非中心对称超导体NbGe₂的μSR研究
$μ$SR study on noncentrosymmetric superconductor NbGe$_{\mathbf{2}}$
AI总结：
本研究通过μ子自旋弛豫技术探究非中心对称超导体NbGe₂，证实其超导态保持时间反演对称性，绘制出相图并明确了I型与II型超导性共存的区域。
摘要：
我们报道了一项针对多晶非中心对称超导体NbGe₂的μ子自旋弛豫（μSR）研究，该超导体的超导转变温度Tc为2.0~2.1 K。零场μSR实验表明，超导态中不存在自发磁场，说明超导态中时间反演对称性得以保持。我们开展了横向场μSR实验以绘制NbGe₂的相图，从中获得了I型和II型超导性的明确证据。更重要的是，我们清晰划定了相图中I型与II型超导性共存的区域。
英文摘要：
We report a muon spin relaxation ($μ$SR) study on polycrystalline noncentrosymmetric superconductor NbGe$_2$~with the superconducting transition temperature $T_c=2.0\sim2.1$~K. Zero-field $μ$SR~experiment indicates the absence of spontaneous magnetic field in the superconducting state, showing the preservation of time-reversal symmetry in the superconducting state. Transverse-field $μ$SR~experiment is performed to map the phase diagram of NbGe$_2$, from which clear evidence of both type-I and type-II superconductivity is obtained. More importantly, we clearly delineate the region in the phase diagram where type-I and type-II superconductivity coexist.
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