T. Altshuler et al., ESR STUDIES OF MAGNETIC STATE EVOLUTION AT THE PHASE-TRANSITION IN YB0.5IN0.5CU2, Physica. B, Condensed matter, 224(1-4), 1996, pp. 376-378
The ESR of the Gd+3 ion was investigated in Yb0.5In0.5Cu2 at temperatu
res below and above the first-order phase transition which occurs in t
his material at T-p similar to 50 K. We present arguments that this co
mpound is in a Kondo state that varies with the temperature and that t
he phase transition is connected with the change in the Yb+3 volume du
e to the ''Kondo-collapse'' mechanism.