Physics of Spin Glass Freezing and Paired Cluster Model of High-Tc Superconductivity

TL;DR

This paper introduces a new paired cluster model explaining high-T_c superconductivity phenomena, including pseudogap behavior, energy gaps, and magnetic properties, aligning well with experimental observations.

Contribution

The paper presents a novel paired cluster model that comprehensively explains high-T_c superconductivity properties and phenomena, including pseudogap and magnetic effects.

Findings

Predicted coexistence of NSPG and superconducting gap before experimental observation

Explained the origin of high T_c and pseudogap phenomena

Accounted for magnetic and vortex core pseudogap behaviors

Abstract

We present here a new mechanism of high-T_c (critical temperature) superconductivity. This new model is able to explain all the HTSC (high-T_c superconductivity) properties, like high T_c, origin and nature of NSPG (normal state pseudogap), anomalous superconducting state (SS) energy gap (SSEG) properties, absence of NMR spin relaxation rate coherence peak, existence of NSPG below T_c, nature of high-T_c magnetic superconductivity, external magnetic field (H) dependence of the NSPG formation temperature T^*, etc. The coexistence of NSPG and SS BCS enegy gap (EG), below T_c, has been predicted by the model before its experimental observation, showing that the observed SSEG is a superposition of NSPG and SS BCS EG. The model, called the paired cluster (PC) model, is also able to explain the pseudogap critical concentration, vortex core pseudogap and possible stripe phase in high-T_c superconductors. We do not find any experimental observation which is not in favour of the model. Their results follow as a natural consequence of the physical picture contained in the model. Several such results are discussed.