Anomalous suppression of the superfluid density in the CuxBi2Se3 superconductor upon progressive Cu intercalation

Abstract

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.

5 pages, 4 figures; title has been changed; final version published in Phys. Rev. B, Rapid Communications

References in corpus (6)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Classification of topological insulators and superconductors in three spatial dimensions
• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Electronic Structures and Surface States of Topological Insulator Bi${}_{1-x}$Sb${}_x$
• Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3
• Surface spectral function in the superconducting state of a topological insulator

Cited by in corpus (14)

• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Generalized Anderson's theorem for superconductors derived from topological insulators
• Superconducting doped topological materials
• Direction and symmetry transition of the vector order parameter in topological superconductors Cu${}_x$Bi${}_2$Se${}_3$
• Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor La${}_7$Ni${}_3$
• Doping-dependent charge dynamics in CuxBi2Se3
• Effect of Fermi surface evolution on superconducting gap in superconducting topological insulator
• The effect of interorbital scattering on superconductivity in doped Dirac materials
• Fermiology of possible topological superconductor Tl0.5Bi2Te3 derived from hole-doped topological insulator
• Time-reversal-symmetry Breaking in the Superconducting State of ScS
• Lifshitz transition in dirty nematic superconductor
• Manipulating the nematic director by magnetic fields in the spin-triplet superconducting state of CuxBi2Se3
• Bound states around impurities in a superconducting bilayer
• Sensitivity of superconducting states to the impurity location in layered materials