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Neutron scattering study on the field-induced $$O_{xy}$$-type antiferroquadrupolar ordering of the heavy-fermion superconductor PrOs$$_4$$Sb$$_{12}$$

Kaneko, Koji   ; Metoki, Naoto   ; Shiina, Ryosuke*; Matsuda, Tatsuma; Kogi, Masafumi*; Kuwahara, Keitaro*; Bernhoeft, N.*

Neutron scattering experiments have revealed a field-induced antiferroquadrupolar order parameter in the Pr-based heavy-fermion superconductor PrOs$$_4$$Sb$$_{12}$$. We observed the field-induced antiferromagnetic dipole moment with the propagation vector $$q$$ = (1 0 0) for the applied field direction both $$H parallel$$ [1 1 0] and [0 0 1]. For $$H parallel$$ [1 1 0] at 8 T, it should be noted that the induced antiferromagnetic moment of 0.16 $$mu_{rm B}$$/ Pr orients parallel to the field within our experimental accuracy. This observation is strong evidence that the $$O_{xy}$$ electric quadrupole to be the primary order parameter for $$H parallel$$ [1 1 0]. A mean-field calculation, based on $$Gamma_1$$ singlet and $${Gamma}_4^{(2)}$$ 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 PrOs$$_4$$Sb$$_{12}$$.



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Category:Materials Science, Multidisciplinary



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