Superconductivity in 5d transition metal Laves phase SrIr2
Superconductivity in 5d transition metal Laves phase SrIr2
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DOI：
10.1088/1361-648x/ab6a2e
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发表时间：
2020-04-24
影响因子：
2.7
通讯作者：
Akimitsu, J.
中科院分区：
文献类型：
--
作者：
Horie, R.;Horigane, K.;Akimitsu, J.
本文报道了具有立方MgCu_2结构的Laves相超导体SrIr_2的超导性质。SrIr 2是一种II型超导体，其Tc为5.9 K。估算了下临界场μ H-0（c_1）和上临界场μ H-0（c_2）的超导参数，相干长度xi（0），穿透深度λ（0）和Ginzburg-Landau（GL）参数kappa（0），约为μ H-0（c_1）= 101 Oe，μ H-0（c_2）（0）= 5.9T，xi（0）= 7.47nm，λ（0）= 237 nm，kappa（0）= 31.7。比热数据表明，SrIr 2是一种强耦合超导体，因为Δ C/γ T-c的值约为1.71，这比BCS理论预期的1.43大。本研究中得到的物理性质很好地解释了理论计算，包括自旋轨道耦合（SOC）。该结果表明，SrIr 2的物理性质受到SOC存在的强烈影响。
We report here the superconducting properties of a Laves phase superconductor SrIr2, which has a cubic MgCu2 structure. SrIr2 is a type-II superconductor, with a T-c of 5.9 K. The estimated superconducting parameters of lower critical field mu H-0(c1) and upper critical field mu H-0(c2), coherence length xi(0), penetration depth lambda(0) and Ginzburg-Landau (GL) parameter kappa(0) are approximately mu H-0(c1) = 101 Oe, mu H-0(c2)(0) = 5.9 T, xi(0) = 7.47 nm, lambda(0) = 237 nm, and kappa(0) = 31.7, respectively. The specific-heat data indicate that SrIr2 is a strong-coupling superconductor because the value of Delta C/gamma T-c is approximately 1.71, which is larger than the value of 1.43 that is expected from the BCS theory. The physical properties obtained in this study are explained well by theoretical calculations including spin-orbit coupling (SOC). This result indicates that the physical properties of SrIr2 are strongly affected by the presence of SOC.