Second-Order Phase Transition At The Phase Boundary Through The FeRh First-Order Metamagnetic Phase Transition

Jamie R. Massey, Rowan C. Temple, Trevor P. Almeida, Ray Lamb, Nicolas A. Peters, Richard P. Campion, Raymond Fan, Damien McGrouther, Stephen McVitie, Paul Steadman, Christopher H. Marrows

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Jan 16, 2020
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Received Date: 2nd January 20

The phase coexistence present through first-order phase transitions implies the presence of phase boundary walls, which can be of finite size. Better understanding of the phase boundary wall properties will provide an insight into the dynamics of first-order phase transitions. Here, by combining x-ray photon correlation spectroscopy investigations with magnetometry measurements of magnetic relaxation through the thermally activated first-order metamagnetic phase transition present in the B2-ordered FeRh alloy, we are able to isolate the dynamic behaviour of the phase boundary wall present in this system. These investigations reveal a change in the nature of the dynamic behaviour and critical scaling of the relaxation time centred around the point of maximum phase coexistence within the phase transition. All of this behaviour can be attributed to the introduction of exchange coupling across the phase boundary wall and raises questions about the role of latent heat in dynamic behaviour of this region.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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