Quadrupole Effect in the Filled Skutterudite Compound PrOs<sub>4</sub>As<sub>12</sub>
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説明
Ultrasonic investigation of a single crystal of the filled skutterudite antiferromagnetic compound PrOs 4 As 12 was performed. Curie-type softening appeared in C L 111 = C B +(4/3) C 44 and C T 111 =(2/3)( C 11 - C 12 )/2+(4/3) C 44 , is explained in terms of the quadrupole susceptibility modified by a crystalline electric field with a Γ 4 (2) -triplet ground state and a Γ 1 -singlet first excited state. The quadrupole susceptibility analysis finds that the intersite quadrupole interactions in this compound are negative, indicating an antiferro-quadrupolar type interaction. Additional ultrasonic features, appeared in an ordered phase under magnetic fields between 2 and 3 T for H ∥[111] and H ∥[110], suggest the existence of another intermediate phase boundary. Magnetic field–temperature ( H – T ) phase diagrams for H ∥[111] and H ∥[1 1 0], which exhibits strong magnetic anisotropy, were obtained.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 77 225-228, 2008-01-03
Physical Society of Japan
