Dirac surface states and nature of superconductivity in Noncentrosymmetric BiPd

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Title
Dirac surface states and nature of superconductivity in Noncentrosymmetric BiPd
Author(s)
Zhixiang Sun; Mostafa Enayat; Ana Maldonado; Calum Lithgow; Ed Yelland; Darren C. Peets; Alexander Yaresko; Andreas P. Schnyder; Peter Wahl
Publication Date
2015-03
Journal
NATURE COMMUNICATIONS, v.6, no., pp.6633 -
Publisher
NATURE PUBLISHING GROUP
Abstract
In non-magnetic bulk materials, inversion symmetry protects the spin degeneracy. If the bulk crystal structure lacks a centre of inversion, however, spin-orbit interactions lift the spin degeneracy, leading to a Rashba metal whose Fermi surfaces exhibit an intricate spin texture. In superconducting Rashba metals a pairing wavefunction constructed from these complex spin structures will generally contain both singlet and triplet character. Here we examine the possible triplet components of the order parameter in noncentrosymmetric BiPd, combining for the first time in a noncentrosymmetric superconductor macroscopic characterization, atomic-scale ultra-low-temperature scanning tunnelling spectroscopy, and relativistic first-principles calculations. While the superconducting state of BiPd appears topologically trivial, consistent with Bardeen-Cooper-Schrieffer theory with an order parameter governed by a single isotropic s-wave gap, we show that the material exhibits Dirac-cone surface states with a helical spin polarization. ©2015 Macmillan Publishers Limited. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/2093
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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