期刊
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
卷 33, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/ab72c4
关键词
iron-based superconductors; pulsed laser deposition; vortex dynamic; vortex glass; magneto-optical imaging
资金
- National Natural Science Foundation of China [51861135311, U1832213, 51607174]
- Bureau of International Cooperation, Chinese Academy of Sciences [GJHZ1775, 182111KYSB20160014]
- Bureau of Frontier Sciences and Education, Chinese Academy of Sciences [QYZDJ-SSW-JSC026]
- National Key R&D Program of China [2018YFA0704200]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB25000000]
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
We report on the vortex-glass transition and superconducting performance of BaFe1.9Ni0.1As2.05 thin films with T-c = 17.8 K on CaF2(00l) single crystals by pulsed laser deposition. Atomic force microscopy characterization indicates the volumes of droplets appearing on the film surface increase with thickness and Magneto-optical imaging proves slight inhomogeneities in the current flow within the ab-plane of thin film. The thin films show a transport current density J(c) of similar to 1.14 MA cm(-2) in self-field, and 0.34 and 0.28 MA cm (2) for H//c and H//ab up to 9 T at 4.2 K. Pinning mechanism associated with the fluctuations in the mean free path of the charge carries is found to be dominant in the thin films. The vortex-glass (VG) to vortex-liquid phase transition is identified in terms of the plots of the logarithmic derivative of the resistivity curves under different fields, allowing us to deduce the values of the VG transition temperature T-g, and the critical exponent s. The rho-T curves are well scaled by VG theory. A phase diagram combining the VG transition temperature, irreversibility field and upper critical field is constructed.
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