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Pressure-induced polymorphism and piezochromism in Mn2FeSbO6
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
CAEP, Natl Key Lab Shock Wave & Detonat Phys, Inst Fluid Phys, Mianyang 621900, Sichuan, Peoples R China;NYU, Dept Chem, New York, NY 10003 USA.
Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing 100049, Peoples R China.
Univ Hawaii Manoa, Partnership Extreme Crystallog, Honolulu, HI 96822 USA.
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2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 114, no 16, article id 162903Article in journal (Refereed) Published
Abstract [en]

In the last decade, major efforts have been devoted to searching for polar magnets due to their vast potential applications in spintronic devices. However, the polar magnets are rare because of conflicting electronic configuration requirements of ferromagnetism and electric polarization. Double-perovskite oxides with a polar structure containing transition metal elements represent excellent candidates for the polar magnet design. Herein, the crystal structure evolution of Mn2FeSbO6 (MFSO) was investigated at pressures reaching similar to 50 GPa by in situ synchrotron X-ray diffraction (XRD), Raman scattering, and ab initio calculation techniques. The XRD results reveal ilmenite-to perovskite-type phase transition at around 35 GPa. An additional intermediate phase, observed in the range of 31-36 GPa by Raman spectroscopy, but not the XRD technique, is proposed to represent the polar LiNbO3 phase. It is argued that this phase emerged due to the heating effect of the Raman-excitation laser. The LiNbO3-type MFSO compounds, displaying an intrinsic dipole ordering, represent a promising candidate for multiferroic materials. The detected phase transitions were found to be reversible although a significant hysteresis was noticeable between compression and decompression runs. Moreover, a pressure-induced piezochromism, signifying a bandgap change, was discovered by the direct visual observations and corroborated by ab initio calculations. The present study benefits an efficient high-pressure synthesis of polar magnetic double-perovskite oxides in the future.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2019. Vol. 114, no 16, article id 162903
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-383857DOI: 10.1063/1.5090649ISI: 000466264600024OAI: oai:DiVA.org:uu-383857DiVA, id: diva2:1317820
Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-05-24Bibliographically approved

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Liu, LeiMathieu, RolandIvanov, SergeyLazor, Peter

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