التفاصيل البيبلوغرافية
| العنوان: |
Time-Reversal Symmetry Breaking Superconductivity in CaSb$_2$ |
| المؤلفون: |
Oudah, M., Cai, Y., Sanchez, M. V. De Toro, Bannies, J., Aronson, M. C., Kojima, K. M., Bonn, D. A. |
| سنة النشر: |
2023 |
| المجموعة: |
Condensed Matter |
| مصطلحات موضوعية: |
Condensed Matter - Superconductivity, Condensed Matter - Materials Science |
| الوصف: |
CaSb$_2$ is a bulk superconductor and a topological semimetal, making it a great platform for realizing topological superconductivity. In this work, we investigate the superconducting upper and lower critical field anisotropy using magnetic susceptibility, and study the superconducting state using muon spin-relaxation. The temperature dependence of transverse-field relaxation rate can be fitted with a single-gap model or two-gap model. Zero-field relaxation shows little temperature dependence when the muon-spin is parallel to the $c*$-axis, while an increase in relaxation appears below 1 K when the muon-spin is parallel to the $ab$-plane. We conclude an $s+is$ order parameter considering the breaking of time-reversal symmetry (TRS), which originates from competing interband interactions between the three bands of CaSb$_2$. To explain the direction-dependent breaking of TRS we suggest loop currents developing in the plane of distorted square-net of Sb atoms. |
| نوع الوثيقة: |
Working Paper |
| URL الوصول: |
http://arxiv.org/abs/2309.12457 |
| رقم الانضمام: |
edsarx.2309.12457 |
| قاعدة البيانات: |
arXiv |