Strain coupling and acoustic attenuation associated with glassy magnetic phase transitions in the disordered double perovskite La2FeMnO6

Yang, Dexin and Yang, Tao and Mukherjee, Paromita and Dutton, Sian E. and Huo, Dexuan and Carpenter, Michael A. (2019) Strain coupling and acoustic attenuation associated with glassy magnetic phase transitions in the disordered double perovskite La2FeMnO6. Physical Review B, 99 (9). ISSN 2469-9950 DOI https://doi.org/10.1103/PhysRevB.99.094314

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Abstract

Elastic and anelastic anomalies in a ceramic sample of La2FeMnO6 have been characterized by resonant ultrasound spectroscopy in order to understand the strength and form of magnetoelastic coupling that accompanies the glassy magnetic transitions of a double perovskite with no long-range order of the B-site cations. The first transition, to a cluster glass below ∼280K, does not appear to involve any significant coupling with strain. The second glassy transition, near 55 K, appears to conform to Vogel-Fulcher dynamics in which magnetic dissipation and acoustic loss peaks arise from freezing driven by interactions between ferromagnetic clusters, with an activation energy of ∼0.03eV and time constant τo∼10−9s. The magnetoelastic coupling mechanism appears to involve local spin states with strain relaxation enhanced by changes in local electronic structure. Mediation of the coupling via strain also ensures that local heterogeneity in the strain state, such as at ferroelastic twin walls, will contribute to the magnetic heterogeneity of these materials.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA75
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Physical Review B
Volume: 99
Identification Number: https://doi.org/10.1103/PhysRevB.99.094314
Depositing User: Sarah Humbert
Date Deposited: 11 Apr 2019 13:46
Last Modified: 11 Apr 2019 13:46
URI: http://eprints.esc.cam.ac.uk/id/eprint/4464

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