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Large enhancement of magnetocaloric effect by chemical ordering in manganites

Abstract

For conventional ferromagnetic systems, magnetocaloric effect (MCE) is dominated by the entropy changes upon magnetic phase transitions. For strongly correlated oxides such as manganites, in which competing magnetic orders coexist and respond to external field differently, the MCE is more complex due to the electronic phase separation (EPS) phenomena. Taking the well-known (La2Pr1)5/8Ca3/8MnO3 (LPCMO) manganite as a model system, we invesitaged how the length scale of the EPS phases affects the MCE. Specifically, the EPS length scale can be dramatically reduced by a spatial ordering of the Pr dopants in the LPCMO system. Experimental results indicate that the magnetic entropy change of the Pr-ordered LPCMO is considerably larger than that of the Pr-random LPCMO by a factor up to six at the onset temperature of ferromagnetic phase. A direct relation between the length scale of EPS and MCE has been established based on the experimental results.

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Publication details

The article was received on 23 Nov 2017, accepted on 02 Jan 2018 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC05369J
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Large enhancement of magnetocaloric effect by chemical ordering in manganites

    Y. Wang, Y. Zhu, H. Liu, H. Lin, T. Miao, Y. Yu, F. Han, W. Wang, J. Sun, L. Yin and J. Shen, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05369J

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