On the reconstruction of the conduction electron spectrum in metal-oxide superconductors owing to the interaction with coherent atomic displacements |
| |
Authors: | V Yu Irkhin and M I Katsnelson A V Trefilov |
| |
Institution: | Institute of Metal Physics, Sverdlovsk 620219, USSR I.V. Kurchatov Institute of Atomic Energy, Moscow 123182, USSR |
| |
Abstract: | A “pseudospin ferromagnet” model is proposed which describes the interaction of conduction electrons with coherent atomic displacements in metal-oxide high-Tc superconductors (HTSC). Non-quasiparticle states (“pseudospinons”) play an important role in this model. They make an appreciable contribution to thermodynamic and transport properties (e.g., to the linear term in specific heat), although not contributing to the density of states at EF at T=0. In the superconducting phase, the pseudospinons give rise to gapless superconductivity at finite temperatures. For certain model parameter relations, a new energy scale (“Kondo temperature”) may occur in the electron spectrum near EF. Using the results obtained, experimental data on the thermopower, nuclear spin-lattice relaxation rate and other properties of HTSC are discussed. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|