Field angle dependent vortex lattice phase diagram in MgB2

A. W. D. Leishman, A. Sokolova, M. Bleuel, N. D. Zhigadlo, and M. R. Eskildsen
Phys. Rev. B 103, 094516 – Published 24 March 2021
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Abstract

Using small-angle neutron scattering we have studied the superconducting vortex lattice (VL) phase diagram in MgB2 as the applied magnetic field is rotated away from the c axis and towards the basal plane. The field rotation gradually suppresses the intermediate VL phase which exists between end states aligned with two high-symmetry directions in the hexagonal basal plane for H∥c. Above a critical angle, the intermediate state disappears, and the previously continuous transition becomes discontinuous. The evolution towards the discontinuous transition can be parametrized by a vanishing twelvefold anisotropy term in the VL free energy.

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  • Received 13 January 2021
  • Revised 12 March 2021
  • Accepted 16 March 2021

DOI:https://doi.org/10.1103/PhysRevB.103.094516

©2021 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Multiband superconductivityVortex lattices
  1. Physical Systems
Superconductors
  1. Techniques
Small angle neutron scattering
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. W. D. Leishman1, A. Sokolova2, M. Bleuel3,4, N. D. Zhigadlo5,*, and M. R. Eskildsen1,†

  • 1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 2Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization, New South Wales 2234, Australia
  • 3NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8562, USA
  • 4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA
  • 5Laboratory for Solid State Physics, ETH, CH-8093 Zurich, Switzerland

  • *Present address: CrystMat Company, CH-8037 Zurich, Switzerland.
  • †eskildsen@nd.edu

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Issue

Vol. 103, Iss. 9 — 1 March 2021

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