具有蜂巢网络的 BaPtAs_1-x_Sb_x_ 中的自发磁场和无序效应

T. Adachi, T. Ogawa, Y. Komiyama, T. Sumura, Y. Saito-Tsuboi, T. Takeuchi, K. Mano, K. Manabe, K. Kawabata, T. Imazu, A. Koda, W. Higemoto, H. Okabe, J. G. Nakamura, T. U. Ito, R. Kadono, C. Baines, I. Watanabe, Y. Imai, J. Goryo, M. Nohara, K. Kudo
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摘要

手性超导性表现为新型电子对的形成打破了时间反转对称性,近年来人们一直在积极研究各种量子材料。然而,尽管手性超导具有提供直观信息的潜力,但晶体结构的无序性对手性超导的影响尚未得到阐明,因此使用固溶体系统进行研究是可取的。我们报告了具有由铂和(砷、锑)组成的蜂窝网络的层状锑化钡(BaPtAs_1-x_Sb_x_)的μ介子-自旋-松弛(muSR)结果。我们观察到,在 x=1.0 的锑端,超导(SC)态的零场μ介子-自旋弛豫速率增加了,这表明由于 SC 态的时间反向对称性破缺,出现了自发磁场。另一方面,在 x=0.9 和 0.2 的砷锑混合样品中,自发磁场分别被几乎和完全抑制,这表明 x=1.0 的时间逆对称破缺 SC 态对无序很敏感。在 x=1.0 和 0.2 时,通过横向场 muSR 测量估算出的磁穿透深度表现为弱耦合 s 波超导。对于 x=1.0 的 BaPtAs_1-x_Sb_x_ 的零场和横向场 muSR 结果,可以从三维费米面上具有点节点的手性 d 波超导现象来理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network
Chiral superconductivity exhibits the formation of novel electron pairs that breaks the time-reversal symmetry and has been actively studied in various quantum materials in recent years. However, despite its potential to provide definitive information, effects of disorder in the crystal structure on the chiral superconductivity has not yet been clarified, and therefore the investigation using a solid-solution system is desirable. We report muon-spin-relaxation (muSR) results of layered pnictide BaPtAs_1-x_Sb_x_ with a honeycomb network composed of Pt and (As, Sb). We observed an increase of the zero-field muon-spin relaxation rate in the superconducting (SC) state at the Sb end of x=1.0, suggesting the occurrence of spontaneous magnetic field due to the time-reversal symmetry breaking in the SC state. On the other hand, spontaneous magnetic field was almost and completely suppressed for the As-Sb mixed samples of x=0.9 and 0.2, respectively, suggesting that the time-reversal symmetry breaking SC state in x=1.0 is sensitive to disorder. The magnetic penetration depth estimated from transverse-field muSR measurements at x=1.0 and 0.2 behaved like weak-coupling s-wave superconductivity. These seemingly incompatible zero-field and transverse-field muSR results of BaPtAs_1-x_Sb_x_ with x=1.0 could be understood in terms of chiral d-wave superconductivity with point nodes on the three-dimensional Fermi surface.
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