Superconducting Gap Structure of the Noncentrosymmetric Topological Superconductor Candidate HfRuP
Superconducting Gap Structure of the Noncentrosymmetric Topological Superconductor Candidate HfRuP
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DOI：
10.3390/magnetochemistry9050135
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发表时间：
2023-05
期刊：
影响因子：
2.7
通讯作者：
D. Das;D. Adroja;R. Tripathi;Z. Guguchia;F. Hotz;H. Luetkens;Zhijun Wang;Dayu Yan;Huiqian Luo;Youguo Shi
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文献类型：
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作者：
D. Das;D. Adroja;R. Tripathi;Z. Guguchia;F. Hotz;H. Luetkens;Zhijun Wang;Dayu Yan;Huiqian Luo;Youguo Shi
利用横场中的介子自旋旋转/弛豫(μSR)测量，研究了非中心对称六方晶体结构的拓扑超导体候选材料HfRuP的禁带对称性。由Tf-μSR谱得到的超导弛豫速率对温度和磁场的依赖关系可以用各向同性的S波隙来描述。由Tf-−的SR数据计算出超导载流子密度ns=1.4 1(1)×10 2 6mλ3和磁穿透深度μ(0)=6 0 3(2)nm。有趣的是，超导转变温度与超流密度的比值T_c/λ−_2(0)∼_(3.3)与非常规超导体非常接近。此外，我们的零场(ZF)μ自旋共振结果表明，在超导转变温度上下，介子的自旋弛豫没有明显的变化，这表明该超导体的超导态保持了时间-反转对称性。
We investigate the gap symmetry of the topological superconductor candidate HfRuP, which crystallizes in a noncentrosymmetric hexagonal crystal structure, using muon spin rotation/relaxation (μSR) measurements in transverse-field (TF) geometry. The temperature and magnetic field dependencies of the superconducting relaxation rate derived from the TF-μSR spectra can be well described by an isotropic s-wave gap. The superconducting carrier density ns = 1.41(1) × 1026 m−3 and the magnetic penetration depth, λ(0) = 603(2) nm, were calculated from the TF-μSR data. Interestingly, the ratio between the superconducting transition temperature and the superfluid density, Tc/λ−2(0) ∼ 3.3, is very close to those of unconventional superconductors. Further, our zero-field (ZF) μSR results do not show any considerable change in the muon spin relaxation above and below the superconducting transition temperature, suggesting that time-reversal symmetry is preserved in the superconducting state of this superconductor.