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Evolution of Charge-Lattice Dynamics across the Kuramoto Synchronization Phase Diagram of Quantum Tunneling Polarons in Cuprate Superconductors. CONDENSED MATTER 2021. [DOI: 10.3390/condmat6040052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Because of its sensitivity to the instantaneous structure factor, S(Q,t = 0), Extended X-ray Absorption Fine Structure (EXAFS) is a powerful tool for probing the dynamic structure of condensed matter systems in which the charge and lattice dynamics are coupled. When applied to hole-doped cuprate superconductors, EXAFS has revealed the presence of internal quantum tunneling polarons (IQTPs). An IQTP arises in EXAFS as a two-site distribution for certain Cu–O pairs, which is also duplicated in inelastic scattering but not observed in standard diffraction measurements. The Cu–Sr pair distribution has been found to be highly anharmonic and strongly correlated to both the IQTPs and to superconductivity, as, for example, in YSr2Cu2.75Mo0.25O7.54(Tc=84 K). In order to describe such nontrivial, anharmonic charge-lattice dynamics, we have proposed a model Hamiltonian for a prototype six-atom cluster, in which two Cu-apical-O IQTPs are charge-transfer bridged through Cu atoms by an O atom in the CuO2 plane and are anharmonically coupled via a Sr atom. By applying an exact diagonalization procedure to this cluster, we have verified that our model indeed produces an intricate interplay between charge and lattice dynamics. Then, by using the Kuramoto model for the synchronization of coupled quantum oscillators, we have found a first-order phase transition for the IQTPs into a synchronized, phase-locked phase. Most importantly, we have shown that this transition results specifically from the anharmonicity. Finally, we have provided a phase diagram showing the onset of the phase-locking of IQTPs as a function of the charge-lattice and anharmonic couplings in our model. We have found that the charge, initially confined to the apical oxygens, is partially pumped into the CuO2 plane in the synchronized phase, which suggests a possible connection between the synchronized dynamic structure and high-temperature superconductivity (HTSC) in doped cuprates.
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Extremely Overdoped Superconducting Cuprates via High Pressure Oxygenation Methods. CONDENSED MATTER 2021. [DOI: 10.3390/condmat6040050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Within the cuprate constellation, one fixed star has been the superconducting dome in the quantum phase diagram of transition temperature vs. the excess charge on the Cu in the CuO2-planes, p, resulting from O-doping or cation substitution. However, a more extensive search of the literature shows that the loss of the superconductivity in favor of a normal Fermi liquid on the overdoped side should not be assumed. Many experimental results from cuprates prepared by high-pressure oxygenation show Tc converging to a fixed value or continuing to slowly increase past the upper limit of the dome of p = 0.26–0.27, up to the maximum amounts of excess oxygen corresponding to p values of 0.3 to > 0.6. These reports have been met with disinterest or disregard. Our review shows that dome-breaking trends for Tc are, in fact, the result of careful, accurate experimental work on a large number of compounds. This behavior most likely mandates a revision of the theoretical basis for high-temperature superconductivity. That excess O atoms located in specific, metastable sites in the crystal, attainable only with extreme O chemical activity under HPO conditions, cause such a radical extension of the superconductivity points to a much more substantial role for the lattice in terms of internal chemistry and bonding.
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Debnath D, Malik MZ, Chatterjee A. A semi exact solution for a metallic phase in a Holstein-Hubbard chain at half filling with Gaussian anharmonic phonons. Sci Rep 2021; 11:12305. [PMID: 34112876 PMCID: PMC8192758 DOI: 10.1038/s41598-021-91604-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/27/2021] [Indexed: 12/02/2022] Open
Abstract
The nature of phase transition from an antiferromagnetic SDW polaronic Mott insulator to the paramagnetic bipolaronic CDW Peierls insulator is studied for the half-filled Holstein-Hubbard model in one dimension in the presence of Gaussian phonon anharmonicity. A number of unitary transformations performed in succession on the Hamiltonian followed by a general many-phonon averaging leads to an effective electronic Hamiltonian which is then treated exactly by using the Bethe-Ansatz technique of Lieb and Wu to determine the energy of the ground state of the system. Next using the Mott–Hubbard metallicity condition, local spin-moment calculation, and the concept of quantum entanglement entropy and double occupancy, it is shown that in a plane spanned by the electron–phonon coupling coefficient and onsite Coulomb correlation energy, there exists a window in which the SDW and CDW phases are separated by an intermediate phase that is metallic.
