2007/01/25 by Koji Kaneko, K. Kaneko, N. Metoki +14
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0701609
8 pages, 8 figure, to appear in Phys. Rev. B
arxiv created 2007/01/25 · openalex publication_date 2007/01/25 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
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 = (1 0 0) for the applied field direction both H∥[1 1 0] and [0 0 1]. For H∥[1 1 0] at 8 T, it should be noted that the induced antiferromagnetic moment of 0.16(10) μ\rm B/Pr orients parallel to the field within our experimental accuracy. This observation is strong evidence that the Oxy electric quadrupole to be the primary order parameter for H∥[1 1 0]. A mean-field calculation, based on Γ1 singlet and Γ4(2) excited triplet with the Oxy quadrupolar interaction, reproduces the induced moment direction and its field response. These facts indicate the predominance of Oxy-type antiferroquadrupolar interaction in PrOs4Sb12.