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Li H, Zhou X, Parham S, Reber TJ, Berger H, Arnold GB, Dessau DS. Coherent organization of electronic correlations as a mechanism to enhance and stabilize high-T C cuprate superconductivity. Nat Commun 2018; 9:26. [PMID: 29295992 PMCID: PMC5750216 DOI: 10.1038/s41467-017-02422-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Accepted: 11/28/2017] [Indexed: 11/08/2022] Open
Abstract
Strong diffusive or incoherent electronic correlations are the signature of the strange-metal normal state of the cuprate superconductors, with these correlations considered to be undressed or removed in the superconducting state. A critical question is if these correlations are responsible for the high-temperature superconductivity. Here, utilizing a development in the analysis of angle-resolved photoemission data, we show that the strange-metal correlations don't simply disappear in the superconducting state, but are instead converted into a strongly renormalized coherent state, with stronger normal state correlations leading to stronger superconducting state renormalization. This conversion begins well above T C at the onset of superconducting fluctuations and it greatly increases the number of states that can pair. Therefore, there is positive feedback--the superconductive pairing creates the conversion that in turn strengthens the pairing. Although such positive feedback should enhance a conventional pairing mechanism, it could potentially also sustain an electronic pairing mechanism.
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Affiliation(s)
- Haoxiang Li
- Department of Physics, University of Colorado at Boulder, Boulder, CO, 80309, USA.
| | - Xiaoqing Zhou
- Department of Physics, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Stephen Parham
- Department of Physics, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Theodore J Reber
- Department of Physics, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Helmuth Berger
- Institute of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
| | - Gerald B Arnold
- Department of Physics, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Daniel S Dessau
- Department of Physics, University of Colorado at Boulder, Boulder, CO, 80309, USA.
- Center for Experiments on Quantum Materials, University of Colorado at Boulder, Boulder, CO, 80309, USA.
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2
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Fermi arcs vs. Fermi pockets in electron-doped perovskite iridates. Sci Rep 2015; 5:8533. [PMID: 25704850 PMCID: PMC4336940 DOI: 10.1038/srep08533] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 01/23/2015] [Indexed: 11/09/2022] Open
Abstract
We report on an angle resolved photoemission (ARPES) study of bulk electron-doped perovskite iridate, (Sr1−xLax)3Ir2O7. Fermi surface pockets are observed with a total electron count in keeping with that expected from La substitution. Depending on the energy and polarization of the incident photons, these pockets show up in the form of disconnected “Fermi arcs”, reminiscent of those reported recently in surface electron-doped Sr2IrO4. Our observed spectral variation is consistent with the coexistence of an electronic supermodulation with structural distortion in the system.
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Marek J, Munzar D. Origin of the magnetic field induced changes of the transverse plasma mode in the c-axis infrared response of underdoped YBa2Cu3O(7-δ). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:415703. [PMID: 21951994 DOI: 10.1088/0953-8984/23/41/415703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report on results of our theoretical study of magnetic field induced changes of the c-axis infrared response of bilayer cuprate superconductors using the phenomenological multilayer model involving the conductivity of the spacing layers and that of the bilayer units. For H perpendicular to the planes, the local conductivities have been expressed in terms of a two-fluid approximation--as weighted averages of the superconducting state ones and the normal state ones representing contributions of the vortex cores, the weight of the latter increasing linearly with the field. This allows us to reproduce and interpret the fast decrease with increasing H of the well known 400 cm(-1) peak (transverse plasma mode) in the c-axis conductivity, observed by LaForge and co-workers. For the local conductivities of underdoped YBa(2)Cu(3)O(7-δ) with T(c)=58 K reported by Dubroka and co-workers and the fraction of the normal state (T ≈ T(c)) component given by (μ(0)H/25 T), the computed field induced changes of the reflectivity are in quantitative agreement with the data. This suggests that the response at H=0 and T ≈ T(c) is close to that at H=25 T < H(c2) and T ≪ T(c), in accord with theories attributing the above T(c) state to that of a superconductor lacking long-range phase coherence. Also discussed are changes of the response induced by H parallel to the CuO(2) planes.
