论文标题
$ \ mathrm {sr} _ {2} \ mathrm {ru} \ mathrm {o} _ {4}
Inhomogeneous time-reversal symmetry breaking in $\mathrm{Sr}_{2}\mathrm{Ru}\mathrm{O}_{4}$
论文作者
论文摘要
我们表明，在$ \ mathrm {srm {sr} _ {2} \ Mathrm {ru} \ Mathrm {o} _ {O} _ {4} $中，观察到的超导状态的时间反转对称破坏（TRSB）可以理解为源于近距离菌株近端的cystractions cystrail cystrains scyst cystrains of inhomogeenos carteragations。具体来说，我们认为，如果没有拉伤不均匀性，$ \ mathrm {sr} _ {2} \ mathrm {ru} \ Mathrm {o} _ {4} $是单个单位，时间 - 逆向对称的超级对手，可能与$ d_} $ d_ {2} 2} $ d_ {2} - } {2} - 然而，由于位错产生的强菌株不均匀性，缓慢的子领先配对状态在样本的重要部分中有助于凝结。随着它在错位周围缠绕时，时间反转对称性被局部损坏。全局相位锁定和TRSB发生在一个尖锐的Ising转变处，并不伴随单粒子间隙的变化，并产生非常小的热容量异常。因此，我们的模型解释了在紧张的样品中TRSB过渡时缺乏可测量的热容量异常，以及通过MUON自旋旋转实验探测的时间反转对称性破裂状态的稀释性质。我们提出，材料的塑性变形可用于操纵破碎的时间反转对称性的发作。
We show that the observed time-reversal symmetry breaking (TRSB) of the superconducting state in $\mathrm{Sr}_{2}\mathrm{Ru}\mathrm{O}_{4}$ can be understood as originating from inhomogeneous strain fields near edge dislocations of the crystal. Specifically, we argue that, without strain inhomogeneities, $\mathrm{Sr}_{2}\mathrm{Ru}\mathrm{O}_{4}$ is a single-component, time-reversal symmetric superconductor, likely with $d_{x^{2}-y^{2}}$ symmetry. However, due to the strong strain inhomogeneities generated by dislocations, a slowly-decaying sub-leading pairing state contributes to the condensate in significant portions of the sample. As it phase winds around the dislocation, time-reversal symmetry is locally broken. Global phase locking and TRSB occur at a sharp Ising transition that is not accompanied by a change of the single-particle gap and yields a very small heat capacity anomaly. Our model thus explains the puzzling absence of a measurable heat capacity anomaly at the TRSB transition in strained samples, and the dilute nature of the time-reversal symmetry broken state probed by muon spin rotation experiments. We propose that plastic deformations of the material may be used to manipulate the onset of broken time-reversal symmetry.
