セガワ コウジ   SEGAWA KOJI
  瀬川 耕司
   所属   京都産業大学  理学部 物理科学科
   職種   教授
言語種別 英語
発行・発表の年月 2012/11
形態種別 研究論文
標題 Anomalous suppression of the superfluid density in the CuxBi2Se3 superconductor upon progressive Cu intercalation
執筆形態 その他
掲載誌名 PHYSICAL REVIEW B
出版社・発行元 AMER PHYSICAL SOC
巻・号・頁 86(18)
著者・共著者 M. Kriener,Kouji Segawa,Satoshi Sasaki,Yoichi Ando
概要 CuxBi2Se3 was recently found to be likely the first example of a time-reversal-invariant topological superconductor accompanied by helical Majorana fermions on the surface. Here we present that progressive Cu intercalation into this system introduces significant disorder and leads to an anomalous suppression of the superfluid density which was obtained from the measurements of the lower critical field. At the same time, the transition temperature T-c is only moderately suppressed, which agrees with a recent prediction for the impurity effect in this class of topological superconductors bearing strong spin-orbit coupling. Those unusual disorder effects give support to the possible odd-parity pairing state in CuxBi2Se3.
DOI 10.1103/PhysRevB.86.180505
ISSN 1098-0121
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