Dynamics of trapped magnetic flux in superconducting FeTe0.65Se0.35
S.I. Bondarenko1, A.N. Bludov1, V.P. Koverya1, S.I. Link1, A.G. Sivakov1, V.P. Timofeev1, D.J. Gawryluk2,3, R. Puźniak2, and A. Wiśniewski2
1B. Verkin Institute for Low Temperature Physics and Engeneering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
2Institute of Physics, Polish Academy of Sciences, 32/46 Aleja Lotników, Warsaw PL-02668, Poland
3Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institute CH-5232 Villigen PSI, Switzerland
Received March 27, 2017, revised April 20, 2017
The magnetic moment in the superconducting and normal state of a crystalline FeTe0.65Se0.35 superconductor, grown by the Bridgman’s method with relatively high growth rate, was measured. The temperature and magnetic field dependences of magnetization and its relaxation time were determined. Studied crystal, being non-uniform due to high growth rate of 5 mm/h, exhibits smaller width of superconducting transition in comparison with an ideal crystal grown with velocity of 1 mm/h, and the difference in magnetic properties of crystals grown with various growth rate, related to their microstructure, is discussed.
PACS: 74.25.Ha Magnetic properties; PACS: 74.25.F– Transport properties; PACS: 74.70.Xa Pnictides and chalcogenides.
Key words: iron-based superconductor, magnetic moment, pinning potential, critical current, anisotropy of properties.