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Affiliation(s)
- J Marek
- Department of Condensed Matter Physics, Faculty of Science, and Central European Institute of Technology, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic.
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Lee WS, Tanaka K, Vishik IM, Lu DH, Moore RG, Eisaki H, Iyo A, Devereaux TP, Shen ZX. Dependence of band-renormalization effects on the number of copper oxide layers in Tl-based copper oxide superconductors revealed by angle-resolved photoemission spectroscopy. PHYSICAL REVIEW LETTERS 2009; 103:067003. [PMID: 19792598 DOI: 10.1103/physrevlett.103.067003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Indexed: 05/28/2023]
Abstract
Here we report the first angle-resolved photoemission measurement on nearly optimally doped multilayer Tl-based superconducting cuprates (Tl-2212 and Tl-1223) and a comparison study to single-layer (Tl-2201) compound. A "kink" in the band dispersion is found in all three compounds but exhibits different momentum dependence for the single-layer and multilayer compounds, reminiscent to that of Bi-based cuprates. This layer number dependent renormalization effect strongly implies that the spin-resonance mode is unlikely to be responsible for the dramatic renormalization effect near the antinodal region.
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Affiliation(s)
- W S Lee
- SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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5
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Xie W, Jepsen O, Andersen OK, Chen Y, Shen ZX. Insights from angle-resolved photoemission spectroscopy of an undoped four-layered two-gap high-T(c) superconductor. PHYSICAL REVIEW LETTERS 2007; 98:047001. [PMID: 17358798 DOI: 10.1103/physrevlett.98.047001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2006] [Indexed: 05/14/2023]
Abstract
An undoped cuprate with apical fluorine and inner (i) and outer (o) CuO(2) layers is a 60 K superconductor whose Fermi surface has large n- and p-doped sheets with the superconducting gap on the n sheet twice that on the p sheet. The Fermi surface is not reproduced by the local density approximation, but the screening must be substantially reduced due to electronic correlations, and oxygen in the o layers must be allowed to dimple outwards. This charges the i layers by 0.01|e|, causes a 0.4 eV Madelung-potential difference between the i and o layers, quenches the i-o hopping, and localizes the n sheets onto the i layers, thus protecting their d-wave pairs from being broken by scattering on impurities in the BaF layers. The correlation-reduced screening strengthens the coupling to z-axis phonons.
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Affiliation(s)
- Wenhui Xie
- Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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6
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Chen Y, Iyo A, Yang W, Zhou X, Lu D, Eisaki H, Devereaux TP, Hussain Z, Shen ZX. Anomalous Fermi-surface dependent pairing in a self-doped high-Tc superconductor. PHYSICAL REVIEW LETTERS 2006; 97:236401. [PMID: 17280217 DOI: 10.1103/physrevlett.97.236401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Indexed: 05/13/2023]
Abstract
We report the discovery of a self-doped multilayer high Tc superconductor Ba2Ca3Cu4O8F2 (F0234) which contains distinctly different superconducting gap magnitudes along its two Fermi-surface sheets. While formal valence counting would imply this material to be an undoped insulator, it is a self-doped superconductor with a Tc of 60 K, possessing simultaneously both electron- and hole-doped Fermi-surface sheets. Intriguingly, the Fermi-surface sheet characterized by the much larger gap is the electron-doped one, which has a shape disfavoring two electronic features considered to be important for the pairing mechanism: the van Hove singularity and the antiferromagnetic (pi/a, pi/a) scattering.
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Affiliation(s)
- Yulin Chen
- Department of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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7
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Qian D, Hsieh D, Wray L, Chuang YD, Fedorov A, Wu D, Luo JL, Wang NL, Viciu L, Cava RJ, Hasan MZ. Low-lying quasiparticle states and hidden collective charge instabilities in parent cobaltate superconductors. PHYSICAL REVIEW LETTERS 2006; 96:216405. [PMID: 16803261 DOI: 10.1103/physrevlett.96.216405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2005] [Indexed: 05/10/2023]
Abstract
We report a state-of-the-art photoemission (angle-resolved photoemission spectroscopy) study of high quality single crystals of NaxCoO2 the series focusing on the fine details of the low-energy states. The Fermi velocity is found to be small (<0.5 eV A) and only weakly anisotropic over the Fermi surface at all dopings, setting the size of the pair wave function to be on the order of 10-20 nm. In the low-doping regime, the exchange interlayer splitting vanishes and two-dimensional collective instabilities such as 120 degrees -type fluctuations become kinematically allowed. Our results suggest that the unusually small Fermi velocity and the unique symmetry of kinematic instabilities distinguish cobaltates from most other oxide superconductors.
