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  Negative Thermal Expansion in the Plateau State of a Magnetically Frustrated Spinel

Rossi, L., Bobel, A., Wiedmann, S., Küchler, R., Motome, Y., Penc, K., et al. (2019). Negative Thermal Expansion in the Plateau State of a Magnetically Frustrated Spinel. Physical Review Letters, 123(2): 027205, pp. 1-6. doi:10.1103/PhysRevLett.123.027205.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-779F-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7996-B
Genre: Journal Article

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 Creators:
Rossi, L.1, Author
Bobel, A.1, Author
Wiedmann, S.1, Author
Küchler, R.2, Author              
Motome, Y.1, Author
Penc, K.1, Author
Shannon, N.1, Author
Ueda, H.1, Author
Bryant, B.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: We report on negative thermal expansion (NTE) in the high-field, half-magnetization plateau phase of the frustrated magnetic insulator CdCr2O4. Using dilatometry, we precisely map the phase diagram at fields of up to 30 T and identify a strong NTE associated with the collinear half-magnetization plateau for B > 27 T. The resulting phase diagram is compared with a microscopic theory for spin-lattice coupling, and the origin of the NTE is identified as a large negative change in magnetization with temperature, coming from a nearly localized band of spin excitations in the plateau phase. These results provide useful guidelines for the discovery of new NTE materials.

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Language(s): eng - English
 Dates: 2019-07-102019-07-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 123 (2) Sequence Number: 027205 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1