C-axis electrical resistivity of PrO1−aFaBiS2 single crystals. (24th July 2015)

• Record Type: Journal Article
• Authors: Nagao, Masanori; Miura, Akira; Watauchi, Satoshi; Takano, Yoshihiko; Tanaka, Isao
• Is Part Of: Japanese journal of applied physics. Volume 54:Number 8(2015:Aug.)
• Publication Date: 2015-07-24
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.54.083101
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: The high anisotropy in RO1− a F a BiS2 (R denotes a rare-earth element) superconductors demonstrates their potential use as intrinsic Josephson junctions, considering the weak coupling among BiS2 –PrO(F)–BiS2 (superconducting–normal–superconducting) layers along the c -axis. We grew PrO1− a F a BiS2 single crystals using CsCl/KCl flux. The superconducting anisotropies of the grown single crystals were estimated to be approximately 40–50 from the effective mass model. The c -axis transport properties were characterized using single-crystal s-shaped intrinsic Josephson junctions with a focused ion beam. Along the c -axis, the crystals showed zero resistivity at 2.7 K and a critical current density of 1.33 × 10 3 A/cm 2 at 2.0 K. The current–voltage curve along the c -axis displayed hysteresis. The c -axis transport measurements under a magnetic field parallel to the ab -plane revealed a "lock-in" state due to the Josephson vortex flow, indicating that BiS2 superconductors are promising candidates for intrinsic Josephson junctions.