Heavy electron YBNi 2 B 2 C and giant exchange YbNiBC: 170 Yb Mössbauer spectroscopy and magnetization studies

P. Bonville (), J. Hodges, Z. Hossain, R. Nagarajan, S. Dhar, L. Gupta, E. Alleno and C. Godart

The European Physical Journal B: Condensed Matter and Complex Systems, 1999, vol. 11, issue 3, 377-383

Abstract: We report low temperature 170 Yb Mössbauer spectroscopy and magnetization measurements on two tetragonal non-superconducting quaternary borocarbides, YbNi 2 B 2 C and YbNiBC, and present L III edge X-ray absorption data in YbNiBC. Both compounds show evidence of 4f-conduction band hybridisation. In the heavy electron YbNi 2 B 2 C, measurements down to 0.023 K show that only a small hyperfine interaction is present and we estimate an upper limit of 0.05–0.1 μ B for any Yb moment. In YbNiBC, magnetic ordering is observed below 4.2 K, in agreement with previous specific heat measurements. The single ion easy magnetization axis lies along the c axis but the ordered Yb moments lie in the basal ( a, b) plane. Their (extrapolated) saturated value is unusually low (0.35 μ B ). The Yb-Yb exchange interaction is very large and highly anisotropic with the dominant component lying in the basal plane. We also report 166 Er Mössbauer and specific heat data in the ferromagnet ErNiBC. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Keywords: PACS. 74.70.Dd Ternary, quarternary and multinary compounds (including Chevrel phases, borocarbides etc.), 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena, 76.80.+y Mössbauer effect; other γ-ray spectroscopy, (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1007/s100510050948

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