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Pressure‐Enhanced Superconductivity in EuSr 2 Bi 2 S 4− x Se x F 4 and Eu 2 SrBi 2 S 4− x Se x F 4 ( x = 1.5, 2)
Author(s) -
Nallathambi Subbulakshmi,
Ganesan Kalaiselvan,
Haque Zeba,
Gupta Laxmi Chand,
Ganguli Ashok Kumar,
Sonachalam Arumugam
Publication year - 2019
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.201800603
Subject(s) - superconductivity , hydrostatic pressure , magnetization , condensed matter physics , critical field , critical current , superconducting transition temperature , materials science , physics , magnetic field , thermodynamics , quantum mechanics
The dc magnetization of Se‐doped Eu 2 SrBi 2 S 4− x Se x F 4 and EuSr 2 Bi 2 S 4− x Se x F 4 ( x = 1.5 and 2) superconductors is measured under external hydrostatic pressure. All the samples exhibit an enhanced superconducting transition temperature ( T c ) upto ≈1 GPa. There is a possible crystallographic transformation by the application of pressure from a structure of low T c to a structure corresponding to high T c . The maximum T c of ≈3.4 K is observed in EuSr 2 Bi 2 S 2 Se 2 F 4 (positive pressure coefficient 1.08 K GPa −1 ). Critical current density J c = 0.38 × 10 4 A cm −2 at 2 K (1 GPa) upto 0.05 T is estimated using Bean's model. EuSr 2 Bi 2 S 2 Se 2 F 4 has lower critical field ( H c1 ) ≈100 Oe. To our knowledge, this is the first report of pressure‐dependent critical current density with application of magnetization studies in Eu‐3244‐based superconducting materials. This work devotes the effort to establish the commonality of pressure effect on the BiS 2 ‐based superconductors, and also uncovers the importance of electron carrier density in the high‐ T c phase.