F. Givord

Intermediate valence state of cerium in CeNi

Abstract Lattice parameter analysis and studies of thermal expansion show that the orthorhombic CeNi compound is, like CeSn 3 , an intermediate valence compound in which the cerium valence state varies from 3.5 to 3.3 between 4 and 300 K. This compound behaves as an enhanced Pauli paramagnet in which the magnetic susceptibility along the c axis passes through a maximum at around 140 K. Magnetic susceptibility, resistivity and heat capacity measurements are characteristic of an almost magnetic Fermi liquid in which spin fluctuations are present. Unlike the other cerium intermediate valence compounds which are generally cubic, large anisotropic effects due to the local surroundings are observed in CeNi because of its orthorhombic symmetry. All these properties can be understood in the light of the band structure of this type of alloy in which a large hybridization occurs between the Ni 3d electrons and the Ce 5d electrons.

Magnetic properties of single crystals of Gd Co 2 , Ho Ni 2 , and Ho Co 2

Magnetic measurements which have been performed on single crystals of the Gd

4f magnetism in CeNi, PrNi and NdNi single crystals☆

{\mathrm{Co}}_{2}

Onset of ferromagnetism and spin fluctuations in rare earth (or actinide)-3d compounds☆

, Ho

Invar properties in the rare earth-3d transition metal alloys

{\mathrm{Ni}}_{2}

Anomalous magnetic behavior of cerium in Ce2Sn5 and Ce3Sn7, two superstructures of CeSn3

, and Ho

Determination of cobalt behavior in TmCo2 and HoCo2 by means of polarized neutron diffraction

{\mathrm{Co}}_{2}

Phonon softening in an intermediate valence compound CeNi

Laves phases lead to a quantitative analysis of the crystal-field effects on energy and magnetization anisotropies. The anisotropy due to cobalt is negligible. Crystal-field parameters have been determined from the magnetization variation in intense magnetic fields. The change of easy magnetization direction observed at 14 K on Ho

Coherence effects and 5d contribution to the magnetism of Ce in CeSn3

{\mathrm{Co}}_{2}

Magnetic structures and field induced transitions in Ce2Sn5 and Ce3Sn7

corresponds to a change, with temperature, of the level scheme of the