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A series of measurements on both polycrystalline and single-crystal samples of NpCo(2) is reported in an effort to understand the low temperature magnetic properties. Previous studies claimed that NpCo(2) is an antiferromagnet below approximately 13 K. Magnetisation and Mössbauer experiments strongly suggest such a transition to an ordered state, although some aspects, such as the relaxation effects seen in Mössbauer spectra far below T(N), are unusual. A variety of neutron experiments, including small-angle scattering and searches along the principal crystallographic directions with a single crystal, have failed to reveal any direct evidence for long-range ordering of the Np moments. These measurements do not exclude short-range order or a spin-glass state, although the latter appears to be excluded by the magnetisation experiments. At this time a lack of understanding of the low temperature ground state of NpCo(2) exists. An account is given of the polarised-neutron experiments in an applied field that give direct evidence of hybridisation between Np 5f and Co 3d electrons.

Additional information

Authors: SANCHEZ J P ET AL., CEN Grenoble (FR);LEBECH B, Riso National Laboratory, Roskilde (DK);WULFF M ET AL., JRC Karlsruhe (DE);MATTENBERGER K ET AL., ETH Zürich (CH);BROWN P J, Institut Laue-Langevin, Grenoble (FR)
Bibliographic Reference: Article: Journal of Physics of Condensed Matter, Vol. 4 (1992), pp. 9423-9440
Record Number: 199310135 / Last updated on: 1994-11-29
Original language: en
Available languages: en