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Electron spin resonance studies at the phase transition in YbInCu4

Authors:	T S Altshuler M S Bresler M Schlott B Elschner E Gratz

Institution:	1. Physico-Technical Institute, Russian Academy of Sciences, Kazan, Russia 2. Ioffe Physico-Technical Institute, Russian Academy of Science, St. Petersburg, Russia 3. Institut für Festk?rperphysik, FG Experimentalphysik, Technische Hochschule Darmstadt, D-64289, Darmstadt, Germany 5. Institut für Experimentalphysik, Technische Universit?t Wien, Wien, Austria

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 T_ph≈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).

Keywords:	76 30 75 20 H
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