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

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	469-475
Number of pages	7
Journal	Solid State Communications
Volume	26
Issue number	8
DOIs	https://doi.org/10.1016/0038-1098(78)91291-7
State	Published - May 1978

Bibliographical 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.

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/0038-1098(78)91291-7

Cite this

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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.",

author = "DeLong, {L. E.} and Maple, {M. B.} and M. Tovar",

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.",

year = "1978",

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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.

PY - 1978/5

Y1 - 1978/5

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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