Resistivity study of the pseudogap phase for (Hg,Re) - 1223 superconductors

TL;DR

This study systematically investigates the pseudogap phase in (Hg,Re)-1223 high-temperature superconductors through resistivity measurements, identifying key temperature scales and proposing a general method applicable to various HTSCs.

Contribution

It introduces a detailed resistivity measurement method to accurately determine multiple temperature scales in HTSCs, enhancing understanding of their normal state and phase diagram.

Findings

Identified pseudogap temperature $T^{*}(n)$ as a function of doping

Determined layer coupling temperature $T_{LD}(n)$ and fluctuation temperature $T_{scf}(n)$

Established a general method for phase diagram analysis in HTSCs

Abstract

The pseudogap phase above the critical temperature of high $T_{c}$ superconductors (HTSC) presents different energy scales and it is currently a matter of intense study. The complexity of the HTSC normal state requires very accurate measurements with the purpose of distinguishing different types of phenomena. Here we have performed systematically studies through electrical resistivity ($\rho$) measurements by several different current densities in order to obtain an optimal current for each sample. This approach allows to determine reliable values of the pseudogap temperature $T^{*}(n)$, the layer coupling temperature between the superconductor layers $T_{LD}(n)$, the fluctuation temperature $T_{scf}(n)$ and the critical temperature $T_{c}(n)$ as function of the doping $n$. The interpretation of these different temperature scales allows to characterize possible scenarios for the (Hg,Re) - 1223 normal state. This method, described in detail here, and used to derive the (Hg,Re)-1223 phase diagram is general and can be applied to any HTSC.