A new high-Tc TlBa2Ca3Cu4O11 superconductor with Tc &gt;120K

Ihara, Hideo; Sugise, Ryoji; Hirabayashi, Masayuki; Terada, Norio; Jo, Masatoshi; Hayashi, Kazuhiko; Negishi, Akira; Tokumoto, M.; Kimura, Yoshitaka; Shimomura, Takehiko

doi:10.1038/334510a0

Cited by 209 publications

(33 citation statements)

References 5 publications

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“…It is indicated that the maximum T c monotonically increases with n and saturates at either nϭ3 or 4. 1,2 The bilayer compounds have crystallographically equivalent CuO 2 planes, while the tri-and tetralayer compounds have inequivalent planes, i.e., the outer pyramidal coordinated planes ͑OP͒ and the inner square coordinated planes ͑IP͒. By calculating the Madelung energy for Bi and Tl compounds in the point-charge model, it was shown that the hole density of the IP, N h ͑IP͒, is lower than that of the OP, N h ͑OP͒, since the IP is sandwiched by Ca sheets with positive charge.…”

Section: Introductionmentioning

confidence: 97%

Electronic states and superconductivity in multilayer high-Tccuprates

2002

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We study electronic states of multilayer cuprates in the normal phases as functions of the number of CuO 2 planes and the doping rate. The resonating valence bond wave function and the Gutzwiller approximation are used for a two-dimensional multilayer t-tЈ-tЉ-J model. We calculate the electron-removal spectral functions at (,0) in the CuO 2 plane next to the surface to understand the angle-resolved photoemission spectroscopy ͑ARPES͒ spectra. We find that the trilayer spectrum is narrower than the bilayer spectrum but is wider than the monolayer spectrum. In the tri-and tetralayer systems, the outer CuO 2 plane has different superconducting amplitude from the inner CuO 2 plane, while each layer in the bilayer systems has same amplitude. The recent ARPES and NMR experiments are discussed in the light of the present theory.

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Section: Introductionmentioning

confidence: 97%

Electronic states and superconductivity in multilayer high-Tccuprates

2002

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“…We also prepared TlBa2Ca3-Cu4011 by standard procedures, using a TI overpressure before the final 02 anneal in a MgO tube. X-ray powder diffraction analysis of this material showed that it contained -85% of the TlBa2Ca3Cu40O1 phase [Tc -120 K (24)]. This sample showed a Tc of 118 K, a T1/2 of 103 K, and 100% exclusion.…”

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confidence: 97%

Axial Oxygen-Centered Lattice Instabilities and High-Temperature Superconductivity

Conradson

Raistrick

Bishop

1990

Science

133

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Copper K-edge x-ray absorption data indicate that an axial oxygen-centered lattice instability accompanying the 93 K superconducting transition in YBa(2)Cu(3)O(7) is of a pseudo-(anti)ferroelectric type, in that it appears to involve the softening of a double potential well into a structure in which the difference between the two copper-oxygen distances and the barrier height have both decreased. This softer structure is present only at temperatures within a fluctuation region around the transition. A similar process involving the analogous axial oxygen atom also accompanies the superconducting transition in T1Ba(2)Ca(3)Cu(4)O(11), where the superconducting transition temperature T(c) is ~120 K. The mean square relative displacement of this oxygen atom in YBa(2)Cu(3)O(7) is also specifically affected by a reduction in the oxygen content and by the substitution of cobalt for copper, providing further evidence for the sensitivity of the displacement to additional factors that also influence the superconductivity. On the basis of the implied coupling of this ionic motion to the superconductivity, a scenario for high-temperature superconductivity is presented in which both phonon and electronic (charge transfer) channels are synergistically involved.

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“…4, or 5 [2][3][4][5][6][7][8][9][10]. These are the striking facts: T^ increases markedly with the number n of CuO sheets per formula unit; properties parallel and perpendicular to the layers are highly anisotropic; layers within a unit are not necessarily equivalent; the transition to the superconducting state is not very sharp, pointing to the importance of inhomogeneities.…”

Section: Introductionmentioning

confidence: 97%

Critical temperature and the Ginzburg-Landau theory of layered high-temperature superconductors

Schneider

1989

IBM J. Res. & Dev.

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Using the mean-field approximation, we study a model for quasi-two-dimensional superconductors. Tfie interlayer coupling, assumed to be mediated by a small electronhopping term, is found to leave T^ practically unaffected. Thus, a three-dimensional pairing mechanism is required to explain the observed rise in T^ with decreasing average layer spacing in the Bi and Tl compounds. Taking the inhomogeneities of intrinsic or extrinsic nature into account, we find, in the dirty limit, corrections to the conventional anisotropic Ginzburg-Landau behavior-an upward curvature of the upper critical fields which appears to be a universal feature of layered superconductors.''

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A new high-Tc TlBa2Ca3Cu4O11 superconductor with Tc >120K

Cited by 209 publications

References 5 publications

Electronic states and superconductivity in multilayer high-Tccuprates

Electronic states and superconductivity in multilayer high-Tccuprates

Axial Oxygen-Centered Lattice Instabilities and High-Temperature Superconductivity

Critical temperature and the Ginzburg-Landau theory of layered high-temperature superconductors

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