Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 46, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/46/465211
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Funding
- National Key Basic Research [2007CB925002]
- National Science Foundation of China [10774146, 50672099]
- Director's Fund of the Hefei Institutes of Physical Science, Chinese Academy of Science
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The critical behavior of the double perovskite La2NiMnO6 was investigated by measurement of the magnetization around the Curie temperature T-C. The magnetic data were analyzed in the critical region using the Kouvel-Fisher method to yield the critical exponents of beta = 0.408 +/- 0.011 with T-C = 270.50 (from the temperature dependence of the spontaneous magnetization below T-C) and gamma = 1.295 +/- 0.015 with T-C = 271.10 (from the temperature dependence of the inverse initial susceptibility above TC). The critical magnetization isotherm M(T-C, H) gives delta = 4.139 +/- 0.090. The critical exponents obtained by this method obey the Widom scaling relation delta = 1 + gamma/beta, implying the critical exponents are reliable. The values of critical exponents are close to those predicted by the three-dimensional (3D) Heisenberg model with short-range interactions.
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