Magnetocaloric effect and critical properties in La0.85Li0.15MnO3

作者：Han, Li-an^*; Pang, Shao-fang; Zhu, Hua-ze; Zhang, Peng-li; Yang, Jing; Zhang, Tao

来源：Journal of Materials Science: Materials in Electronics , 2018, 29(23): 20156-20161.

DOI：10.1007/s10854-018-0148-0

• TEMPERATURE
• MAGNETORESISTANCE
• RESISTIVITY

The manganite La0.85Li0.15MnO3 (LLMO) was synthesized by standard ceramic preparation routes, its magnetocaloric effect and critical phenomenon have been studied by measurements of dc-magnetization. The sample is of single phase with a rhombohedral structure confirmed by the X-ray diffraction refinement. M-T data reveal that the LLMO shows a second-order magnetic transition with a T-C of 235K. Maximum values of magnetic entropy change (- S-M(max)= 5.32J K-1 Kg(-1)) and relative cooling power (RCP=320.3J kg(-1)) have been observed when the magnetic field change is up to 5T. The LLMO compound with excellent magnetocaloric effect is expected to have effective applications in sub-room temperature range. In addition, the critical behavior around its T-C is thoroughly analyzed using the field dependence of the magnetic entropy change. The determined values of critical exponents (=0.507, =1.045, and =2.982) are fairly close to the theoretical values of the mean field model (=0.5, =1.0, and =3.0), indicating the presence of long-range ferromagnetic ordering in this system. The validity of the obtained exponents is confirmed by the scaling theory.

• 出版日期2018-12
• 单位西安科技大学