Pressure Induced Spin-Glass→Single-Impurity Transition in LaCe, Superconductivity in LaCe and YCe under Pressure

摘要: The results of high pressure electrical resistivity measurements on classical spin-glass systems such as AuFe, CuMn, and AuMn are briefly reviewed. It is shown how studies give information about the nature interactions leading to well known freezing phenomena at a temperature TO. LaCe, dilute Ce concentrations Kondo system, shows typical behavior in above 1K for 10–40% Ce. Upon application moderate pressures (10–20 kbar) this system undergoes an apparent spin-glass→hsingle-impurity transition predicted by Larsen Doniach. Whereas superconducting TC less than pure La or all pressures, Y .6Ce.4 TC=1.6K 50 kbar TC=2.7K 110 kbar, values which higher those either alone.