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Affiliation(s)
- Debika Debnath
- School of Physics, University of Hyderabad, Hyderabad, 500046, India
| | - M Zahid Malik
- School of Physics, University of Hyderabad, Hyderabad, 500046, India
| | - Ashok Chatterjee
- School of Physics, University of Hyderabad, Hyderabad, 500046, India.
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Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr 2Cu 2.75Mo 0.25O 7.54 and Sr 2CuO 3.3. Proc Natl Acad Sci U S A 2020; 117:33099-33106. [PMID: 33318194 PMCID: PMC7776783 DOI: 10.1073/pnas.2018336117] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The Cu extended X-ray absorption fine structure of YSr2Cu2.75Mo0.25O7.54 (with superconducting critical temperature, Tc, = 84 K) and Sr2CuO3.3 (Tc = 95 K) through their superconducting transitions demonstrates that the common factor in superconductivity in cuprates, including those prepared by high-pressure oxygenation, is an internal quantum tunneling polaron in its dynamical structure. In addition, Sr2CuO3.3 is the first material to show a concomitant transformation in this structure involving atom displacements >1 Å that would be expected to modify its Fermi surface, which would complicate the transition beyond a purely electronic one consisting of the pairing of electrons of opposite momentum across fixed electronic states. A crucial issue in cuprates is the extent and mechanism of the coupling of the lattice to the electrons and the superconductivity. Here we report Cu K edge extended X-ray absorption fine structure measurements elucidating the internal quantum tunneling polaron (iqtp) component of the dynamical structure in two heavily overdoped superconducting cuprate compounds, tetragonal YSr2Cu2.75Mo0.25O7.54 with superconducting critical temperature, Tc = 84 K and hole density p = 0.3 to 0.5 per planar Cu, and the tetragonal phase of Sr2CuO3.3 with Tc = 95 K and p = 0.6. In YSr2Cu2.75Mo0.25O7.54 changes in the Cu-apical O two-site distribution reflect a sequential renormalization of the double-well potential of this site beginning at Tc, with the energy difference between the two minima increasing by ∼6 meV between Tc and 52 K. Sr2CuO3.3 undergoes a radically larger transformation at Tc, >1-Å displacements of the apical O atoms. The principal feature of the dynamical structure underlying these transformations is the strongly anharmonic oscillation of the apical O atoms in a double-well potential that results in the observation of two distinct O sites whose Cu–O distances indicate different bonding modes and valence-charge distributions. The coupling of the superconductivity to the iqtp that originates in this nonadiabatic coupling between the electrons and lattice demonstrates an important role for the dynamical structure whereby pairing occurs even in a system where displacements of the atoms that are part of the transition are sufficiently large to alter the Fermi surface. The synchronization and dynamic coherence of the iqtps resulting from the strong interactions within a crystal would be expected to influence this process.
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Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2Cu 2.75Mo 0.25O 7.54. Proc Natl Acad Sci U S A 2020; 117:4559-4564. [PMID: 32071213 DOI: 10.1073/pnas.1918704117] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A common characteristic of many "overdoped" cuprates prepared with high-pressure oxygen is T c values ≥ 50 K that often exceed that of optimally doped parent compounds, despite O stoichiometries that place the materials at the edge or outside of the conventional boundary between superconducting and normal Fermi liquid states. X-ray absorption fine-structure (XAFS) measurements at 52 K on samples of high-pressure oxygen (HPO) YSr2Cu2.75Mo0.25O7.54, T c = 84 K show that the Mo is in the (VI) valence in an unusually undistorted octahedral geometry with predominantly Mo neighbors that is consistent with its assigned substitution for Cu in the chain sites of the structure. Perturbations of the Cu environments are minimal, although the Cu X-ray absorption near-edge structure (XANES) differs from that in other cuprates. The primary deviation from the crystal structure is therefore nanophase separation into Mo- and Cu-enriched domains. There are, however, indications that the dynamical attributes of the structure are altered relative to YBa2Cu3O7, including a shift of the Cu-apical O two-site distribution from the chain to the plane Cu sites. Another effect that would influence T c is the possibility of multiple bands at the Fermi surface caused by the presence of the second phase and the lowering of the Fermi level.
