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Pair‐Breaking and Magnetic Ordering in the Pseudo‐Quaternary Intermetallic Series (Y, Gd)Ni 2 B 2 C
Author(s) -
El Massalami M.,
Budko S. L.,
Giordanengo B.,
Fontes M. B.,
Mondragon J. C.,
BaggioSaitovitch E. M.,
Sulpice A.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221890217
Subject(s) - antiferromagnetism , condensed matter physics , superconductivity , intermetallic , magnetization , saturation (graph theory) , magnetic field , magnetism , materials science , physics , metallurgy , quantum mechanics , mathematics , alloy , combinatorics
Alloying influences on the superconducting and magnetic properties of the (Gd x Y 1− x )Ni 2 B 2 C series are studied. For x < 0.25, T c is degraded linearly with x as expected from the theory of Abrikosov‐Gorkov. Magnetization and magnetoresistivity measurements for x = 0.22 show that the magnetic saturation is attained only for fields as high as 80 kOe implying that even for such a low Gd concentration, antiferromagnetic couplings are quite strong. On the other hand, the magnetic dilution in the Heisenberg antiferromagnet GdNi 2 B 2 C causes a linear depression of the magnetic ordering temperatures as expected from molecular field theory. The abrupt quench of superconductivity for x > 0.25 and the coexistence of superconductivity with long‐range antiferromagnetic order for 0.1 < x < 0.25 are discussed.