Bose-Einstein Condensation Picture of Superconductivity in High Temperature Superconductors (Dilute Metals)

TL;DR

This paper proposes a Bose-Einstein condensation model for high-temperature superconductivity, analyzing structural parameters and electron properties of various superconductors, including newly identified materials with very high critical temperatures.

Contribution

It introduces a BEC-based perspective for understanding superconductivity in high-temperature materials and estimates key parameters like electron density and effective mass.

Findings

High-Tc superconductors can be described as Bose-Einstein condensates.

Structural instability in some superconductors relates to ion radius differences.

Large effective masses suggest polaron or bipolaron involvement.

Abstract

Structures and parameters of some high and low temperature superconductors (HTSC, LTSC) are considered basing on the alternative estimate of the O2- ion radius magnitude (0.5-0.6) A. Phase transitions into the superconducting state are considered as the Bose-Einstein condensation (BEC). The super HTSC with Tc = 371 K (YBa2Cu3Se7) and TC ~ 400K (Ag2(Ag3Pb2H2O6)) and LTSC with Tc~0.3K (SrNbxTi(1-x)O3) are shown to be of the BEC type. Instability of the structure of the first one results from higher magnitude of the Se2- ion radius in comparison with the O2- radius. The second one forms quasi one-dimensional structures and is rather inpractical. The electron density and the effective mass are estimated for some stoichiometric and non-stoichiometric (nano-composite) high temperature superconductors, which have some peculiar features. Large effective masses can indicate existance of polarons (bipolarons) in such systems. Some new superconductors MgxWO3.