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Affiliation(s)
- D Qian
- Department of Physics, Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544, USA
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Aiura Y, Yoshida Y, Hase I, Ikeda SI, Higashiguchi M, Cui XY, Shimada K, Namatame H, Taniguchi M, Bando H. Kink in the dispersion of layered strontium ruthenates. PHYSICAL REVIEW LETTERS 2004; 93:117005. [PMID: 15447372 DOI: 10.1103/physrevlett.93.117005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2004] [Indexed: 05/24/2023]
Abstract
We present detailed energy dispersions near the Fermi level along the high symmetry line GammaX on the monolayer and bilayer strontium ruthenates Sr2RuO4 and Sr3Ru2O7, determined by high-resolution angle-resolved photoemission spectroscopy. A kink in the dispersion is clearly shown for the both ruthenates. The energy position of the kink and the slope in the low-energy part near the Fermi level are almost identical between them, whereas the dispersion in the high-energy part varies, like the behavior of the kink for the cuprate superconductors.
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Affiliation(s)
- Y Aiura
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
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9
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Zhou XJ, Yoshida T, Lee DH, Yang WL, Brouet V, Zhou F, Ti WX, Xiong JW, Zhao ZX, Sasagawa T, Kakeshita T, Eisaki H, Uchida S, Fujimori A, Hussain Z, Shen ZX. Dichotomy between nodal and antinodal quasiparticles in underdoped (La2-xSrx)CuO4 superconductors. PHYSICAL REVIEW LETTERS 2004; 92:187001. [PMID: 15169524 DOI: 10.1103/physrevlett.92.187001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2003] [Indexed: 05/24/2023]
Abstract
High resolution angle-resolved photoemission measurements on an underdoped (La(2-x)Srx)CuO4 system show that, at energies below 70 meV, the quasiparticle peak is well defined around the (pi/2,pi/2) nodal region and disappears rather abruptly when the momentum is changed from the nodal point to the (pi,0) antinodal point along the underlying "Fermi surface." It indicates that there is an extra low energy scattering mechanism acting upon the antinodal quasiparticles. We propose that this mechanism is the scattering of quasiparticles across the nearly parallel segments of the Fermi surface near the antinodes.
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Affiliation(s)
- X J Zhou
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305, USA
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10
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Pailhès S, Sidis Y, Bourges P, Ulrich C, Hinkov V, Regnault LP, Ivanov A, Liang B, Lin CT, Bernhard C, Keimer B. Two resonant magnetic modes in an overdoped high T(c) superconductor. PHYSICAL REVIEW LETTERS 2003; 91:237002. [PMID: 14683208 DOI: 10.1103/physrevlett.91.237002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2003] [Indexed: 05/24/2023]
Abstract
A detailed inelastic neutron scattering study of the overdoped high temperature copper oxide superconductor Y(0.9)Ca(0.1)Ba(2)Cu(3)O(7) reveals two-distinct magnetic resonant modes in the superconducting state. The modes differ in their symmetry with respect to exchange between adjacent copper oxide layers. Counterparts of the mode with odd symmetry, but not the one with even symmetry, had been observed before at lower doping levels. The observation of the even mode resolves a long-standing puzzle, and the spectral weight ratio of both modes yields an estimate of the onset of particle-hole spin-flip excitations.
