Element-resolved thermodynamics of magnetocaloric
Journal Article
·
· Physical Review Letters
- Univ. of Duisburg-Essen, Duisburg (Germany); IFW Dresden, Dresden (Germany)
- Univ. of Duisburg-Essen, Duisburg (Germany); Max Planck Institute of Microstructure Physics, Halle (Germany)
- Ruhr-Univ. Bochum, Bochum (Germany)
- Univ. of Duisburg-Essen, Duisburg (Germany)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- IFW Dresden, Dresden (Germany)
- TU Darmstadt, Darmstadt (Germany)
By combination of two independent approaches, nuclear resonant inelastic x-ray scattering and first-principles calculations in the framework of density functional theory, we demonstrate significant changes in the element-resolved vibrational density of states across the first-order transition from the ferromagnetic low temperature to the paramagnetic high temperature phase of LaFe13-xSix. These changes originate from the itinerant electron metamagnetism associated with Fe and lead to a pronounced magneto-elastic softening despite the large volume decrease at the transition. As a result, the increase in lattice entropy associated with the Fe subsystem is significant and contributes cooperatively with the magnetic and electronic entropy changes to the excellent magneto- and barocaloric properties.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Argonne National Laboratory - Advanced Photon Source; USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1362293
- Alternate ID(s):
- OSTI ID: 1180313
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 114; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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