Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session X48: Superconductivity: Critical Current, Magnetic Field Effects, and Vortex Physics
8:00 AM–10:48 AM,
Friday, March 19, 2021
Sponsoring
Unit:
DCMP
Chair: Michael Sentef, Max Planck Inst Structure & Dynamics of Matter
Abstract: X48.00011 : Field-Angle Dependent Vortex Lattice Phase Diagram in MgB2*
10:00 AM–10:12 AM
Live
Presenter:
Allan Leishman
(University of Notre Dame)
Authors:
Allan Leishman
(University of Notre Dame)
Anna Sokolova
(Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization)
Markus Bleuel
(NIST Center for Neutron Research, National Institute of Standards and Technology)
Nikolai Zhigadlo
(CrystMat Company, Zurich)
Morten Eskildsen
(University of Notre Dame)
Such is the case for MgB2, where a twelve-fold anisotropy causes the VL to fracture into degenerate, counter-rotated domains in the so called L phase. These domains alter the VL kinetics, which inhibits structural phase transitions and leads to robust metastable states. To explore the coupling of this anisotropy with the VL, we have performed small-angle neutron scattering (SANS) as we rotate the applied field away from the c axis. This rotation suppresses the twelve-fold anisotropy and the L phase correspondingly shrinks, eventually disappearing entirely above a critical angle.
*This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Award No. DE-SC0005051.
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