Averaged effective pinning potential in YBCO single crystals close to Tc

TL;DR

This study investigates magnetic flux pinning in YBCO single crystals near the critical temperature, revealing strong pinning effects and nonmonotonic behavior of the pinning potential with temperature.

Contribution

It provides new insights into the low-density flux pinning characteristics and temperature dependence of the effective pinning potential in YBCO single crystals.

Findings

Strong pinning observed in unidirectional planar defects

Nonmonotonic temperature dependence of pinning potential

Magnetization relaxation measurements near Tc

Abstract

In this paper we present our results on the low density magnetic flux pinning characteristics, obtained though HTSC samples magnetization relaxation measurements M(t) near the phase transition temperatures (0,8 < T/Tc > 0,99).As the main object of investigation we have chosen pure YBa2Cu3O7-x (YBCO) single crystal samples with optimal oxygen saturation. We note the presence of strong pinning in the system of unidirectional planar defects and a significant nonmonotonicity of the Up(T) dependence behavior for low density trapped magnetic flux.