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Affiliation(s)
- S Pailhès
- Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif sur Yvette, France
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11
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Kaminski A, Rosenkranz S, Fretwell HM, Li ZZ, Raffy H, Randeria M, Norman MR, Campuzano JC. Crossover from coherent to incoherent electronic excitations in the normal state of Bi(2)Sr(2)CaCu(2)O(8+delta). PHYSICAL REVIEW LETTERS 2003; 90:207003. [PMID: 12785917 DOI: 10.1103/physrevlett.90.207003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2002] [Indexed: 05/24/2023]
Abstract
Angle resolved photoemission spectroscopy (ARPES) and resistivity measurements are used to explore the overdoped region of the high temperature superconductor Bi(2)Sr(2)CaCu(2)O(8+delta). We find evidence for a new crossover line in the phase diagram between a coherent metal phase, for lower temperatures and higher doping, and an incoherent metal phase, for higher temperatures and lower doping. The former is characterized by two well-defined spectral peaks in ARPES due to coherent bilayer splitting and superlinear behavior in the resistivity, whereas the latter is characterized by a single broad spectral feature in ARPES and a linear temperature dependence of the resistivity.
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Affiliation(s)
- A Kaminski
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
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12
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Eschrig M, Norman MR. Dispersion anomalies in bilayer cuprates and the odd symmetry of the magnetic resonance. PHYSICAL REVIEW LETTERS 2002; 89:277005. [PMID: 12513236 DOI: 10.1103/physrevlett.89.277005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2002] [Indexed: 05/24/2023]
Abstract
We demonstrate that recent angle resolved photoemission data in bilayer cuprate superconductors imply that scattering of electrons between bonding and antibonding bands is strong compared to scattering within these bands. As a consequence, the resulting data can be reproduced only by a model which assumes that the electrons are interacting with a bosonic mode that is odd with respect to the layer indices. This odd symmetry is a unique property of the magnetic resonance observed by inelastic neutron scattering.
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Affiliation(s)
- M Eschrig
- Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
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13
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Abanov A, Chubukov AV, Eschrig M, Norman MR, Schmalian J. Neutron resonance in the cuprates and its effect on fermionic excitations. PHYSICAL REVIEW LETTERS 2002; 89:177002. [PMID: 12398698 DOI: 10.1103/physrevlett.89.177002] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2001] [Indexed: 05/24/2023]
Abstract
We argue that the exciton scenario for the magnetic resonance in the cuprate superconductors yields a small spectral weight of the resonance, in agreement with experiment. We show that the small weight is related to its concentration in a small region of momentum and energy. Despite this, we find that a large fermionic self-energy can indeed be generated by a resonance with such properties, i.e., the scattering from the resonance substantially affects the electronic properties of the cuprates below T(c).
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Affiliation(s)
- Ar Abanov
- Theory Division, Los Alamos National Laboratory, MS B262, Los Alamos, New Mexico 87545, USA
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14
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Bogdanov PV, Lanzara A, Zhou XJ, Yang WL, Eisaki H, Hussain Z, Shen ZX. Anomalous momentum dependence of the quasiparticle scattering rate in overdoped Bi2Sr2CaCu2O8. PHYSICAL REVIEW LETTERS 2002; 89:167002. [PMID: 12398747 DOI: 10.1103/physrevlett.89.167002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2002] [Indexed: 05/24/2023]
Abstract
The question of the anisotropy of the electron scattering in high temperature superconductors is investigated using high resolution angle-resolved photoemission data from Pb-doped Bi2Sr2CaCu2O8 (Bi2212) with suppressed superstructure. The scattering rate of low energy electrons along two bilayer-split pieces of the Fermi surface is measured (via the quasiparticle peak width), and no increase of scattering towards the antinode (pi,0) region is observed, contradicting the expectation from Q=(pi,pi) scattering. The results put a limit on the effects of Q=(pi,pi) scattering on the electronic structure of this overdoped superconductor with still very high T(c).
