Critical current densities and flux creep rates in near optimally doped BaFe2−xRuxAs2 (x≈0.7) single crystals. (April 2016)

• Record Type: Journal Article
• Authors: Haberkorn, N.; Eom, Man Jin; You, Jung Sang; Kim, Jeehoon; Kim, Jun Sung
• Is Part Of: Solid state communications. Volume 231/232(2016)
• Page Start: 26
• Page End: 30
• Publication Date: 2016-04
• Subjects: A. Superconductors -- B. Flux pinning and creep; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2016.01.020
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We present an investigation of the critical current densities J c and flux creep rates in a near optimally doped BaFe2− x Ru x As2 ( x ≈0.7) single crystal by (measuring magnetization). The superconducting critical temperature is 18 K. The in-field dependences of the critical current density J c 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 ( μ 0 H =0.1 T) is well described through a glassy exponent μ =1.9 and a collective pinning energy ( U 0 ) smaller than 100 K. Highlights: Vortex dynamics for a BaFe2− x Ru x As2 ( x ≈0.7) single crystal is reported. J c at low magnetic fields is well explained by low density of strong pinning centers. The collective pinning energy and the glassy μ exponent were estimated.