Abstract
Low-temperature specific heat measurements on Y 1−xPr xBa 2Cu 3 O 7 as a function of temperature T for X=0.2, 0.45, 0.6 with 90mK<T< 30K are reported. The specific heat of this system consists of a nuclear Schottky anomaly, a Pr magnetic Kondo anomaly and the background contribution. The large linear term of specific heat has been found to be connected with Kondo scattering of the mobile hole carriers by Pr magnetic moments. The spin-1 character of the Kondo specific heat anomaly indicates that the Pr valence state is close to +3 in the Y 1−xPr xBa 2CuO 7 system. The Tc depression and metal-insulator transition are believed to be attributed to the localization due to the interaction of Pr 4f electrons with hole carriers in CuO 2 planes.
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