Phase transitions and non-Fermi-liquid behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">UCu</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pd</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>at low temperatures
作者:R. Vollmer、T. Pietrus、H. v. Löhneysen、R. Chau、M. B. Maple
DOI:10.1103/physrevb.61.1218
日期:——
We report on measurements of the specific heat C and susceptibility chi on UCu5-xPdx (x = 0, 1, 1.25, 1.5, 2). For 1 less than or equal to 1 less than or equal to 1.5, the results suggest that non-Fermi-liquid behavior, i.e., a divergence of CIT and chi towards low temperatures, gives way to spin-glass freezing for n = 1 and x = 1.5, whereas no indication of a magnetically ordered ground state is observed for x = 1.25 down to 30 mK. A description based on the model of the Griffiths phase yields exponents lambda determined from C/T and chi, which are compatible with each other.