Abstract
In the intermetallic compound YbInCu4 the Gd3+-ESR and the static susceptibility were measured in the temperature range 1.5K–300 K, i.e. both below and above the valence phase transition which occurs in this material at Tph≈50 K. The Gd3+ resonance is mainly determined by exchange interaction of Gd3+ ions with fluctuating Yb3+ ions via conduction electrons (RKKY coupling) both below and above this transition. Arguments are presented that at low temperature YbInCu4 is a dense Kondo system (mixed valent state).
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Altshuler, T.S., Bresler, M.S., Schlott, M. et al. Electron spin resonance studies at the phase transition in YbInCu4 . Z. Phys. B - Condensed Matter 99, 57–60 (1995). https://doi.org/10.1007/s002570050010
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DOI: https://doi.org/10.1007/s002570050010