Magnetic anisotropy of the antiferroquadrupole phase in Ce0.50La0.50B6.
Magnetic anisotropy of the antiferroquadrupole phase in Ce0.50La0.50B6.
复制标题
Ce0.50La0.50B6 中反铁四极相的磁各向异性。
DOI：
10.1103/physrevlett.93.156409
复制
发表时间：
2004
影响因子：
8.6
通讯作者：
G. Kido
中科院分区：
文献类型：
--
作者：
M. Akatsu;T. Goto;O. Suzuki;Y. Nemoto;S. Nakamura;S. Kunii;G. Kido
用超声测量方法研究了具有Gamma(8)基态的Ce0.50La0.50B6中反铁四极(AFQ)相II和反铁磁(AFM)相III的磁相图。美国国家材料科学研究院的混合磁体(GAMA)用于30T以下的高场测量，3He-4He稀释式制冷机用于20MK以下的低温实验。在[001]磁场作用下，从顺磁I相到AFQ相II的相界在H(I-II)约29T处闭合，而在沿[110]和[111]方向直到30T的磁场下，相界仍然是开放的，这与基于O(Xy)型AFq有序的理论计算是一致的。我们还发现，AFM第三阶段在从[001]转向[110]和[111]方向时显著减少。
Magnetic phase diagrams for antiferroquadrupole (AFQ) phase II and antiferromagnetic (AFM) phase III in Ce0.50La0.50B6 with a Gamma(8) ground state have been investigated by ultrasonic measurements. The hybrid magnet (Gama) in the National Institute for Materials Science was employed for high-field measurements up to 30 T and a 3He-4He dilution refrigerator was used for low-temperature experiments down to 20 mK. The phase boundary from paramagnetic phase I to AFQ phase II under [001] magnetic fields closes at H(I-II) approximately 29 T, while the boundary is still open under fields along the [110] and [111] directions even up to 30 T. This anisotropic character of phase II in fields is consistent with the theoretical calculation based on the O(xy)-type AFQ ordering. We also found that AFM phase III reduces considerably in fields turning from the [001] to [110] and [111] directions.