Nonadiabatic polaronic superconductivity in MgB2 and cuprates
نویسنده
چکیده
منابع مشابه
Superconductivity in Fe and As based compounds: A bridge between MgB2 and cuprates
By interpreting various experimental data for the new high temperature FeAs type superconductors in terms of lattice mediated multigap superconductivity, it is shown that these systems strongly resemble MgB2, however, with the distinction that local polaronic lattice effects exist. This fact establishes a connection to cuprate high temperature superconductors where polaron formation is essentia...
متن کاملSuperconducting Properties of MgB2 Thin Films Prepared on Flexible Plastic Substrates
130 LLE Review, Volume 91 The recent discovery of superconductivity at 39 K in hexagonal magnesium diborides1 has stimulated very intensive investigations of the fundamental mechanism of superconductivity in MgB2 as well as the possible practical applications of this new superconductor. In comparison with high-temperature cuprates, MgB2 superconductors have more than two-timeslower anisotropy, ...
متن کاملOxygen Isotope Effects on Tc Related to Polaronic Superconductivity in Underdoped Cuprates
The planar oxygen isotope effect on Tc observed in copper oxide superconductors is remarkable in that it increases from near nil at optimal doping to a value twice that derived from BCS theory in the underdoped region. This behavior is quantitatively followed by a formula proposed by Kresin and Wolf in 1994 for polarons along the c-axis. Herein it is revisited in a more transparent way, and it ...
متن کاملElectrical conductivity anomaly in silver vadadium-tellurite glasses at temperatures higher than a characteristic temperature: evidence for an ionic-nonadiabatic polaronic mixed conduction
Electrical conduction anomaly was observed in the mixed ion-polaron regime for xAg2O-40TeO2-(60-x)V2O5 glassy system with 0 ≤x≤ 50 mol%, which were prepared by common melt quenching method. For the understudied glasses, the temperature dependence of dc electrical conductivity was measured from a characteristic temperature to 380 K, which certified their semiconducting nature. The measured condu...
متن کامل1 3 M ar 2 00 2 Fröhlich - Coulomb model of high - temperature superconductivity and charge segregation in the cuprates
Fröhlich-Coulomb model of high-temperature superconductivity and charge segregation in the cuprates. Abstract. We introduce a generic Fröhlich-Coulomb model of the oxides, which also includes infinite on-site (Hubbard) repulsion, and describe a simple analytical method of solving the multi-polaron problem in complex lattice structures. Two particular lattices, a zigzag ladder and a perovskite l...
متن کامل