On the oxygen isotope effect and apex anharmonicity in high-Tc cuprates

Emphasis is put on aprecise knowledge of the oxygen isotope shift exponent αO is the so far synthesized high-Tc superconductors in order to elucidate the basic mechanism. The known data, see αa in Table 6, indicate the presence of a presumably anharmonic coupling of pyramidal apex oxygen motion along thec-axis in these highly in-plane correlated superconductors. αa is computed from αO=rαa, based on the conjecture that the ratior of apex to total oxygen-ion content per unit cell is relevant. The related experimental and theoretical literature is reviewed.

[1]  Bauer,et al.  Phonon anomalies and range of superconducting energy gaps from infrared studies of YBa2Cu3O7- delta. , 1989, Physical review. B, Condensed matter.

[2]  Y. Tokura,et al.  A superconducting copper oxide compound with electrons as the charge carriers , 1989, Nature.

[3]  K. Müller,et al.  Possible highTc superconductivity in the Ba−La−Cu−O system , 1986 .

[4]  W. F. Peck,et al.  Studies of oxygen-deficient Ba2YCu3O7−δ and superconductivity Bi(Pb)SrCaCuO , 1988 .

[5]  G. Roth,et al.  Phonon density-of-states for high-Tc (Y, RE) Ba2Cu3O7 superconductors and non-superconducting reference systems , 1988 .

[6]  K. Müller,et al.  Nuclear magnetic resonance of La139 and Al27 and electron paramagnetic resonance of Fe3+ in lanthanum aluminate ☆ , 1964 .

[7]  B. Hennion,et al.  Phonons in YBa2Cu3O7-δ , 1989 .

[8]  K. Müller,et al.  SrTi O 3 : An intrinsic quantum paraelectric below 4 K , 1979 .

[9]  E. Maxwell,et al.  ISOTOPE EFFECT IN THE SUPERCONDUCTIVITY OF MERCURY , 1950 .

[10]  R. Zamboni,et al.  Evidence of strong electron-phonon coupling from infrared excited Raman scattering in the YBa2Cu3O7-y superconducting system , 1989 .

[11]  J. Friedel.  The high-Tc superconductors: a conservative view , 1989 .

[12]  Moran,et al.  Pressure dependence of Tc in L2-xMxCuO4-y (L=Pr,Nd,Sm,Eu; M=Ce,Th): Antisymmetric behavior of electron- versus hole-doped copper-oxide superconductors. , 1990, Physical review letters.

[13]  L. Cooper,et al.  Theory of superconductivity , 1957 .

[14]  Baer,et al.  High-resolution photoemission study of the low-energy excitations reflecting the superconducting state of Bi-Sr-Ca-Cu-O single crystals. , 1989, Physical review letters.

[15]  Gurvitch,et al.  Resistivity of La1.825Sr0.175CuO4 and YBa2Cu3O7 to 1100 K: Absence of saturation and its implications. , 1987, Physical review letters.

[16]  T. C. Huang,et al.  Properties that change as superconductivity disappears at high-doping concentrations in La2-xSrxCuO4. , 1989, Physical review. B, Condensed matter.

[17]  K. Müller.  Microscopic Probing of BaTiO3 Ferroelectric Phase Transitions by EPR , 1987 .

[18]  W. Weber.  A Cud-d excitation model for the pairing in the high-Tc cuprates , 1988 .

[19]  K. Müller,et al.  Earlier and Recent Aspects of Superconductivity , 1990 .

[20]  Chen,et al.  Isotope effect in the high-Tc superconductors Ba2YCu3O7 and Ba2EuCu3O7. , 1987, Physical review letters.

[21]  P. B. Allen.  Isotope shift controversies , 1988, Nature.

[22]  P. Wachter,et al.  Strong pressure dependence of Tc of the new 80 K phase YBa2Cu4O8+x , 1989 .

[23]  Eriksson,et al.  Raman spectra, superconductivity, and structure of Co-substituted YBa2Cu3O7- delta. , 1989, Physical review. B, Condensed matter.

[24]  Wei,et al.  Small oxygen isotope shift in YBa2Cu3O7. , 1987, Physical review. B, Condensed matter.

[25]  J. Hardy,et al.  Structural phase transitions, ferroelectricity and high temperature superconductivity , 1988 .

[26]  W. F. Peck,et al.  Superconductivity near 70 K in a new family of layered copper oxides , 1988, Nature.

[27]  H. Conrad,et al.  Observation of an oxygen isotope effec t in YBa 2 Cu 3 O 7 , 1987 .

