期刊
PHYSICA B-CONDENSED MATTER
卷 404, 期 14-15, 页码 1879-1882出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2008.07.023
关键词
Manganites; Phase transition; Critical exponents
资金
- Jiangsu Education Department
- National Science Foundation of China (NSFC) [10634030]
Structure, magnetization, and specific heat have been investigated for the Mo-doping La0.67Sr0.33Mn1-x MoxO3 (x = 0, 0.01, 0.02, 0.03, 0.04, 0.06) perovskite system. The ferromagnetic to paramagnetic transition temperature T, is found to decrease from 369 K for x = 0 to 361 K for x = 0.06 with increasing Mo doping. According to a second-order phase transition model, the critical behavior near T-c are investigated systematically based on the specific heat data, and the critical exponents are determined to be alpha = 0.04-0.06, beta = 0.35-0.41, gamma = 1.13-1.25. The values of the critical exponents are found to keep almost same magnitude for La0.67Sr0.33Mn1-xMoxO3, system. It is noticed that the value of the critical exponent beta locates between the mean-field value (beta = 0.5) and the three-dimensional (3D) Ising model value (beta = 0.325), which suggests the coexistence of the short-range and long-range ferromagnetic orders around the critical temperature. The fundamental factors to dominate the magnitude of the critical exponent values for the perovskite-type manganese oxide systems have been discussed as well. (C) 2008 Published by Elsevier B.V.
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