Abstract
Abstract
Fe
1
+
y
Te0.6Se0.4 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
a
b
/
J
c
c
∼
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
/
F
p-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 Fe
1
+
y
Te0.6Se0.4 clean single crystals was confirmed to be normal point pinning.
Funder
National Natural Science Foundation of China
National Key R&D Program of China
Strategic Priority Research Program of Chinese Acade- my of Sciences
Subject
Materials Chemistry,Electrical and Electronic Engineering,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites
Cited by
4 articles.
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