Local structural investigation across the magnetic transition in the type-II multiferroic material FeVO4

Bera, G and Surampalli, A and Riddick, ML and Reddy, VR and Sathe, VG and Turpu, GR and Welter, E and Sagdeo, A and Meneghini, C (2024) Local structural investigation across the magnetic transition in the type-II multiferroic material FeVO4. In: Physical Review B, 109 (7).

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Abstract

The structural modifications associated with magnetic and multiferroic transitions in FeVO4 polycrystalline samples have been investigated using complementary techniques, including synchrotron radiation x-ray diffraction (XRD), Raman spectroscopy, and x-ray absorption fine-structure spectroscopy (XAFS). Temperature-dependent measurements reveal unveiled details of the local structural modifications intimately related to the spin-lattice coupling. This study is particularly focused on illuminating the changes occurring crossing the two distinct antiferromagnetic transition temperatures at 21.8 (±0.5) K (TN1) and 15.6 (±0.5) K (TN2) in the FeVO4. The combined analysis of XRD, Raman, and XAFS spectra rules out major modification of the Fe valence state or the average Fe-On coordination geometry related to the transitions at TN1 and TN2. On the contrary, structural modifications are revealed in the Fe-Fe, Fe-V, and Fe-O-V path distances as a function of temperature, attributable to changes in the tilting and rotation of Fe-On and/or V-On polyhedra, likely representing the microstructural fingerprint of changes in the super-super-exchange interactions along the Fe3+-O-V5+-O-Fe3+ pathway. © 2024 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society.
Keywords:	Binary alloys; Extended X ray absorption fine structure spectroscopy; Iron alloys; Synchrotron radiation; X ray absorption; X ray absorption near edge structure spectroscopy; X ray diffraction, Complementary techniques; Magnetic transitions; Multiferroic materials; Multiferroics; Polycrystalline samples; Structural investigation; Structural modifications; Synchrotron radiation x-ray diffractions; Type II; X-ray absorption fine-structure spectroscopies, Iron compounds
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Apr 2024 11:10
Last Modified:	09 Apr 2024 11:10
URI:	https://eprints.iisc.ac.in/id/eprint/84683

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