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Magnetocaloric effect in GdCu intermetallic compound
Author(s) -
Oboz M.,
Talik E.,
Winiarski A.
Publication year - 2012
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201100485
Subject(s) - magnetic refrigeration , antiferromagnetism , intermetallic , condensed matter physics , magnetization , magnetic susceptibility , paramagnetism , materials science , crystallography , magnetic moment , chemistry , physics , magnetic field , metallurgy , alloy , quantum mechanics
A single crystal of GdCu of FeB‐type was grown by the Czochralski method from a levitating melt and characterized using X‐ray diffraction, dc ‐magnetization M(T) and ac ‐magnetic susceptibility (ac‐ χ ). From ac and dc magnetic susceptibility a transition to the antiferromagnetic state has been found below T N = 37 K. The paramagnetic Curie temperature θ p and the effective magnetic moment μ eff were estimated assuming the Curie‐Weiss law in the 100 to 300 K range and were found to be θ p = –37 K and μ eff = 8.5 μ B . The last value is enhanced relatively to the free ion value of 7.94 μ B for Gd 3+ . The calculated entropy changes Δ S m for the examined compound amount to −1.22 J/K·kg, –0.6 J/K·kg and –0.09 J/K·kg at 7, 5 and 2 T respectively. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)