Abstracts Book - IMRC 2018

• SF1-P008
REENTRANT SUPERCONDUCTIVITY IN A COMPOSITE FORMED
BY YBa2Cu3O7-δ AND AMMONIUM TERBIUM OXALATE.
Rodolfo Ezequiel Lopez Romero 1,2 , Roberto Escudero Derat 3 , Ana Karla Bobadilla Valencia 3
1 Universidad Autónoma Metropolitana, Ciencias Básicas e Ingeniería, Mexico. 2 Universidad
Nacional Autónoma de México, Materia condensada y criogenia, Mexico. 3 Instituto de
Investigaciones en Materiales, Materia condensada y criogenia, Mexico.
We present a study of reentrant behaviour in a composite formed by a Hight-Tc
superconductor, YBa 2 Cu 3 O 7-δ and Ammonium Terbium Oxalate,
Tb(H 2 O)(C 2 O 4 ) 2 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.
Acknowledgment:
This work was supported by DGAPA-UNAM project IT100217 and CONACyT
project 254280. The authors thank to A. Pompa, and A. López for technical help.
Rodolfo E. López-Romero thanks to CONACyT-México for scholarship and Dr. F.
Morales for the substantial suggestions.
Keywords: Superconductivity, Reentrant Superconductors, Superparamagnetism
Presenting authors email: rol_eze@hotmail.com