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Local structure of Sr 2CuO 3.3, a 95 K cuprate superconductor without CuO 2 planes. Proc Natl Acad Sci U S A 2020; 117:4565-4570. [PMID: 32060125 DOI: 10.1073/pnas.1918890117] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The local structure of the highly "overdoped" 95 K superconductor Sr2CuO3.3 determined by Cu K X-ray absorption fine structure (XAFS) at 62 K in magnetically oriented samples shows that 1) the magnetization is perpendicular to the c axis; 2) at these levels of precision the Cu sublattice is tetragonal in agreement with the crystal structure; the O sublattice has 3) continuous -Cu-O- chains that orient perpendicular to an applied magnetic field; 4) approximately half-filled -Cu-O- chains that orient parallel to this field; 5) a substantial number of apical O vacancies; 6) O ions at some apical positions with expanded Cu-O distances; and 7) interstitial positions that imply highly displaced Sr ions. These results contradict the universally accepted features of cuprates that require intact CuO2 planes, magnetization along the c axis, and a termination of the superconductivity when the excess charge on the CuO2 Cu ions exceeds 0.27. These radical differences in charge and structure demonstrate that this compound constitutes a separate class of Cu-O-based superconductors in which the superconductivity originates in a different, more complicated structural unit than CuO2 planes while retaining exceptionally high transition temperatures.
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Lavanya CU, Sankar IV, Chatterjee A. Metallicity in a Holstein-Hubbard Chain at Half Filling with Gaussian Anharmonicity. Sci Rep 2017; 7:3774. [PMID: 28630434 PMCID: PMC5476603 DOI: 10.1038/s41598-017-03985-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 05/08/2017] [Indexed: 11/29/2022] Open
Abstract
The Holstein-Hubbard model with Gaussian phonon anharmonicity is studied in one-dimension at half filling using a variational method based on a series of canonical transformations. A fairly accurate phonon state is chosen to average the transformed Holstein-Hubbard Hamiltonian to obtain an effective Hubbard model which is then solved using the exact Bethe - ansatz following Lieb and Wu to obtain the ground state energy, the average lattice displacement and the renormalized parameters. The Mott-Hubbard criterion, local spin moment and the von Neumann entropy (which is a measure of quantum entanglement) are calculated to determine the ground state phase diagram which shows that the width of the metallic phase flanked by the SDW and CDW phases increases with increasing anharmonicity at low and moderate values of anharmonicity but eventually saturates when the anharmonicity becomes substantially large.
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Affiliation(s)
- Ch Uma Lavanya
- School of Physics, University of Hyderabad, Central University P. O., Hyderabad, 500046, Telangana, India
| | - I V Sankar
- School of Physics, University of Hyderabad, Central University P. O., Hyderabad, 500046, Telangana, India
| | - Ashok Chatterjee
- School of Physics, University of Hyderabad, Central University P. O., Hyderabad, 500046, Telangana, India.
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Conradson SD, Gilbertson SM, Daifuku SL, Kehl JA, Durakiewicz T, Andersson DA, Bishop AR, Byler DD, Maldonado P, Oppeneer PM, Valdez JA, Neidig ML, Rodriguez G. Possible Demonstration of a Polaronic Bose-Einstein(-Mott) Condensate in UO2(+x) by Ultrafast THz Spectroscopy and Microwave Dissipation. Sci Rep 2015; 5:15278. [PMID: 26472071 PMCID: PMC4607891 DOI: 10.1038/srep15278] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 09/21/2015] [Indexed: 11/23/2022] Open
Abstract
Bose-Einstein condensates (BECs) composed of polarons would be an advance because they would combine coherently charge, spin, and a crystal lattice. Following our earlier report of unique structural and spectroscopic properties, we now identify potentially definitive evidence for polaronic BECs in photo- and chemically doped UO2(+x) on the basis of exceptional coherence in the ultrafast time dependent terahertz absorption and microwave spectroscopy results that show collective behavior including dissipation patterns whose precedents are condensate vortex and defect disorder and condensate excitations. That some of these signatures of coherence in an atom-based system extend to ambient temperature suggests a novel mechanism that could be a synchronized, dynamical, disproportionation excitation, possibly via the solid state analog of a Feshbach resonance that promotes the coherence. Such a mechanism would demonstrate that the use of ultra-low temperatures to establish the BEC energy distribution is a convenience rather than a necessity, with the actual requirement for the particles being in the same state that is not necessarily the ground state attainable by other means. A macroscopic quantum object created by chemical doping that can persist to ambient temperature and resides in a bulk solid would be revolutionary in a number of scientific and technological fields.
