期刊
PHYSICAL REVIEW B
卷 85, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.214526
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资金
- AFOSR MURI
- US Department of Energy, Office of Basic Energy Sciences, Division ofMaterials Sciences and Engineering [DE-AC02-07CH11358]
We present evidence of type-I superconductivity in YbSb2 single crystals from dc and ac magnetization, heat capacity, and resistivity measurements. The critical temperature and critical field are determined to be T-c approximate to 1.3 K and H-c approximate to 55 Oe. A small Ginzburg-Landau parameter kappa = 0.05, together with typical magnetization isotherms of type-I superconductors, small critical field values, a strong differential paramagnetic effect signal, and a field-induced change from second- to first-order phase transition, confirms the type-I nature of the superconductivity in YbSb2. A possible second superconducting state is observed in the radio-frequency susceptibility measurements, with T-c((2)) approximate to 0.41 K and H-c((2)) approximate to 430 Oe.
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