[28]  Donald M. Ginsberg,et al.  Physical properties of high temperature superconductors , 1998 .

[29]  K. Müller,et al.  Superconductivity in oxides: toward a unified picture , 1989 .

[30]  Anant Narlikar,et al.  Studies of high temperature superconductors : advances in research and applications , 1989 .

[31]  M. R. Schafroth,et al.  Superconductivity of a Charged Ideal Bose Gas , 1955 .

[32]  Gervais,et al.  Analysis of infrared reflection spectra of oxides of the La2CuO4 high -Tc superconductor family in polarized light. , 1988, Physical review. B, Condensed matter.

[33]  Y. Tokura,et al.  Anomalous absence of pressure effect on transition temperature in the electron-doped superconductor Nd1.85Ce0.15CuO4–δ , 1989, Nature.

[34]  Emin.  Formation, motion, and high-temperature superconductivity of large bipolarons. , 1989, Physical review letters.

[35]  V. Ginzburg.  The problem of high temperature superconductivity , 1970 .

[36]  Büttner,et al.  Possibility of a common origin to ferroelectricity and superconductivity in oxides. , 1989, Physical review. B, Condensed matter.

[37]  White,et al.  Nonzero isotope effect in La1.85Sr , 1987, Physical review letters.

[38]  A. Bruce,et al.  Structural phase transitions , 1981 .

[39]  C. Catlow,et al.  The pressure dependence of the crystal structure of La2CuO4 , 1988 .

[40]  Bishop,et al.  Ultrasound studies of the high-Tc superconductor La1.85Sr0.15CuO4. , 1987, Physical review. B, Condensed matter.

[41]  F. Waldner,et al.  Magnetic Correlations and Spin Dynamics in La2-xSrxCuO4 from NQR Relaxation , 1990 .

[42]  J. C. Phillips.  Physics of high-T[c] superconductors , 1989 .

[43]  H. Hoevers,et al.  Determination of the energy gap in a thin YBa2Cu3O7−x film by Andreev reflection and by tunneling , 1990 .

[44]  T. Faltens,et al.  Observation of an Isotope Shift in the Superconducting Transition Temperature of , 1987 .

[45]  V. Aksenov,et al.  On the role of quasilocal excitations in the lattice of high-Tc superconductors , 1979 .

[46]  M. Salamon,et al.  Excitonic Superconductivity in Layer Structures , 1987 .

[47]  Poon,et al.  Anomalous oxygen isotope effect in La2-xSrxCuO4. , 1990, Physical review. B, Condensed matter.

[48]  F. Steglich,et al.  Transport Properties of YBa2Cu3O7: Resistivity, Thermal Conductivity, Thermopower and Hall Effect , 1987 .

[49]  S. K. Deb,et al.  Oxygen isotope effect in the superconducting BiSrCaCuO system , 1988 .

[50]  S. Conradson,et al.  The Axial Oxygen Atom and Superconductivity in YBa2Cu3O7 , 1989, Science.

[51]  K. Andres,et al.  4f-virtual-bound-state formation in CeAl$sub 3$ at low temperatures , 1975 .

[52]  S. K. Deb,et al.  Isotope Effect in Superconducting YBa2Cu3O7-δ System , 1987 .

[53]  Allen,et al.  Band gaps and electronic structure of transition-metal compounds. , 1985, Physical review letters.

[54]  Bishop,et al.  Possibility of optical evidence for charge-transfer excitations in YBa2Cu3O7- delta. , 1989, Physical review. B, Condensed matter.

[55]  Hardy,et al.  Possible origins of high-Tc superconductivity. , 1988, Physical review letters.

[56]  P. Fischer,et al.  Low temperature anomalies and pressure effects on the structure and Tc of the superconductor YBa2Cu4O8 (Tc=80 K) , 1989 .

[57]  V. Aksenov,et al.  ANHARMONIC MODEL FOR HIGH-Tc SUPERCONDUCTORS. , 1987 .

[58]  H. Eschrig.  Chemical aspects and the correlated electronic structure of superconductor oxocuprates , 1989 .

[59]  H. Yasuoka.  Strong Correlation and Superconductivity , 1989 .

[60]  J. Besson.  Pressure dependence of Tc and electron phonon interaction in MBa2Cu3O7 systems , 1989 .

[61]  W. Hanke,et al.  Generalized Hubbard Models for Cu-O-Based Superconductors: Field-Theoretical and Monte-Carlo Results , 1990 .