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Rossi L, Bobel A, Wiedmann S, Küchler R, Motome Y, Penc K, Shannon N, Ueda H, Bryant B. Negative Thermal Expansion in the Plateau State of a Magnetically Frustrated Spinel. PHYSICAL REVIEW LETTERS 2019; 123:027205. [PMID: 31386536 DOI: 10.1103/physrevlett.123.027205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/04/2019] [Indexed: 06/10/2023]
Abstract
We report on negative thermal expansion (NTE) in the high-field, half-magnetization plateau phase of the frustrated magnetic insulator CdCr_{2}O_{4}. 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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Affiliation(s)
- L Rossi
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, Netherlands
- Institute of Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands
| | - A Bobel
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, Netherlands
- Institute of Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands
| | - S Wiedmann
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, Netherlands
- Institute of Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands
| | - R Küchler
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - Y Motome
- Department of Applied Physics, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
| | - K Penc
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary
| | - N Shannon
- Okinawa Institute of Science and Technology Graduate University, Onna-son, Okinawa 904-0495, Japan
- Department of Physics, Technische Universität München, D-85748 Garching, Germany
| | - H Ueda
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - B Bryant
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, Netherlands
- Institute of Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands
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