] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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14
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Zibold A, Liu HL, Moore SW, Graybeal JM, Tanner DB. Optical properties of single-crystal Sr2CuO2Cl2. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:11734-11743. [PMID: 9982798 DOI: 10.1103/physrevb.53.11734] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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15
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Quijada MA, Tanner DB, Chou FC, Johnston DC, Cheong S. Optical properties of single-crystal La2CuO4+ delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:15485-15503. [PMID: 9980906 DOI: 10.1103/physrevb.52.15485] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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16
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Lorenzana J, Sawatzky GA. Theory of phonon-assisted multimagnon optical absorption and bimagnon states in quantum antiferromagnets. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:9576-9589. [PMID: 9980006 DOI: 10.1103/physrevb.52.9576] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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17
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Koval S, Migoni R. Infrared reflectivity of La2CuO4: Anharmonic shell-model analysis. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:6634-6639. [PMID: 9977197 DOI: 10.1103/physrevb.51.6634] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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18
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Salamon D, Liu R, Klein MV, Karlow MA, Cooper SL, Cheong SW, Lee WC, Ginsberg DM. Large-shift Raman scattering in insulating parent compounds of cuprate superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:6617-6633. [PMID: 9977196 DOI: 10.1103/physrevb.51.6617] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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19
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Polaron formation in superconducting cuprates: Evidence from the infrared reflectivity. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf02462168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Reedyk M, Timusk T, Xue JS, Greedan JE. Anomalous temperature- and doping-induced changes in the c-axis apical-oxygen phonon mode of Pb2Sr2RCu3O8. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:15984-15992. [PMID: 10010735 DOI: 10.1103/physrevb.49.15984] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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22
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Tamasaku K, Ito T, Takagi H, Uchida S. Interplane charge dynamics in La2-xSrxCuO4. PHYSICAL REVIEW LETTERS 1994; 72:3088-3091. [PMID: 10056064 DOI: 10.1103/physrevlett.72.3088] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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23
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McBride JR, Miller LR, Weber WH. Ellipsometric study of the charge-transfer excitation in single-crystal La2CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:12224-12229. [PMID: 10010099 DOI: 10.1103/physrevb.49.12224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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24
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Udagawa M, Nagaoka Y, Ogita N, Masada M, Akimitsu J, Ohbayashi K. Raman-scattering study of R2CuO4 (R=Pr, Nd, Sm, and Gd). PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:585-588. [PMID: 10009320 DOI: 10.1103/physrevb.49.585] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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25
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Falter C, Klenner M, Chen Q. Role of bonding, reduced screening, and structure in the high-temperature superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:16690-16706. [PMID: 10008253 DOI: 10.1103/physrevb.48.16690] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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26
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Laguna MA, Sanjuán ML, Butera A, Tovar M, Fisk Z, Canfield P. Raman study of T'-phase distortion in R2CuO4 compounds (R=Nd,Sm,Eu,Gd). PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:7565-7569. [PMID: 10006925 DOI: 10.1103/physrevb.48.7565] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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27
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Arima T, Tokura Y, Uchida S. Optical spectra of Pr2-xCexCuO4- delta crystals: Evolution of in-gap states with electron doping. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:6597-6603. [PMID: 10009214 DOI: 10.1103/physrevb.48.6597] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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28
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Thomas GA, Rapkine DH, Cheong SW, Schneemeyer LF. Temperature dependence of doping-induced modes in Cu-O planes. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:11369-11373. [PMID: 10005273 DOI: 10.1103/physrevb.47.11369] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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29
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Licheron M, Gervais F. Ba2-xKxPb1-yBiyO4- delta : Layered oxides with insulating or conducting properties and possible superconducting properties. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:8008-8015. [PMID: 10004810 DOI: 10.1103/physrevb.47.8008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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30
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Gao F, Romero DB, Tanner DB, Talvacchio J, Forrester MG. Infrared properties of epitaxial La2-xSrxCuO4 thin films in the normal and superconducting states. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:1036-1052. [PMID: 10005583 DOI: 10.1103/physrevb.47.1036] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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31
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Yoshida M, Tajima S, Koshizuka N, Tanaka S, Uchida S, Ishibashi S. Optical phonons of Ca1.8Sr0.2CuO3 with the Cu-O chain structure. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:11997-12002. [PMID: 9999336 DOI: 10.1103/physrevb.44.11997] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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