Triple-q(-->) octupolar ordering in NpO2.

Paixão, J A; Detlefs, C; Longfield, M J; Caciuffo, R; Santini, P; Bernhoeft, N; Rebizant, J; Lander, G H

Paixão, J A; Detlefs, C; Longfield, M J; Caciuffo, R; Santini, P; Bernhoeft, N; Rebizant, J; Lander, G H.

Afiliación

Paixão JA; Departamento de Física, Universidade de Coimbra, P-3004 516 Coimbra, Portugal.

Phys Rev Lett ; 89(18): 187202, 2002 Oct 28.

Article en En | MEDLINE | ID: mdl-12398632

RESUMEN

We report the results of resonant x-ray scattering experiments performed at the Np M(4,5) edges in NpO2. Below T(0)=25 K, the development of long-range order of Np electric quadrupoles is revealed by the growth of superlattice Bragg peaks. The polarization and azimuthal dependence of the intensity of the resonant peaks are well reproduced assuming anisotropic tensor susceptibility scattering from a triple-q(-->) longitudinal antiferroquadrupolar structure. Electric-quadrupole order in NpO2 could be driven by the ordering at T0 of magnetic octupoles of Gamma(5) symmetry, splitting the Np ground state quartet and leading to a singlet ground state with zero dipole-magnetic moment.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2002 Tipo del documento: Article País de afiliación: Portugal Pais de publicación: Estados Unidos

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