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Affiliation(s)
- Steven D Conradson
- Synchrotron Soleil, L'Orme des Merisiers Saint-Aubin, BP 48 91192, Gif-sur-Yvette, France
| | | | | | - Jeffrey A Kehl
- Department of Chemistry, University of Rochester, NY 14627, USA
| | - Tomasz Durakiewicz
- Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
| | - David A Andersson
- Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
| | - Alan R Bishop
- Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
| | - Darrin D Byler
- Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
| | - Pablo Maldonado
- Department of Physics and Astronomy, Uppsala University, S-75120, Uppsala, Sweden
| | - Peter M Oppeneer
- Department of Physics and Astronomy, Uppsala University, S-75120, Uppsala, Sweden
| | - James A Valdez
- Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
| | | | - George Rodriguez
- Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
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Bianconi A, Lusignoli M, Saini NL, Bordet P, Radaelli PG. Stripe structure of the CuO2 plane in Bi2Sr2CaCu2O8+y by anomalous x-ray diffraction. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:4310-4314. [PMID: 9986336 DOI: 10.1103/physrevb.54.4310] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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10
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Grigelionis G, Tornau EE, Rosengren A. Effect of an electric field on oxygen ordering and superconducting temperature of YBa2Cu3O6+x thin films. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:425-430. [PMID: 9981994 DOI: 10.1103/physrevb.53.425] [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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11
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Chen X, Liang J, Wang Y, Wu F, Rao G. Superconductivity in Y0.6Pr0.4Ba2-xSrxCu3O7- delta : The role of apical oxygen in hybridization. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:16444-16447. [PMID: 9978638 DOI: 10.1103/physrevb.51.16444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Salkola MI, Bishop AR, Trugman SA. Correlation-function analysis of nonlinear and nonadiabatic systems: Polaron tunneling. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:8878-8891. [PMID: 9977525 DOI: 10.1103/physrevb.51.8878] [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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13
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Bussmann-Holder A, Bishop AR. Anharmonic electron and phonon effects in the c-axis infrared conductivity of high-Tc oxides. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:3246-3249. [PMID: 9979119 DOI: 10.1103/physrevb.51.3246] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ham KM, Sooryakumar R, Takeuchi I, Trajanovic Z, Kwon C, Li Q, Venkatesan T. Raman-active phonons in thin a- and c-axis-oriented (YBa2Cu3O7)m(PrBa2Cu3O7)n superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:16598-16605. [PMID: 9976048 DOI: 10.1103/physrevb.50.16598] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Edwards HL, Barr AL, Markert JT. Modulations in the CuO chain layer of YBa2Cu3O7- delta : Charge density waves? PHYSICAL REVIEW LETTERS 1994; 73:1154-1157. [PMID: 10057638 DOI: 10.1103/physrevlett.73.1154] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Li GG, Conradson SD, Lovato MV, Subramanian MA. Local distortions of the Tl-O layers in Tl-based high-temperature superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:3356-3362. [PMID: 9976589 DOI: 10.1103/physrevb.50.3356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Chandrasekhar N, Valls OT, Goldman AM. Charging effects observed in YBa2Cu3O7-x films: Influence of oxygen ordering. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:6220-6227. [PMID: 10011606 DOI: 10.1103/physrevb.49.6220] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Salkola MI, Bishop AR, Trugman SA. Dynamic polaron tunneling in YBa2Cu3O7: Optical response and inelastic neutron scattering. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:3671-3674. [PMID: 10011253 DOI: 10.1103/physrevb.49.3671] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Vanderah TA, Lowe-Ma CK. Crystal-chemical anomalies in nonsuperconducting PrBa2Cu3O7. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf00730378] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ham KM, Sooryakumar R, Kwon C, Li Q, Venkatesan T. Raman study of (YBa2Cu3O7)m(PrBa2Cu3O7)n superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:16744-16750. [PMID: 10008259 DOI: 10.1103/physrevb.48.16744] [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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Chandrasekhar N, Valls OT, Goldman AM. Mechanism for electric field effects observed in YBa2Cu3O7-x films. PHYSICAL REVIEW LETTERS 1993; 71:1079-1082. [PMID: 10055443 DOI: 10.1103/physrevlett.71.1079] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Konior J. Anharmonic polaronic model and high-Tc superconductivity. