Intrinsic Nature of Spontaneous Magnetic Fields in Superconductors with Time-Reversal Symmetry Breaking,Physical Review Letters

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Intrinsic Nature of Spontaneous Magnetic Fields in Superconductors with Time-Reversal Symmetry Breaking
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-12-01 , DOI: 10.1103/physrevlett.127.237002
B M Huddart ₁ , I J Onuorah ₂ , M M Isah ₂ , P Bonfà ₂ , S J Blundell ₃ , S J Clark ₁ , R De Renzi ₂ , T Lancaster ₁

Affiliation

We present a systematic investigation of muon-stopping states in superconductors that reportedly exhibit spontaneous magnetic fields below their transition temperatures due to time-reversal symmetry breaking. These materials include elemental rhenium, several intermetallic systems, and

{Sr}_{2} {RuO}_{4}

. We demonstrate that the presence of the muon leads to only a limited and relatively localized perturbation to the local crystal structure, while any small changes to the electronic structure occur several electron volts below the Fermi energy, leading to only minimal changes in the charge density on ions close to the muon. Our results imply that the muon-induced perturbation alone is unlikely to lead to the observed spontaneous fields in these materials, whose origin is more likely intrinsic to the time-reversal symmetry-broken superconducting state.

中文翻译：

具有时间反转对称性破缺的超导体中自发磁场的内在性质

我们对超导体中的介子停止状态进行了系统的研究，据报道，由于时间反转对称性破坏，超导体表现出低于其转变温度的自发磁场。这些材料包括元素铼、几种金属间化合物和

锶_{2} {氧化钌}_{4}

. 我们证明了 μ 子的存在仅导致对局部晶体结构的有限且相对局部的扰动，而电子结构的任何微小变化都发生在费米能量以下几个电子伏特处，导致电荷密度的变化很小μ子附近的离子。我们的结果意味着，单独的介子引起的扰动不太可能导致在这些材料中观察到的自发场，其起源更可能是时间反转对称性破坏的超导状态所固有的。

更新日期：2021-12-01

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