Topic
High-temperature superconductivity
About: High-temperature superconductivity is a research topic. Over the lifetime, 7263 publications have been published within this topic receiving 175377 citations. The topic is also known as: high-temperature superconductivity.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, an overview of recent Raman scattering measurements in metals under conditions of high static pressure in the diamond anvil cell is presented, and the practical improvements of the traditional technique that have made these measurements possible.
Abstract: An overview is presented of recent Raman scattering measurements in metals under conditions of high static pressure in the diamond anvil cell. Also discussed are the practical improvements of the traditional technique that have made these measurements possible. We present the results of several studies including those of hexagonal close-packed (hcp) e-Fe and its solid solutions Fe(1−x)Nix (x ≤ 0.2) over a wide temperature range, and also of high-temperature superconductors (YBCO) and their prototypes, i.e. materials with strong electronic correlations such as the 3d metal oxides CoO and FeO. Copyright © 2003 John Wiley & Sons, Ltd.
82 citations
TL;DR: In this paper, a generic Frohlich-Coulomb model of oxides, which also includes infinite on-site (Hubbard) repulsion, was introduced, and a simple analytical method of solving the multi-polaron problem in complex lattice structures was described.
Abstract: We introduce a generic Frohlich-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 layer, are studied. We find that, depending on the relative strength of the Frohlich and Coulomb interactions, these systems are either polaronic Fermi (or Luttinger) liquids, bipolaronic superconductors, or charge-segregated insulators. In the superconducting phase the carriers are superlight mobile bipolarons. The model describes key features of the cuprates such as their Tc-values, the isotope effects, the normal-state diamagnetism, the pseudogap, and spectral functions measured in tunnelling and photoemission. We argue that a low Fermi energy and strong coupling of carriers with high-frequency phonons is the cause of high critical temperatures in novel superconductors.
82 citations
01 Jan 1989
TL;DR: In this paper, the main focus of a symposium on high temperature copper oxide superconductors was on the correlation effects and the relative importance of various interactions, and whether the ground state of a normal state is Fermi-liquid-like or not.
Abstract: The focal points of the symposium presented in this book were the following: For the high temperature copper oxide superconductors, the general consensus was that electron correlation effects are of essential importance. Based on this understanding a number of discussions took place: how to include the correlation effects and on the relative importance of various interactions; whether the ground state of a normal state is Fermi-liquid-like or not; where the doped holes mainly exist and on the nature of these holes; the value of the ratio of the energy gap to the critical temperature; whether the mechanics s are magnetic, or charge fluctuation, or excitonic, or very unusual ones quite different from the Fermi-liquid picture; whether a normal phase is normal or abnormal, etc. For the Bi-O superconductors, such as the BaKBiO system, the discussion concentrated on whether or not the mechanism of superconductivity is the same as that of the high temperature copper oxide superconductors.
82 citations
TL;DR: In this article, the effect of sintering temperature on the superconductivity of MgB2 pellets prepared under a high pressure of 3 GPa was investigated, and the observed surface morphology using scanning electron microscopy showed that these changes were closely related to changes in the microscopic level such as the connectivity of the grains.
Abstract: We report on the effect of sintering temperature on the superconductivity of MgB2 pellets prepared under a high pressure of 3 GPa. The superconducting properties of the nonheated MgB2 were poor. However, as the sintering temperature increased, the superconducting properties were vastly enhanced, which was demonstrated by the narrow transition width for the resistivity and the low-field magnetization. The observed surface morphology using scanning electron microscopy showed that these changes were closely related to changes in the microscopic level such as the connectivity of the grains.
82 citations
Journal Article•
TL;DR: In all high temperature superconductors, the Fermi surface topology matches the form factor of the pairing symmetry favored by local magnetic exchange interactions, and it is suggested that this match offers a principle guide to search for new high temperaturesuperconductors.
Abstract: Cuprates, ferropnictides and ferrochalcogenides are three classes of unconventional high temperature superconductors, who share similar phase diagrams in which superconductivity develops after a magnetic order is suppressed, suggesting a strong interplay between superconductivity and magnetism, although the exact picture of this interplay remains elusive. Here we show that there is a direct bridge connecting antiferromagnetic exchange interactions determined in the parent compounds of these materials to the superconducting gap functions observed in the corresponding superconducting materials: in all high temperature superconductors, the Fermi surface topology matches the form factor of the pairing symmetry favored by local magnetic exchange interactions. We suggest that this match offers a principle guide to search for new high temperature superconductors.
81 citations