Specific heat of EuxSr1−xO near the ferromagnetic phase transition
Author(s) -
B. Stroka,
J. Wosnitza,
Elke Scheer,
H. v. Löhneysen,
W. Park,
K. Fischer
Publication year - 1992
Publication title -
zeitschrift für physik b condensed matter
Language(s) - English
Resource type - Journals
eISSN - 1431-584X
pISSN - 0722-3277
DOI - 10.1007/bf01320827
Subject(s) - ferromagnetism , exponent , condensed matter physics , critical exponent , phase diagram , specific heat , phase transition , yield (engineering) , phase (matter) , materials science , thermodynamics , physics , quantum mechanics , philosophy , linguistics
High-resolution measurements of the specific heat,C, near the ferromagnetic phase transition of the diluted ferromagnetic system EuxSr1−xO are reported. Samples with four different concentrations (x=1,x=0.9,x=0.7 andx=0.5) have been studied and the expected phase diagram, i.e. the linear decrease ofT c with decreasingx, is confirmed. Our specific-heat data of the pure EuO samples yield a critical exponent α=−0.12±0.02 in contrast to literature results, but in agreement with the value expected theoretically for this three-dimensional Heisenberg system. The origin of the discrepancies is traced down to differences in data analysis.
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