title: Observation of modulated quadrupolar structures in PrPb3.
abstract: Neutron diffraction measurements have been performed on the cubic compound PrPb(3) in a [001] magnetic field to examine the quadrupolar ordering. Antiferromagnetic components with q = (1/2 +/- delta 1/2 0), (1/2 1/2 +/- delta 0) (delta approximately 1/8) are observed below the transition temperature T(Q) (0.4 K at H = 0) whose amplitudes vary linear with H and vanish at zero field, providing the first evidence for a modulated quadrupolar phase. For H < 1 T, a nonsquare modulated state persists even below 100 mK suggesting quadrupole moments associated with a Tau(3) doublet ground state to be partially quenched by hybridization with conduction electrons.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan. onimaru@issp.u-tokyo.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Onimaru
authors.forename: T
authors.initials: T
authors.lastname: Sakakibara
authors.forename: N
authors.initials: N
authors.lastname: Aso
authors.forename: H
authors.initials: H
authors.lastname: Yoshizawa
authors.forename: H S
authors.initials: HS
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Takeuchi