Specific Heat of Zn-Doped YBa_{2}Cu_3O_{6.95}: Possible Evidence for Kondo Screening in the Superconducting State

TL;DR

This study investigates how Zn doping affects the specific heat of YBa2Cu3O6.95, providing potential evidence for Kondo screening phenomena in the superconducting state through magnetic field-dependent measurements.

Contribution

It presents experimental data on the magnetic field dependence of specific heat in Zn-doped YBa2Cu3O6.95, highlighting possible Kondo screening effects in the superconducting phase.

Findings

Observation of magnetic field dependence of specific heat

Evidence suggesting Kondo screening in the superconducting state

Detection of Schottky anomaly related to Zn-induced magnetic moments

Abstract

The magnetic field dependence of the specific heat of Zn-doped single crystals of YBa_{2}Cu_3O_{6.95} was measured between 2 and 10 K and up to 8 Tesla. Doping levels of 0, 0.15%, 0.31%, and 1% were studied and compared. In particular we searched for the Schottky anomaly associated with the Zn-induced magnetic moments.