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arXiv 0908.1304cond-mat.supr-con
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立方ThPt4Ge12中可能的各向异性超导配对

Possible anisotropic superconducting pairing in cubic ThPt4Ge12

V. H. Tran, A. D. Hillier, D. T. Adroja, D. Kaczorowski

摘要:

对多晶ThPt 4Ge 12进行了横向场μ子自旋旋转测量。测得该化合物涡旋态的磁穿透深度$λ$和超导相干长度$ξ$分别为112(5)nm和32(2)nm。我们估计了准粒子$m^* \approx 4.6\times m_e$的有效质量,超流载流子密度$n_s \approx 1.02 \times 10^{28}$ carriers/m $^{3}$,零温超导带隙为0.67 meV,对应于比率:2 $Δ(0)/k_BT_c$ = 3.76。在不可逆温度$T_{ir} \sim $ 2.5 K以下,我们发现涡旋态μ子自旋弛豫速率ZFC-和FC- $σ_s(T)$的温度依赖性有显著差异。线性场依赖性的$λ(H)$,小比例$T_{ir}/T_c$,和幂律行为的温度依赖性的$λ(T)$似乎是一致的各向异性超导配对的化合物研究。在Uemura分类框架下,对超导转变温度与有效费米温度的相关性分析表明,ThPt 4Ge属于同一类奇异超导体。

英文摘要:

Transverse-field muon-spin-rotation measurements have been carried out for polycrystalline ThPt4Ge12. The magnetic penetration depth $λ$ and the superconducting coherence length $ξ$ in the vortex state of this compound were found to be 112(5) nm and 32(2) nm, respectively. We have estimated the effective mass of the quasiparticles $m^* \approx 4.6\times m_e$, the superfluid carrier density $n_s \approx 1.02 \times 10^{28}$ carriers/m$^{3}$, and the zero-temperature superconducting gap 0.67 meV, corresponding to the ratio: 2$Δ(0)/k_BT_c$ = 3.76. We found markable difference between the temperature dependence of the vortex state muon-spin relaxation rate ZFC- and FC-$σ_s(T)$ below the irreversibility temperature $T_{ir} \sim $ 2.5 K. Linear field dependence of $λ(H)$, small ratio $T_{ir}/T_c$, and power law behavior of the temperature dependencies of $λ(T)$ seem to be consistent with anisotropic superconducting pairing in the compound studied. The analysis of correlation between the superconducting transition temperature and the effective Fermi temperature within the Uemura classification scheme reveals that ThPt4Ge belongs to the same class of exotic superconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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