Neutron scattering study on the field-induced O-xy-type antiferroquadrupolar ordering of the heavy-fermion superconductor PrOs4Sb12

作者：Kaneko K^*; Metoki N; Shiina R; Matsuda T D; Kohgi M; Kuwahara K; Bernhoeft N

来源：Physical Review B, 2007, 75(9): 094408.

DOI：10.1103/PhysRevB.75.094408

Neutron scattering experiments have revealed a field-induced antiferroquadrupolar order parameter in the Pr-based heavy-fermion superconductor PrOs4Sb12. We observed the field-induced antiferromagnetic dipole moment with the propagation vector q=(100) for the applied field direction both H parallel to[110] and [001]. For H parallel to[110] at 8 T, it should be noted that the induced antiferromagnetic moment of 0.16(10) mu(B)/Pr orients parallel to the field within our experimental accuracy. This observation is strong evidence that the O-xy electric quadrupole is the primary order parameter for H parallel to[110]. A mean-field calculation, based on Gamma(1) singlet and Gamma((2))(4) excited triplet with the O-xy quadrupolar interaction, reproduces the induced moment direction and its field response. These facts indicate the predominance of O-xy-type antiferroquadrupolar interaction in PrOs4Sb12.

• 出版日期2007-3
• 单位中国地震局