Critical current densities and flux creep rates in near optimally doped BaFe2−xRuxAs2 (x ~ 0.7) single crystals

N. HABERKORN; MAN JIN EOM; JUNG SANG YOU; JEEHOON KIM; JUN SUNG KIM

SOLID STATE COMMUNICATIONS

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 vol. 231 p. 26 - 30

0038-1098

We present an investigation of the critical current densities Jc and flux creep rates in a near optimally doped BaFe2−xRuxAs2 (x  0.7) single crystal by (measuring magnetization). The superconducting critical temperature is 18 K. The in-field dependences of the critical current density Jc are due to a mixed pinning scenario produced mainly by large precipitates and a less significant contribution of random disorder. Furthermore, a Maley analysis in the regime dominated by strong pinning centers (u0H = 0.1 T) is well described through a glassy exponent μ = 1.9 and a collective pinning energy (U0) smaller than 100 K.