The dependence of the superconducting transition temperature Tc on Ce impurity concentration and the specific heat jump at Tc as a function of Tc are reported for the system (LaCe)Sn3. The experimental results are analyzed using a theory due to Kaiser concerning the effect on superconductivity of nonmagnetic localized resonant impurity states This analysis yields values for the intraatomic Coulomb repulsion parameter Ueff and the Ce local density of states at the Fermi level Nℓ (EF). The results of low temperature normal state heat capacity and magnetic susceptibility measurements which give independent estimates of Nℓ (EF) are also reported. A large pressure dependence of the Tc of (LaCe)Sn3 alloys was observed for pressures up to 20 kbar. This behavior is similar to that previously observed in several other superconducting matrix-Ce impurity systems in which the Ce solute 4f electron shell undergoes a continuous-pressure induced demagnetization.
|Number of pages||7|
|Journal||Solid State Communications|
|State||Published - May 1978|
Bibliographical noteFunding Information:
Research lupported by the U. S. Energy Research and Development Administration under Contract No. ERDA E(04-3)-34PA227. Present address: Department of Physics, University of Virginia, Charlottesville, Virginia 22901. Fellow of the Coneejo Nacional de Investigaciones Cientificas y Tecnicas de la Republica Argentina on leave from Centro Atomico Bariloche, Bariloche, Argentina.
ASJC Scopus subject areas
- Chemistry (all)
- Condensed Matter Physics
- Materials Chemistry