Thermodynamic properties of superconductors containing impurities in a crystal-field singlet ground state

Experimental results on superconducting and magnetic properties of La$sub 3$In and La$sub 3$Tl containing magnetic impurities are presented and discussed. From magnetic susceptibility and low-temperature specific heat we conclude that Pr$sup 3+$ substituted for La$sup 3+$ in these compounds is in a...

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Bibliographic Details
Published in:Physical review. B, Solid state Solid state, 1975-09, Vol.12 (5), p.1778-1789
Main Authors: Heiniger, F., Bucher, E., Maita, J. P., Longinotti, L. D.
Format: Article
Language:English
Subjects:
360104 -Materials-Metals & Alloys-Physical Properties
ANTIFERROMAGNETISM
INDIUM ALLOYS- THERMODYNAMIC PROPERTIES
LANTHANUM BASE ALLOYS- THERMODYNAMIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
N50230 -Metals, Ceramics, & Other Materials-Metals & Alloys-Properties, Structure & Phase Studies
N66200 -Physics (Low Temperature)-Superconductivity
PRASEODYMIUM ALLOYS- THERMODYNAMIC PROPERTIES
SPECIFIC HEAT
SUPERCONDUCTIVITY
THALLIUM ALLOYS- THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
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Summary:Experimental results on superconducting and magnetic properties of La$sub 3$In and La$sub 3$Tl containing magnetic impurities are presented and discussed. From magnetic susceptibility and low-temperature specific heat we conclude that Pr$sup 3+$ substituted for La$sup 3+$ in these compounds is in a crystal-field singlet ground state; this also explains the characteristic behavior of the superconducting transition temperature as a function of the Pr concentration. The upper critical field of (La$sub 1$/sub -//subx/Pr/subx/)$sub 3$In is limited by the mean exchange field due to the Pr ions which are polarized in the external magnetic field. At Pr concentrations higher than x=0.90 the system (La$sub 1$/sub -//subx/Pr/subx/)$sub 3$In shows a transition to a self- polarized antiferromagnetic state at low temperatures.
ISSN:0556-2805
DOI:10.1103/PhysRevB.12.1778