Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4861678
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Funding
- Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea [2013K000405]
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We have prepared La0.7Ca0.3Mn0.91Ni0.09O3 and then studied its critical behavior and magnetocaloric effect. Analyzing temperature and field dependences of magnetization around the ferromagnetic-paramagnetic transition reveals the sample undergoing the second-order magnetic phase transition with the critical parameters T-C approximate to 199.4K, beta = 0.171 +/- 0.006, and gamma = 0.976 +/- 0.012. A considerable difference of these critical exponents compared with those expected for the standard models is due to the sample exhibiting the crossover property (tricriticality); its exponent values are more close to those expected for the tricritical mean-field theory with beta = 0.25 and gamma = 1. Under the field 40 kOe, the maximum magnetic entropy change (-Delta S-max) around T-C is about 7.1 J center dot kg(-1)center dot K-1, corresponding to a refrigerant capacity RC approximate to 170 J/kg. Particularly, its magnetic-field dependence obeys a power law vertical bar Delta S-max vertical bar infinity H-n, where n = 0.55 is quite far from the value calculated from the relation n = 1 + (beta - 1)/(beta + gamma). (C) 2014 AIP Publishing LLC.
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