Reentrant superconductivity in a composite formed by YBa$_2$Cu$_3$O$ _{7-\delta}$ and Ammonium Terbium Oxalate

TL;DR

This study investigates a composite of a high-temperature superconductor and a magnetic compound, revealing reentrant superconductivity due to coexistence with magnetism and significant changes in critical magnetic fields.

Contribution

It reports the first observation of reentrant behavior in a composite of YBa$_2$Cu$_3$O$_{7-\delta}$ and Ammonium Terbium Oxalate, highlighting the interplay between superconductivity and magnetism.

Findings

Reentrant behavior observed at about 92 K.

Critical magnetic fields are significantly reduced.

Coexistence of superconductivity and magnetism demonstrated.

Abstract

We present a study of reentrant behavior in a composite formed by a Hight-T$ _{c} $ superconductor, YBa$_2$Cu$_3$O$ _{7-\delta}$ and Ammonium Terbium Oxalate, Tb(H$_2$O)(C$ _2$O$_4$)$_2$ $\cdot $NH$_4$. The composite has a transition temperature about 92 K, and it presents a reentrant behaviour resulting of the coexistence between superconductivity and magnetism. According to this study the values and shape of the critical magnetic fields were dramatically reduced in a similar form as in other known reentrant superconductors.