Effect of high pressure on the crystal structure, magnetic, and vibrational properties of multiferroic RbFe(MoO4)2
Effect of high pressure on the crystal structure, magnetic, and vibrational properties of multiferroic RbFe(MoO4)2
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DOI：
10.1103/physrevb.87.014112
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发表时间：
2013-01-22
影响因子：
3.7
通讯作者：
Savenko, B. N.
中科院分区：
文献类型：
--
作者：
Kozlenko, D. P.;Kichanov, S. E.;Savenko, B. N.
用X射线和中子粉末衍射、磁化率测量和拉曼光谱等方法研究了RbFe(MoO4)2的结构、磁性和振动性质。在P值接近1 GPa时，观察到从初始的三方相P(3)在杆状M1相上逐渐转变为单斜晶系的C2/c相，再到中间相P(3)在杆状相上的转变。在被抑制的三角相中，具有传播矢量q=(1/3，1/3，q(Z))的三角反铁磁序仍然是无公度的，在T=2K的压力范围内，Q(Z)值从0.45增加到0.48，Neel温度的压力系数等于(1/T-N)dT(N)/dp=0.09 Gpa(-1)。没有发现单斜相中形成长程磁序的证据。得到了三方相和单斜相的振动模的压力依赖关系。
The structural, magnetic, and vibrational properties of RbFe(MoO4) 2 have been studied by means of x-ray and neutron powder diffraction, magnetic susceptibility measurements, and Raman spectroscopy at pressures up to 10 GPa. The gradual structural phase transition from the initial trigonal P (3) over bar m1 phase to the monoclinic C2/c phase via the intermediate P (3) over bar phase was observed at P similar to 1 GPa. The triangular antiferromagnetic order with a propagation vector q = (1/3, 1/3, q(z)) in the suppressed trigonal phase remains incommensurate, and the q(z) value increases from 0.45 to 0.48 in the pressure range 0- 2 GPa at T = 2 K. The pressure coefficient of the Neel temperature is equal to (1/T-N)dT(N)/dP = 0.09 GPa(-1). No evidence of the formation of the long-range magnetic order in the monoclinic phase was found. The pressure dependencies of the vibrational modes for the trigonal and monoclinic phases were obtained.