Sera M, Ichikawa H, Yokoo T, Akimitsu J, Nishi M, Kakurai K, Kunii S
Department of Quantum Matter, ADSM, Hiroshima University, Japan.
Phys Rev Lett. 2001 Feb 19;86(8):1578-81. doi: 10.1103/PhysRevLett.86.1578.
The magnetic field induced antiferromagnetic moment M(AF) at low magnetic fields in the antiferroquadrupolar (AFQ) ordered phase of CeB6 was investigated by elastic neutron diffraction experiments for H parallel [110]. The peak intensity at the AF magnetic reciprocal point (1 / 2,1 / 2,1 / 2) corresponding to M(2)(AF) increases with decreasing temperature below the AFQ ordering temperature T(Q), and exhibits a broad maximum at T approximately 3 K and decreases with a further decrease of temperature. This unusual behavior of M(AF) at low fields is explained as a result of the competition between the AF-octupolar and AF-exchange interactions in the O(xy) type AFQ ordered state.
通过对H平行于[110]方向进行弹性中子衍射实验，研究了CeB6反铁四极（AFQ）有序相中低磁场下磁场诱导的反铁磁矩M(AF)。对应于M(2)(AF)的反铁磁倒易点(1 / 2,1 / 2,1 / 2)处的峰强度在低于AFQ有序温度T(Q)时随温度降低而增加，并在T约为3 K时呈现出一个宽峰，随后随温度进一步降低而减小。低场下M(AF)的这种异常行为被解释为O(xy)型AFQ有序态中反铁八极相互作用和反铁交换相互作用之间竞争的结果。
