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Fluctuating local moments, itinerant electrons, and the magnetocaloric effect : compositional hypersensitivity of FeRh

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Staunton, Julie B., Banerjee, Rudra, Dias, Manuel dos Santos, Deak, András and Szunyogh, Laszlo (2014) Fluctuating local moments, itinerant electrons, and the magnetocaloric effect : compositional hypersensitivity of FeRh. Physical Review B (Condensed Matter and Materials Physics), 89 (5). pp. 1-7. 054427. doi:10.1103/PhysRevB.89.054427

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Official URL: http://dx.doi.org/10.1103/PhysRevB.89.054427

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Abstract

We describe an ab initio disordered local moment theory for materials with quenched static compositional disorder traversing first-order magnetic phase transitions. It accounts quantitatively for metamagnetic changes and the magnetocaloric effect. For perfect stoichiometric B2-ordered FeRh, we calculate the transition temperature of the ferromagnetic-antiferromagnetic transition to be Tt= 495 K and a maximum isothermal entropy change in 2 T of |ΔS|=21.1 J K−1 kg−1. A large (40%) component of |ΔS| is electronic. The transition results from a fine balance of competing electronic effects which is disturbed by small compositional changes; e.g., swapping just 2% Fe of “defects” onto the Rh sublattice makes Tt drop by 290 K. This hypersensitivity explains the narrow compositional range of the transition and impurity doping effects.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Magnetic properties
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: 25 February 2014
Dates:
DateEvent
25 February 2014Published
Volume: 89
Number: 5
Number of Pages: 7
Page Range: pp. 1-7
Article Number: 054427
DOI: 10.1103/PhysRevB.89.054427
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), European Union (EU), European Social Fund (ESF)
Grant number: EP/J006750/1 (EPSRC),

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