A field induced modulated state in the ferromagnet PrPtAl

Christopher D O'Neill, Gino Abdul-Jabbar, Didier Wermeille, Philippe Bourges, Frank Kruger, Andrew D Huxley

Research output: Contribution to journalArticlepeer-review

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 polarised 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 coeffcient 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.
Original languageEnglish
Article number197203
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Letters
Volume126
Early online date13 May 2021
DOIs
Publication statusPublished - 14 May 2021

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