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Abstract : We report on a 170Yb Mössabauer spectroscopy investigation of the low temperature magnetic properties of the cubic heavy electron material YbAuCu4. In the antiferromagnetically ordered phase TN=1 K, we measure a 20 % reduction of the Yb+3 saturated spontaneous moment with respect to that of the crystal field Γ7 ground state and we evidence a sizeable anisotropy of the interionic magnetic interaction. We interpret these features in terms of 4f electron - conduction electron hybridisation, which accounts for the heavy electron properties. The energy scale kBT0 of hybridisation is estimated to be 0.3 K. The Mössbauer spectra in the ordered and paramagnetic phases show inhomogeneous line broadenings which are interpreted as arising from a distribution of local strains along the 〈111〉 crystal axes, of mean magneto-elastic energy 0.2 – 0.4 K.





Autor: P. Bonville B. Canaud J. Hammann J. Hodges P. Imbert G. Jéhanno A. Severing Z. Fisk

Fuente: https://hal.archives-ouvertes.fr/



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