Structural, magnetic and vibrational properties of multiferroic GaFeO3 at high pressure

JOURNAL OF ALLOYS AND COMPOUNDS

卷:684

Article

Golosova, N. O.¹  Kozlenko, D. P.¹  Kichanov, S. E.¹  Lukin, E. V.¹  Dubrovinsky, L. S.²  Mammadov, A. I.³  Mehdiyeva, R. Z.³  Jabarov, S. H.³  Liermann, H. -P.⁴  Glazyrin, K. V.⁴  Dang, T. N.⁵  Smotrakov, V. G.⁶  Eremkin, V. V.⁶  Savenko, B. N.¹ 

[1] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Russia

[2] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany

[3] ANAS, Inst Phys, Lab Nonstand Control & Diagnost, AZ-1143 Baku, Azerbaijan

[4] DESY, Photon Sci, D-22607 Hamburg, Germany

[5] Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam

[6] Southern Fed Univ, Phys Res Inst, Rostov Na Donu 344090, Russia

关键词: Multiferroic;    Crystal and magnetic structure;    X-ray diffraction;    Neutron diffraction;    High pressure;    Raman spectroscopy;   

DOI  :  10.1016/j.jallcom.2016.04.316

来源: Elsevier

【 摘 要 】

The crystal, magnetic structure and vibrational spectra of multiferroic GaFeO3 have been studied by means of neutron, X-ray powder diffraction and Raman spectroscopy at pressures up to 6.2 and 42 GPa, respectively. A presence of Fe/Ga antisite disorder leads to a formation of the ferrimagnetic ground state with the Neel temperature T-N = 292 K at ambient pressure. Upon compression, the magnetic ground state symmetry remains the same and the Neel temperature increases with a pressure coefficient (1/T-N)(dT(N)/dP) = 0.011(1) GPa(-1). Application of high pressure above 21 GPa leads to a gradual structural phase transition from the polar orthorhombic Pc2(1)n phase to nonpolar orthorhombic Pbnm phase. It is accompanied by anomalies in the pressure behaviour of several Raman modes. Pressure dependencies of lattice parameters and Raman modes frequencies in the observed structural phases were obtained. (C) 2016 Elsevier B.V. All rights reserved.

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