Heavy-fermion like behavior of amorphous CexMn100−x alloys system studied by 55Mn NMR

In order to investigate a heavy-fermion like behavior on Ce-rich side of amorphous CexMn100−x alloys system, the 55Mn NMR measurements on the powdered sample of amorphous Ce62Y19Mn19, being diluted with non-magnetic Y, have been carried out in the temperature range from 1.8 to 270 K. A broadened resonance spectrum containing five NQR lines is observed in the measuring temperature region. Temperature dependences of Quadrupole coupling constant (e2Qq) and the line width of 55Mn NMR are obtained by means of analysis of each spectrum. Temperature dependence of the line width is expressed by the Curie-Weiss law with Tc = −12.0 K. The 1/(T1T) is rapidly increased in proportion to inverse square root of temperature with decreasing temperature, but it keeps almost constant below about 6 K, which shows the heavy-fermion state in Ce62Y19Mn19.