arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1507.07451cond-mat.supr-con
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A $_2$ Cr $_3$ As $_3$中$p_z$波自旋三重态超导性的实验结果

Experimental consequences of $p_z$-wave spin triplet superconductivity in A$_2$Cr$_3$As$_3$

Xianxin Wu, Fan Yang, Shengshan Qin, Heng Fan, Jiangping Hu

摘要:

研究了Wu { \em et al.}提出的三重态$p_z$ -波配对态的实验观测性质。[arXiv:1503.06707]在准一维A $_2$ Cr $_3$作为$_3$材料,进行了理论研究。这种配对状态的特征在于费米表面上的$k_z=0$平面上的线节点。基于三带紧束缚模型,我们得到了比热、超流密度、Knight位移和自旋弛豫速率,发现低温下($T\ll T_c$)这些性质都呈现幂律行为,与现有实验一致.特别地,在这个准一维系统中,由$p_z$ -波配对态决定的超流密度是各向异性的:在低温下,面内超流密度为$Δρ_{\parallel}\sim T$,而面外超流密度为$Δρ_{\perp}\sim T^3$.实验中报道的各向异性上临界场与$S_z=0$一致(即,$(\uparrow\downarrow+\downarrow\uparrow)$)$p_z$ -波配对状态。我们还建议用相敏dc-SQUID测量来确定三重态$p_z$波配对态。

英文摘要:

The experimental observable properties of the triplet $p_z$-wave pairing state, proposed by Wu {\em et al.} [arXiv:1503.06707] in quasi-one dimensional A$_2$Cr$_3$As$_3$ materials, are theoretically investigated. This pairing state is characterized by the line nodes on the $k_z=0$ plane on the Fermi surfaces. Based on the three-band tight binding model, we obtain the specific heat, superfluid density, Knight shift and spin relaxation rate and find that all these properties at low temperature ($T\ll T_c$) show powerlaw behaviors and are consistent available experiments. Particularly, the superfluid density determined by the $p_z$-wave pairing state in this quasi-one dimensional system is anisotropic: the in-plane superfluid density varies as $Δρ_{\parallel}\sim T$ but the out-plane one varies as $Δρ_{\perp}\sim T^3$ at low temperature. The anisotropic upper critical field reported in experiment is consistent with the $S_z=0$ (i.e., $(\uparrow\downarrow+\downarrow\uparrow)$) $p_z$-wave pairing state. We also suggest the phase-sensitive dc-SQUID measurements to pin down the triplet $p_z$-wave pairing state.

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