Superconducting and normal state properties of dilute alloys of LaSn3 containing Ce impurities

L. E. DeLong; M. B. Maple; M. Tovar

doi:10.1016/0038-1098(78)91291-7

Superconducting and normal state properties of dilute alloys of LaSn₃ containing Ce impurities

L. E. DeLong
, M. B. Maple
, M. Tovar

Physics And Astronomy

Producción científica: Article › revisión exhaustiva

16 Citas (Scopus)

Resumen

The dependence of the superconducting transition temperature T_c on Ce impurity concentration and the specific heat jump at T_c as a function of T_c 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 U_eff and the Ce local density of states at the Fermi level N_ℓ (E_F). The results of low temperature normal state heat capacity and magnetic susceptibility measurements which give independent estimates of N_ℓ (E_F) are also reported. A large pressure dependence of the T_c 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.

Idioma original	English
Páginas (desde-hasta)	469-475
Número de páginas	7
Publicación	Solid State Communications
Volumen	26
N.º	8
DOI	https://doi.org/10.1016/0038-1098(78)91291-7
Estado	Published - may 1978

Nota bibliográfica

Funding 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.

Financiación

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.

Financiadores
U. S. Energy Research and Development Administration

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

Acceder al documento

10.1016/0038-1098(78)91291-7

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title = "Superconducting and normal state properties of dilute alloys of LaSn3 containing Ce impurities",

abstract = "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.",

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note = "Funding 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.",

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AU - DeLong, L. E.

AU - Maple, M. B.

AU - Tovar, M.

N1 - Funding 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.

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N2 - 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.

AB - 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.

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