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

Rossi, L.; Bobel, A.; Wiedmann, S.; Küchler, R.; Motome, Y.; Penc, K.; Shannon, N.; Ueda, H.; Bryant, B.

doi:10.1103/PhysRevLett.123.027205

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

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Küchler, R.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0004-779F-4

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.