Premium
Electrical transport properties of a superconductor–ferrimagnet composite in applied magnetic fields
Author(s) -
Kalanda Nikolai A.,
Yarmolich Marta V.,
Sobolev Nikolai A.
Publication year - 2016
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600526
Subject(s) - ferrimagnetism , condensed matter physics , magnetoresistance , electrical resistivity and conductivity , superconductivity , composite number , materials science , magnetic field , atmospheric temperature range , transition temperature , magnetization , physics , composite material , thermodynamics , quantum mechanics
Electrical transport properties of the YBa 2 Cu 3 O 7− δ + Sr 2 FeMoO 6− δ superconductor–ferrimagnet composite as a function of the temperature and applied magnetic field are reported. Four different intervals in the temperature dependence of the resistivity have been found between room temperature and 4.2 K. In the temperature range from 300 K down toT c 1a semiconducting behavior is observed, whereas belowT c 1the first transition into a superconducting state sets in. Upon further cooling down, the semiconducting behavior appears again belowT min < T c 1and then a second superconducting transition starts atT c 2 < T mincontinuing down to 4.2 K. The magnetoresistance is negative aboveT c 1and positive below it, achieving at 5 K and a field of 10 T a huge value of ∼5700%. We discuss the role of the weak links between the YBa 2 Cu 3 O 7− δ grains represented by the Sr 2 FeMoO 6− δ interlayers on the magnetotransport in the composite. Temperature dependence of the electrical resistivity of the YBCO + 0.05 SFMO composite measured in different applied magnetic fields, where the temperaturesT c 1 ( 0 ) , T c 2 ( 0 ) , T min ( 0 )refer to zero field, B = 0 T ; T c 1 ( 5 ) , T c 2 ( 5 ) , T min ( 5 ) t o B = 5 T ; andT c 1 ( 10 ) , T c 2 ( 10 ) , T min ( 10 ) t o B = 10 T .