期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 480, 期 -, 页码 22-32出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2019.02.053
关键词
Combustion method; Critical exponents; Electron-doped system; Magnetocaloric effect; XAFS; XANES
资金
- Department of Science and Technology (DST), New Delhi
- Indian National Science Academy (INSA), New Delhi [IFA-13-PH-61]
- UGC-DAE Consortium for Scientific Research (CSR), Indore center [CSR/Acctts/2018-19/522]
- UGC-DAE Consortium for Scientific Research (CSR), Mumbai center [UDCSR/MUM/CD/CRS-M-255/2018/833]
Near-room-temperature and enhanced magnetocaloric properties are investigated for the chemical combustion synthesized electron-doped manganite La1-xZrxMnO3 with x = 0.05, 0.10 and 0.15. The single-phase rhombohedral crystal structure is observed particularly for the La0.90Zr0.10MnO3 (Zr10) system. Importantly, all the samples exhibit the paramagnetic-to-ferromagnetic (PM-to-FM) transition close to the room-temperature with the second-order phase transition. The analysis of the magnetic data in the critical region with different theoretical models such as 3D-Heisenberg, 3D-Ising, Mean-field, and Tri-critical mean-field suggested that the Zr10 sample exhibits the typical 3D-Heisenberg ferromagnetic characteristics. This indicated that the enhanced magnetic and magnetocaloric properties are governed by short-range exchange forces. Furthermore, the obtained data is also fitted with the Kouvel-Fisher method to obtain the transition-temperature, critical exponent beta and it is found that the transition temperature and beta values are totally consistent to that of the 3D-Heisenberg model. Significantly, the change in entropy vertical bar Delta S-m vertical bar I at 5 T is calculated to be 4.04 J.kg(-l).K-1 at 304 K in case of Zr10 sample indicating that it can be one of the potential material for the future magnetic refrigeration technology working at near room-temperature.
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