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.

arXiv comment5 pages, 4 figures; title has been changed; final version published in Phys. Rev. B, Rapid Communications

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Cited by in corpus (26)

• Topological Insulator Materials
• Colloquium: Topological Band Theory
• Superconductivity with topological surface state in SrxBi2Se3
• Unusual nature of fully-gapped superconductivity in In-doped SnTe
• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Fermiology of Strongly Spin-Orbit Coupled Superconductor Sn1-xInxTe and its Implication to Topological Superconductivity
• Anomalous dressing of Dirac fermions in the topological surface state of Bi2Se3, Bi2Te3, and CuxBi2Se3
• Robust odd-parity superconductivity in the doped topological insulator Nb${}_x$Bi${}_2$Se${}_3$
• Bulk electronic state of superconducting topological insulator
• 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${}_3$
• Surface electronic state of superconducting topological crystalline insulator
• Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor La${}_7$Ni${}_3$
• Observation of Two-Dimensional Bulk Electronic States in a Superconducting Topological Insulator Heterostructure Cux(PbSe)5(Bi2Se3)6: Implications for Unconventional Superconductivity
• Nodeless superconductivity in Ir${}_{1-x}$Pt${}_x$Te${}_2$ with strong spin-orbital coupling
• Doping-dependent charge dynamics in CuxBi2Se3
• Effect of Fermi surface evolution on superconducting gap in superconducting topological insulator
• Power-law Temperature Dependence of the Penetration Depth in a Topological Superconductor due to Surface States
• 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