Ｐｄ７Ｃｅ合金の高密度近藤効果に及ぼす不規則化の影響

概要

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The changes in electrical resistivity and valence of Ce for Pd7Ce alloy were measured as a function of quenching temperature in order to clarify the effect of order-disorder on the physical properties related with 4f electrons. The absolute value of resistivity increases with quenching temperatures, and the temperature coefficient is different between the specimens quenched from higher and lower temperatures than Tc. The anomalies in resistivity can be explained in terms of an effect of 4f electrons in Ce, or “concentrated Kondo effect”. The valence of Ce was measures by L3-XANES using synchrotron radiation. The Ce valence changes insignificantly with quenching temperature. The results for resistivity and Ce valence suggest that the spacial distribution of the valence is wide in the alloy with a low degree of order， and the wide distribution causes the remarkable increase in resistivity and the small change in the averaged valence of Ce.
九州大学大学院総合理工学研究科,Interdisciplinary Graduate School of Engineering Sciences, Kyushu Universityの論文
1991-09-01