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Enhanced superconductivity and vortex glass–liquid transition in single-crystalline Nb-doped FeSe0.5Te0.5
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DOI：10.1088/1361-6668/ae534c.png)
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Abstract
En 中文
We present a systematic study of the superconducting properties and vortex glass–liquid transition in single-crystalline Nb-doped FeSe0.5Te0.5. Niobium (Nb) was introduced up to 10 wt.% (x= 0, 0.03, 0.04, 0.05, 0.06, and 0.1) to examine the effect on the structural, magnetic, and electrical properties of FeSe0.5Te0.5 superconductor. The incorporation of Nb into Fe1−xNbxSe0.5Te0.5 increases the superconducting transition temperature Tconset from 14.4 to 15.8 K for x = 0.05. The critical current density is found to increase upon Nb doping, indicating enhanced flux pinning strength in Nb-doped Fe1−xNbxSe0.5Te0.5. Temperature-dependent resistivity measurements under various magnetic fields, ρ(T, B), reveal a maximum upper critical field (Bc2) of 245.56 T for the x = 0.05 sample. The ρ (T, B) data display scaling behavior consistent with the vortex-glass model, with exponents s = 2.23 for B//c and 4.96 for B//ab in the x = 0.05 sample. Analysis of thermally activated flux flow and the associated activation energy reveals strong anisotropy and robust vortex dynamics. These results clarify how Nb doping influences vortex phase behavior and provide deeper insights into vortex matter in Fe-based superconductors.
Keywords:
Nb doping
superconductivity
vortex glass–liquid transition
critical current density
flux pinning
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