Superconductivity in CaSn3 single crystals with a AuCu3-type structure

Superconductivity in CaSn3 single crystals with a AuCu3-type structure
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AuCu3 型结构的 CaSn3 单晶的超导性

DOI:
10.1039/c5tc02373d
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发表时间:
2015-10
影响因子:
6.4
通讯作者:
Sun, Y. P.
Sun, Y. P.
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhu, X. B.;Song, W. H.;Lu, W. J.;Sun, Y. P.

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本文报道了具有AuCu_3型结构的CaSn_3单晶体的超导电性,即立方空间群Pmm。超导转变温度TC = 4.2 K是由磁化率,电阻率和热容测量。低温下磁化强度-磁场(M-H)曲线表现出典型的II型超导行为。估计的下临界场和上临界场分别约为125 Oe和1.79 T。根据Ginzburg-Landau方程计算出激光的穿透深度λ(0)和相干长度λ(0)分别约为1147 nm和136 nm。正常态γN的索末菲系数估计约为2.9 mJ mol−1 K−2。ΔC/γNTC = 1.13,λep = 0.65,表明CaSn_3单晶是弱耦合超导体。电子能带结构的计算表明,在费米能级处存在一个由三个能带组成的复杂的多片费米面,且态密度较低,这与实验结果一致.通过对AX 3化合物(A = Ca,La,Y; X = Sn,Pb)的电子-声子耦合的分析,从理论上提出了一种提高体系TC的方法。
We report the superconductivity of CaSn3 single crystals with a AuCu3-type structure, namely cubic space group Pmm. The superconducting transition temperature TC = 4.2 K is determined by the magnetic susceptibility, electrical resistivity, and heat capacity measurements. The magnetization versus magnetic field (M–H) curve at low temperatures shows a typical-II superconducting behavior. The estimated lower and upper critical fields are about 125 Oe and 1.79 T, respectively. The penetration depth λ(0) and coherence length ξ(0) are calculated to be approximately 1147 nm and 136 nm by the Ginzburg–Landau equations. The estimated Sommerfeld coefficient of the normal state γN is about 2.9 mJ mol−1 K−2. ΔC/γNTC = 1.13 and λep = 0.65 suggest that the CaSn3 single crystal is a weakly coupled superconductor. Electronic band structure calculations show a complex multi-sheet Fermi surface formed by three bands and a low density of states (DOSs) at the Fermi level, which is consistent with the experimental results. Based on the analysis of electron–phonon coupling of AX3 compounds (A = Ca, La, and Y; X = Sn and Pb), we theoretically proposed a way to increase TC in the system.
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