arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.11344cond-mat.supr-con
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自旋-轨道-声子相互作用是螺旋对称破缺自旋三重态超导态的起源

Spin-orbit-phonon interaction as an origin of helical-symmetry breaking spin-triplet superconducting state

Kazumasa Miyake

摘要:

利用$μ$ SR(μ子自旋旋转或弛豫)实验,报道了一系列10个以上化合物超导态的局域场分布宽度$ΔH\equivσ/γ_μ$($γ_μ=135.5\,$ MHz/T为$μ^{+}$的旋磁比)和/或自发磁场$H_{\rm spon}$的过度增加。这些量的大小总体上是1G的量级。我们认为,在这些化合物中,包括具有强的5d电子自旋轨道相互作用的离子,如LaNiGa $_2$中的La或Re $_6$ Zr中的Re,局域场分布$ΔH$的增加是通过准粒子与离子振动(声子)之间的自旋轨道耦合和常规的准粒子-声子耦合的协同作用而实现的,在停止的$μ^{+}$位置周围诱导具有手征超自旋电流的螺旋对称破缺超导态的自旋-三重态p波配对。$ΔH$的大小估计为1G的顺序,与实验观察一致。

英文摘要:

The excess increase of the local field distribution width $ΔH\equivσ/γ_μ$ (with $γ_μ=135.5\,$MHz/T being the gyromagnetic ratio of $μ^{+}$), and/or the spontaneous magnetic field $H_{\rm spon}$, have been reported in the superconducting state of a series of compounds more than 10 by $μ$SR (muon spin rotation or relaxation) experiment. Sizes of these quantities are of the order of 1G on the whole. We propose that the increase of the local field distribution $ΔH$ in those compounds, including ions with strong spin-orbit interaction of 5d electrons, such as La in LaNiGa$_2$ or Re in Re$_6$Zr, is possible through the cooperation of the spin-orbit coupling between the quasiparticles and ionic vibrations (phonons) and the conventional quasiparticles-phonon coupling, inducing the spin-triplet p-wave pairing with helical symmetry breaking superconducting state with chiral super spin current around stopped $μ^{+}$ site. The size of $ΔH$ is estimated as of the order of 1G, in consistent with experimental observations.

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