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:14425-14433. [PMID: 10005793 DOI: 10.1103/physrevb.47.14425] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Mahan GD, Sofo JO. Resistivity and superconductivity from anharmonic phonons. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:8050-8055. [PMID: 10004815 DOI: 10.1103/physrevb.47.8050] [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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Mihailovic D, McCarty KF, Ginley DS. Anharmonic effects and the two-particle continuum in the Raman spectra of YBa2Cu3O6.9, TlBa2CaCu2O7, and Tl2Ba2CaCu2O8. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:8910-8916. [PMID: 10004937 DOI: 10.1103/physrevb.47.8910] [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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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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Nickel JH, Morris DE, Ager JW. Locus of pairing interaction in YBa2Cu3O7 by site-selective oxygen isotope shift: 18O in CuO2 plane layers. PHYSICAL REVIEW LETTERS 1993; 70:81-84. [PMID: 10053263 DOI: 10.1103/physrevlett.70.81] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Mook HA, Chakoumakos BC, Mostoller M, Boothroyd AT, Paul DM. Phonons and superconductivity in Bi2Sr2CaCu2O8. PHYSICAL REVIEW LETTERS 1992; 69:2272-2275. [PMID: 10046442 DOI: 10.1103/physrevlett.69.2272] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Koyama Y, Nakamura S, Inoue Y, Ohno T. Direct observation of a structural-fluctuation enhancement in a superconducting state of Tl2Ba2Ca2Cu3O10 by electron diffraction. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:5757-5759. [PMID: 10004372 DOI: 10.1103/physrevb.46.5757] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Batistic I, Bishop AR, Conradson SD, Trugman SA. Polaron origin for anharmonicity of the axial oxygen in YBa2Cu3O7. PHYSICAL REVIEW LETTERS 1992; 68:3236-3239. [PMID: 10045648 DOI: 10.1103/physrevlett.68.3236] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Conradson SD, Batistic I, Bishop AR, Raistrick ID, Aronson MC, Garzon FH. Axial oxygen-centered lattice instabilities in YBa2Cu3O7: An application of the analysis of extended x-ray-absorption fine structure in anharmonic systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:2447-2457. [PMID: 10001769 DOI: 10.1103/physrevb.45.2447] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Singh DJ, Papaconstantopoulos DA, Julien JP, Cyrot-Lackmann F. Electronic structure of Ba(Sn,Sb)O3: Absence of superconductivity. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:9519-9523. [PMID: 9998936 DOI: 10.1103/physrevb.44.9519] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Morris DE, Markelz AG, Wei JY, Hultgren CT, Nickel JH, Hamilton JC, McCarty KF. Site-selective oxygen-isotope substitution in YBa2Cu3O7- delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:9556-9561. [PMID: 9998941 DOI: 10.1103/physrevb.44.9556] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zeyher R. Superconductivity-induced dynamic and static changes in q. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:9596-9604. [PMID: 9998944 DOI: 10.1103/physrevb.44.9596] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Allen PG, Conradson SD, Bishop AR. Characterization of a split axial-oxygen site in TlBa2Ca3Cu4O11 by extended x-ray-absorption fine-structure spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:9480-9485. [PMID: 9998930 DOI: 10.1103/physrevb.44.9480] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Zoli M. Apex-oxygen-atom tunneling as source of anomalous low-temperature specific heat in high-Tc superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:7163-7166. [PMID: 9998624 DOI: 10.1103/physrevb.44.7163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Conradson SD, Batistic I, Bishop AR. Correlation between axial-oxygen anharmonicity and Tc in YBa2Cu3O7 and related compounds. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:2422-2425. [PMID: 9999809 DOI: 10.1103/physrevb.44.2422] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ching WY, Zhao GL, Xu YN, Wong KW. Orbital-resolved partial density of states in YBa2Cu3O7. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:6159-6162. [PMID: 9998026 DOI: 10.1103/physrevb.43.6159] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mook HA, Mostoller M, Harvey JA, Hill NW, Chakoumakos BC, Sales BC. Observation of phonon softening at the superconducting transition in Bi2Sr2CaCu2O8. PHYSICAL REVIEW LETTERS 1990; 65:2712-2715. [PMID: 10042673 DOI: 10.1103/physrevlett.65.2712] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Conradson SD, Batistic I, Bishop AR. Evidence for an axial oxygen-centered lattice fluctuation associated with the superconducting transition in YBa2Cu3O7. PHYSICAL REVIEW LETTERS 1990; 65:1675-1678. [PMID: 10042330 DOI: 10.1103/physrevlett.65.1675] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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