Tricritical point in hole-doped manganite La0.5Ca0.4Li0.1MnO3
1 Department of Physics and Electronic Engineering, Hefei Normal University - Hefei 230061, China
2 High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China Hefei 230031, China
Received: 5 June 2014
Accepted: 27 July 2014
The critical behavior of hole-doped perovskite manganite La0.5Ca0.4Li0.1MnO3 has been investigated based on the static magnetization measurement around the second-order paramagnetic-ferromagnetic (PM-FM) transition at 250.5 K. The critical exponents and have been obtained based on both the modified Arrott plot and the Kouvel-Fisher method. The critical isotherm analysis gives . The critical exponents fulfill the Widom scaling relation and obey the single scaling equation , implying the reliability of the obtained exponents. Its relative cooling power (RCP) is found to be scaled with the magnetic field by the law of . The critical-exponent values deduced here approach the theoretical prediction of the tricritical mean-field model, which suggests that the present composition should be close to a tricritical point in the phase diagram of hole-doped manganite La0.5Ca0.5−xLixMnO3.
PACS: 75.40.-s – Critical-point effects, specific heats, short-range order / 75.30.-m – Intrinsic properties of magnetically ordered materials / 75.47.Lx – Magnetic oxides
© EPLA, 2014