期刊
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
卷 35, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6668/ac3632
关键词
anisotropic critical current density; flux pinning mechanism; Fe1+yTe0.6Se0.4; magnetic relaxation
资金
- National Key RAMP
- D Program of China [2018YFA0704300]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB25000000]
- National Natural Science Foundation of China [U1932217, 51861135104]
Fe1+yTe0.6Se0.4 shows great potential for applications due to its high critical current density (J(c)) and upper critical magnetic field (H-c2). However, the anisotropy of J(c) and the flux-pinning mechanism remain unclear. In this study, the anisotropy of J(c) in Fe1+yTe0.6Se0.4 was observed, and the origin of the anisotropy was discussed. The relationship between the pinning force density (F-p) and the field was analyzed, revealing a non-scaling behavior. The dominant pinning type in Fe1+yTe0.6Se0.4 was confirmed to be normal point pinning based on vortex dynamics analysis.
Fe1+yTe0.6Se0.4 has considerable application potential due to its large critical current density (J(c)) and high upper critical magnetic field (H-c2). However, the uncertainty of the anisotropy of J(c) and the unclear flux-pinning mechanism have limited the application of this material. In this study, the J(c) in three directions were obtained from magnetic hysteresis loop measurements. A large anisotropy of J(c)(ab)/T-c(c) similar to 10 was observed, and the origin of the anisotropy was discussed in details. Flux pinning force densities (F-p) were obtained from J(c), and a non-scaling behavior was found in the normalized pinning force f(p) [F-p/Fp-max] versus the normalized field h[H/H-c2]. The peaks of pinning force shift from a high h to a low h with increasing temperature. Based on the vortex dynamics analysis, the peak shift was found to originate from the magnetization relaxation. The J(c) and F-p at critical states free from the magnetic relaxation were regained. According to the Dew-Hughes model, the dominant pinning type in Fe1+yTe0.6Se0.4 clean single crystals was confirmed to be normal point pinning.
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