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Exploring superconductivity using muon spin resonance in chiral noncentrosymmetric superconductors.

ORAL

Abstract

Unconventional superconductivity remains one of the most interesting problems in condensed matter physics. For all superconductors, the topology of the electronic band structure, along with the underlying crystal structure, play vital roles in determining the superconducting properties of the material. Systems lacking a centre of inversion exhibit a nonuniform lattice potential, giving rise to a Rashba-type antisymmetric spin-orbit coupling which allows for an admixture of singlet and triplet pairs. This may give rise to exotic superconducting band structures and magnetoelectric effects such as upper critical fields that exceed the Pauli limit. The discovery of two noncentrosymmetric superconductors with chiral structures, TaRh2B2 and NbRh2B2 [1], has added a new twist to an already exciting area of superconductivity. Here we present our investigation into the superconducting order parameter using muon spin resonance techniques in TaRh2B2 and NbRh2B2 [2, 3].

[1] E. M Carnicom et al., Sci. Adv. 4 eaar7969 (2018).
[2] D. A. Mayoh et al., Phys. Rev. B 98, 014502 (2018).
[3] D. A. Mayoh et al. J. Phys.: Condens. Matter 31 465601 (2019).

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Presenters

  • Daniel Mayoh

    Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

Authors

  • Daniel Mayoh

    Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

  • Matthew Pearce

    Physics, Warwick University, Physics, University of Warwick, University of Warwick, Department of Physics, University of Warwick, Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

  • Kathrin Goetze

    HLD (HZDR) / TU Dresden, Physics, Warwick University, Physics, University of Warwick, University of Warwick, Department of Physics, University of Warwick, Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

  • Adrian Hillier

    Rutherford Appleton Lab, ISIS Neutron and Muon Sources, Science & Technology Facilities Council, ISIS facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire OX11 0QX, United Kingdom

  • Geetha Balakrishnan

    University of Warwick, Department of Physics, University of Warwick, Physics, University of Warwick, Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

  • Martin Lees

    Univ of Warwick, University of Warwick, Department of Physics, University of Warwick, Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom