Thermodynamics of CeNiSn at low temperatures and in weak magnetic fields

Details Thermodynamics of CeNiSn at low temperatures and in weak magnetic fields Thermodynamics of CeNiSn at low temperatures and in weak magnetic fields

1999-03-14

arxiv.org/abs/cond-mat/9903218v1

Phys. Rev. B, vol. 59, p. 15070

Physics

Condensed Matter

Strongly Correlated Electrons

32 pages, 12 Postscript Figures

Scientific paper

10.1103/PhysRevB.59.15070

Detailed experimental and theoretical studies of the low-temperature specific heat, magnetic susceptibility, thermal expansion and magnetostriction of the orthorhombic compound CeNiSn are presented. All anomalies observed in the thermodynamic and magnetic properties of CeNiSn are explained in a framework of a model of metallic Kondo lattice with well developed spin-liquid-type excitations. The pseudogap behavior of these excitations appears due to interplay between spin-fermions and soft crystal-field (CF) states. The thermodynamic relations for the spin liquid are derived. Together with the explanation of inelastic neutron scattering spectra given earlier within a same approach these studies of the low-temperature thermodynamics and magnetic response give a consistent description of the nature of anomalies in the low-temperature thermodynamics of perfect and imperfect CeNiSn crystals.

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