Study of heavy fermion and superconductivity on non-Bloch rare-earth alloy system

测量了溅射法制备的非晶态合金CEM(M=Mn，Y，Ru)的低温材料性能。结果表明，CeYMn和CeU的Ce4f电子发生了近藤效应，并首次在没有平移对称性的Ce高浓区形成了较重的准粒子带。此外，从微观角度看，CeMn上的^&lt；55&gt；Mn-核磁共振显示该合金中存在重巡游电子。结果表明，在Ce浓度较低的区域，CeMn由于自旋涨落产生了较大的热膨胀系数，而CeU由于Ce的中间价态而产生了超导电性。

We have measured low-temperature materials properties of amorphous alloys CeM (M=Mn, Y, Ru) made by spattering method. The results show that the Kondo effect takes place on Ce 4f electrons of CeYMn and CeRu and that a heavy quasi-particle band is even formed in the high Ce concentration region of the system without translation symmetry, for the first time. Furthermore, ^<55>Mn-NMR on CeMn exhibits existence of heavy itinerant electrons in this alloy from the microscopic viewpoint. In the low Ce concentration region, the results suggest that the huge thermal expansion coefficient appears in CeMn due to the Mn spin fluctuation and that the superconductivity occurs in CeRu due to the intermediate valence state of Ce.