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Affiliation(s)
- P V Bogdanov
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, California 94305, USA
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15
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Kordyuk AA, Borisenko SV, Kim TK, Nenkov KA, Knupfer M, Fink J, Golden MS, Berger H, Follath R. Origin of the peak-dip-hump line shape in the superconducting-state (pi,0) photoemission spectra of Bi2Sr2CaCu2O8. PHYSICAL REVIEW LETTERS 2002; 89:077003. [PMID: 12190550 DOI: 10.1103/physrevlett.89.077003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2001] [Indexed: 05/23/2023]
Abstract
From detailed high-resolution measurements of the photon energy dependence of the (pi,0) superconducting-state photoemission spectrum of the bilayer Bi high-temperature superconductors, we show that the famous peak-dip-hump line shape is dominated by a superposition of spectral features originating from different electronic states which reside at different binding energies, but are each describable by essentially identical single-particle spectral functions. The previously identified bilayer-split CuO2 bands are the culprit: with the "superconducting" peak being due to the antibonding band, while the hump is mainly formed by its bonding bilayer-split counterpart.
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Affiliation(s)
- A A Kordyuk
- Institute for Solid State Research, IFW Dresden, P.O. Box 270016, Germany
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Yusof ZM, Wells BO, Valla T, Fedorov AV, Johnson PD, Li Q, Kendziora C, Jian S, Hinks DG. Quasiparticle liquid in the highly overdoped Bi(2)Sr(2)CaCu(2)O(8+delta). PHYSICAL REVIEW LETTERS 2002; 88:167006. [PMID: 11955253 DOI: 10.1103/physrevlett.88.167006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2001] [Indexed: 05/23/2023]
Abstract
Results from the study of a highly overdoped (OD) Bi(2)Sr(2)CaCu(2)O(8+delta) with a T(c) = 51 K using angle-resolved photoemission spectroscopy are presented. We observe a sharp peak in the spectra near ( pi,0) that persists well above T(c), a nodal self-energy which approaches that seen for the Mo(110) surface state, and a more k-independent line shape at the Fermi surface than the lower-doped cuprates. This allows for a realistic comparison of the lifetime values to the experimental resistivity measurements. These observations point to the validity of the quasiparticle picture for the OD even in the normal state.
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Affiliation(s)
- Z M Yusof
- Department of Physics, University of Connecticut, 2152 Hillside Road U-46, Storrs, Connecticut 06269-3046, USA
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17
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Tanaka Y. Soliton in two-band superconductor. PHYSICAL REVIEW LETTERS 2002; 88:017002. [PMID: 11800980 DOI: 10.1103/physrevlett.88.017002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2001] [Indexed: 05/23/2023]
Abstract
There is a soliton in a superconductor having two bands (two-band superconductor), when the interband interaction is much smaller than the intraband interaction. This soliton is in a stable state. In the soliton the relative phase between two gap parameters rotates 0 to 2pi (or -pi to pi), where each gap resides in each band. A phase slip of the superconducting order parameter is accompanied with the soliton. The phase slip is not nx2pi where n is an integer. A soliton traps the flux inside the superconducting ring, of which magnitude is not integral multiples of the fluxoid quantum.
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Affiliation(s)
- Y Tanaka
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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18
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Lanzara A, Bogdanov PV, Zhou XJ, Kellar SA, Feng DL, Lu ED, Yoshida T, Eisaki H, Fujimori A, Kishio K, Shimoyama JI, Noda T, Uchida S, Hussain Z, Shen ZX. Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors. Nature 2001; 412:510-4. [PMID: 11484045 DOI: 10.1038/35087518] [Citation(s) in RCA: 230] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Coupling between electrons and phonons (lattice vibrations) drives the formation of the electron pairs responsible for conventional superconductivity. The lack of direct evidence for electron-phonon coupling in the electron dynamics of the high-transition-temperature superconductors has driven an intensive search for an alternative mechanism. A coupling of an electron with a phonon would result in an abrupt change of its velocity and scattering rate near the phonon energy. Here we use angle-resolved photoemission spectroscopy to probe electron dynamics-velocity and scattering rate-for three different families of copper oxide superconductors. We see in all of these materials an abrupt change of electron velocity at 50-80 meV, which we cannot explain by any known process other than to invoke coupling with the phonons associated with the movement of the oxygen atoms. This suggests that electron-phonon coupling strongly influences the electron dynamics in the high-temperature superconductors, and must therefore be included in any microscopic theory of superconductivity.
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Affiliation(s)
- A Lanzara
- Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
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