Anisotropy of spontaneous magnetic field in chiral superconductor

カイラル超伝導体における自発磁化異方性

髭本 亘  ; 岡澤 赳*; 網田 裕斗; 宮崎 一輝*; 伊藤 孝   ; 吉田 良行*

Higemoto, Wataru; Okazawa, Takeshi*; Oda, Yuto; Miyazaki, Itsuki*; Ito, Takashi; Yoshida, Yoshiyuki*

In a chiral superconductor, time reversal symmetry of Cooper pair breaks and spontaneous magnetic field can be generated in a superconducting phase. One of the possible source of the spontaneous magnetic field is current at the domain edges. Such the edge current is related to total orbital angular momentum of Cooper pairs and have been studied in chiral superconductors. Although spontaneous magnetic field is a key feature for understanding of chiral superconductivity, details are not known up to now. In SrRuO, time reversal symmetry broken superconductivity is proposed. We have investigated anisotropy of spontaneous magnetic field in SrRuO by using zero field muon spin relaxation (ZF-SR) technique. In superconducting phase, spontaneous magnetic fields were observed for all the directions. We will present anisotropy of spontaneous field based on our results of ZF-SR in SrRuO.