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  First-order ferromagnetic transitions of lanthanide local moments in divalent compounds: An itinerant electron positive feedback mechanism and Fermi surface topological change

Mendive-Tapia, E., Paudyal, D., Petit, L., & Staunton, J. B. (2020). First-order ferromagnetic transitions of lanthanide local moments in divalent compounds: An itinerant electron positive feedback mechanism and Fermi surface topological change. Physical Review B, 101(17): 174437. doi:10.1103/PhysRevB.101.174437.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-B99B-B Version Permalink: http://hdl.handle.net/21.11116/0000-0006-B9A4-0
Genre: Journal Article


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Mendive-Tapia, Eduardo1, 2, Author              
Paudyal, Durga3, Author              
Petit, Leon4, Author              
Staunton, Julie B.5, Author              
1Department of Physics, University of Warwick, Coventry, CV4 7AL, U, ou_persistent22              
2Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863341              
3Ames Laboratory, U. S. Department of Energy, Iowa State University, IA 50011-1015, UK, ou_persistent22              
4Daresbury Laboratory, Warrington, WA4 4AD, UK, ou_persistent22              
5Department of Physics, University of Warwick, Coventry, CV4 7AL, UK, ou_persistent22              


Free keywords: Binary alloys; Europium alloys; Fermi surface; Ferromagnetic materials; Magnetocaloric effects; Rare earth elements; Topology, Discontinuous transition; Electronic mechanisms; Ferromagnetic orderings; Ferromagnetic transitions; First-order ferromagnetic transitions; Itinerant electrons; Magnetic phase transitions; Topological changes, Ferromagnetism
 Abstract: Around discontinuous (first-order) magnetic phase transitions, the strong caloric response of materials to the application of small fields is widely studied for the development of solid-state refrigeration. Typically strong magnetostructural coupling drives such transitions and the attendant substantial hysteresis dramatically reduces the cooling performance. In this context, we describe a purely electronic mechanism which pilots a first-order paramagnetic-ferromagnetic transition in divalent lanthanide compounds and which explains the giant nonhysteretic magnetocaloric effect recently discovered in a Eu2In compound. There is a positive feedback between the magnetism of itinerant valence electrons and the ferromagnetic ordering of local f-electron moments, which appears as a topological change to the Fermi surface. The origin of this electronic mechanism stems directly from Eu's divalency, which explains the absence of a similar discontinuous transition in Gd2In. © 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/" Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.


Language(s): eng - English
 Dates: 2020-05-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.101.174437
 Degree: -



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Project name : The present work forms part of the PRETAMAG project [47] , funded by the UK Engineering and Physical Sciences Research Council, Grant No. EP/M028941/1. E.M.-T. acknowledges funding from the DAAD short-term grant. The research work at Ames is supported by the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. The Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University of Science and Technology under Contract No. DE-AC02-07CH11358. This work made use of computational support by CoSeC, the Computational Science Centre for Research Communities, through CCP9.
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Funding program : -
Funding organization : Max Planck Society

Source 1

Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
Publ. Info: Woodbury, NY : American Physical Society
Pages: 7 Volume / Issue: 101 (17) Sequence Number: 174437 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008