M. Kriener, Kouji Segawa, Satoshi Sasaki, Yoichi Ando
CuxBi2Se3 was recently elucidated to be 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 Tc 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 further support to the novel odd-parity pairing state in CuxBi2Se3.
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http://arxiv.org/abs/1206.6260
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