Abstract
The crystal and magnetic structures of the strong magnetoelectric BiMn2O5 have been studied as a function of pressure up to 5.7 GPa in the temperature range from 10 K to 60 K by means of neutron powder diffraction. The results reveal that the Pbam orthorhombic crystal structure remains unchanged in the investigated thermodynamic range. At ambient pressure, a long-range commensurate antiferromagnetic (AFM) phase with propagation vector q = (1/2, 0, 1/2) formed below T N = 41(2) K, accompanied by anomalies in the temperature dependence of structural parameters including the lattice parameters, interatomic distances, and bond angles. This AFM phase remained stable␣in the studied pressure range, and the relevant pressure coefficient of the Néel temperature was determined to be 3.0(4) K/GPa. No incommensurate AFM phase was detected. The magnetic properties of BiMn2O5 and their difference from most other RMn2O5 compounds were analyzed in terms of competing exchange interactions.
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Acknowledgements
This work has been supported by the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant No. 103.02-2014.11 and the Russian Foundation for Basic Research (RFBR) Grant No. 15-02-03248-a.
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Dang, N.T., Kozlenko, D.P., Kichanov, S.E. et al. Revealing the Formation Mechanism and Effect of Pressure on the Magnetic Order of Multiferroic BiMn2O5 Through Neutron Powder Diffraction. J. Electron. Mater. 46, 3373–3380 (2017). https://doi.org/10.1007/s11664-017-5351-x
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DOI: https://doi.org/10.1007/s11664-017-5351-x