Magnetic, structural, and electronic properties of the multiferroic compound FeTe2O5Br with geometrical frustration
- Authors
- Choi, K-Y; Choi, I. H.; Lemmens, P.; van Tol, J.; Berger, H.
- Issue Date
- Feb-2014
- Publisher
- IOP PUBLISHING LTD
- Keywords
- multiferroics; frustrated systems; electron spin resonance; Raman spectroscopy
- Citation
- JOURNAL OF PHYSICS-CONDENSED MATTER, v.26, no.8
- Journal Title
- JOURNAL OF PHYSICS-CONDENSED MATTER
- Volume
- 26
- Number
- 8
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/12471
- DOI
- 10.1088/0953-8984/26/8/086001
- ISSN
- 0953-8984
1361-648X
- Abstract
- We report electron spin resonance (ESR), Raman scattering, and interband absorption measurements of the multiferroic FeTe2O5Br with two successive magnetic transitions at T-N1 = 11.0 K and T-N2 = 10.5 K. ESR measurements show all characteristics of a low-dimensional frustrated magnet: (i) the appearance of an antiferromagnetic resonance (AFMR) mode at 40 K, a much higher temperature than T-N1, and (ii) a weaker temperature dependence of the AFMR linewidth than in classical magnets, Delta H-pp(T) proportional to T-n with n = 2.2-2.3. Raman spectra at ambient pressure show a large variation of phonon intensities with temperature while there are no appreciable changes in phonon numbers and frequencies. This demonstrates the significant role of the polarizable Te4+ lone pairs in inducing multiferroicity. Under pressure at P = 2.12-3.04 GPa Raman spectra undergo drastic changes and absorption spectra exhibit an abrupt drop of a band gap. This evidences a pressure-induced structural transition related to changes of the electronic states at high pressures.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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