Magnetic anisotropy and magnetic phase diagram of Gd5Ge4
Magnetic anisotropy and magnetic phase diagram of Gd5Ge4
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DOI：
10.1103/physrevb.74.024401
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发表时间：
2006-07
影响因子：
3.7
通讯作者：
Ouyang W. Zhong;V. Pecharsky;K. Gschneidner;D. Schlagel;T. Lograsso
中科院分区：
文献类型：
--
作者：
Ouyang W. Zhong;V. Pecharsky;K. Gschneidner;D. Schlagel;T. Lograsso
单晶Gd 5Ge 4的磁化强度在零磁场下为128 K的反铁磁性，表明当磁场沿着c轴时发生了可逆的自旋翻转转变，而当磁场矢量垂直于c轴时没有类似的转变。这种各向异性行为是由于正交晶体的c轴和a或B轴之间的磁化能量的变化，该变化由Gd矩相对于磁场矢量的不同对准引起。反铁磁态的各向异性随着磁场和温度的增加而减小。当磁场矢量平行于B轴时，反铁磁-铁磁转变的临界磁场最小，铁磁态最稳定，表明沿该轴沿着易磁化方向.在Gd 5Ge 4的磁场诱导的转变的各向异性进行了讨论与耦合的磁性和结构的转变。构造了沿三个主要晶轴的各向异性磁相图沿着。
The magnetization of single crystal Gd5Ge4, which in a zero magnetic field orders antiferromagnetically at 128 K, indicates a reversible spin-flop transition when the magnetic field is along the c axis and the absence of similar transformations when the magnetic field vector is perpendicular to the c axis. This anisotropic behavior is due to variation of magnetization energy between the c axis and the a or b axes of the orthorhombic crystal caused by a different alignment of the Gd moments with respect to the magnetic field vector. The anisotropy of the antiferromagnetic state diminishes with the increasing magnetic field and temperature. The critical magnetic field for the antiferromagnetic-ferromagnetic transition is the smallest and the ferromagnetic state is most stable when the magnetic field vector is parallel to the b axis, indicating an easy magnetization direction along this axis. The anisotropy of the magnetic field-induced transformation in Gd5Ge4 is discussed in connection with the coupled magnetic and structural transitions. Anisotropic magnetic phase diagrams along the three major crystallographic axes are constructed.