This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.89.054427 in citations.
Please use the identifier: http://hdl.handle.net/2128/9128 in citations.
Fluctuating local moments, itinerant electrons, and the magnetocaloric effect: Compositional hypersensitivity of FeRh
Fluctuating local moments, itinerant electrons, and the magnetocaloric effect: Compositional hypersensitivity of FeRh
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 calcu...
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Personal Name(s): | Staunton, J. B. (Corresponding Author) |
---|---|
Banerjee, R. / dos Santos Dias, Manuel / Deak, A. / Szunyogh, L. | |
Contributing Institute: |
Quanten-Theorie der Materialien; PGI-1 Quanten-Theorie der Materialien; IAS-1 |
Published in: | Physical Review B Physical review / B, 89 89 (2014 2014) 5 5, S. 054427 054427 |
Imprint: |
College Park, Md.
APS
2014
|
DOI: |
10.1103/PhysRevB.89.054427 |
Document Type: |
Journal Article |
Research Program: |
Spin-based and quantum information |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/9128 in citations.
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. |