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Modulated magnetism in PrPtAl

Abdul-Jabbar, G; Sokolov, DA; O'Neill, CD; Stock, C; Wermeille, D; Demmel, F; Krüger, F; ... Huxley, AD; + view all (2015) Modulated magnetism in PrPtAl. Nature Physics , 11 (4) pp. 321-327. 10.1038/NPHYS3238. Green open access

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Abstract

The transition between paramagnetism and ferromagnetism is the paradigm for a continuous phase transition at finite temperature. When such a transition is tuned to zero temperature in clean materials, the growth of low-energy zero-point fluctuations potentially drives an array of phenomena, including the formation of novel states such as non-conventional superconductivity. Experimentally, the growth of the fluctuations, however, is curtailed and the transition becomes discontinuous as its temperature is reduced. This is understood to arise from non-analytic corrections to the free energy that always occur1. In a recent theory2, 3, changes of the excitation spectrum are self-consistently considered alongside the ground state. This analysis reveals that a transition to a new state may be an alternative outcome. As the excitation spectrum (the ‘disorder’) is pivotal to promoting the new ‘order’ this mechanism is referred to as ‘order by disorder’. Here, we report the discovery of modulated order in PrPtAl, consistent with complex spirals, at the boundary between paramagnetism and ferromagnetism, giving the first clear experimental realization of such a state.

Type: Article
Title: Modulated magnetism in PrPtAl
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/NPHYS3238
Publisher version: http://dx.doi.org/10.1038/NPHYS3238
Language: English
Additional information: Copyright © 2015 Macmillan Publishers Limited. All rights reserved.
Keywords: Electronic properties and materials, Ferromagnetism, Magnetic properties and materials, Phase transitions and critical phenomena
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1462748
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