Field-Induced Modulated State in the Ferromagnet PrPtAl

Christopher D. O’Neill, Gino Abdul-Jabbar, Didier Wermeille, Philippe Bourges, Frank Krüger, and Andrew D. Huxley
Phys. Rev. Lett. 126, 197203 – Published 13 May 2021
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Abstract

The theory of quantum order-by-disorder (QOBD) explains the formation of modulated magnetic states at the boundary between ferromagnetism and paramagnetism in zero field. PrPtAl has been argued to provide an archetype for this. Here, we report the phase diagram in magnetic field, applied along both the easy a axis and hard b axis. For field aligned to the b axis, we find that the magnetic transition temperatures are suppressed and at low temperature there is a single modulated fan state, separating an easy a axis ferromagnetic state from a field polarized state. This fan state is well explained with the QOBD theory in the presence of anisotropy and field. Experimental evidence supporting the QOBD explanation is provided by the large increase in the T2 coefficient of the resistivity and direct detection of enhanced magnetic fluctuations with inelastic neutron scattering, across the field range spanned by the fan state. This shows that the QOBD mechanism can explain field induced modulated states that persist to very low temperature.

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  • Received 2 September 2020
  • Accepted 13 April 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.197203

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Christopher D. O’Neill1,*, Gino Abdul-Jabbar1, Didier Wermeille2, Philippe Bourges3, Frank Krüger4,5, and Andrew D. Huxley1

  • 1School of Physics and CSEC, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
  • 2XMAS, ESRF, BP220, F-38043 Grenoble, France
  • 3Laboratoire Léon Brillouin (UMR12 CEA-CNRS), 91191 Gif-sur-Yvette Cedex, France
  • 4London Centre for Nanotechnology, University College London, Gordon Street, London WC1H 0AH, United Kingdom
  • 5ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom

  • *Corresponding author. chris.oneill@ed.ac.uk

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Issue

Vol. 126, Iss. 19 — 14 May 2021

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