## Abstract

The magnetic Mn^{3+} ions in La_{0.7}Ca_{0.3}MnO_{3} are partially replaced by nonmagnetic Zn^{2+} ions to form La_{0.7}Ca_{0.3}Mn_{1−x}Zn_{x}O_{3} compounds (x=0.0, 0.06, 0.08, and 0.1), and their magnetic and magnetocaloric properties are investigated. The Curie temperature decreases drastically from 245 to 70 K as x increases from 0 to 0.1. An analysis using the Banerjee's criterion of the experimental results for magnetization as a function of temperature and magnetic field indicates that the first-to-second order magnetic phase transformation occurs at a threshold composition of x=0.06, which is further supported by the universal curves of the normalized entropy change versus reduced temperature. The maximum magnetic entropy change measured at a magnetic field span of 50 kOe, which occurs near the Curie temperature, decreases from 10.30 to 2.15 J/kg K with the increase of x from 0.0 to 0.1. However, the relative cooling power, an important parameter for practical applications, shows a maximum value of 404 J/kg at x=0.08, which is 1.5 times greater than that observed for the undoped sample.

Original language | English |
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Pages (from-to) | 18-24 |

Number of pages | 7 |

Journal | Journal of Magnetism and Magnetic Materials |

Volume | 426 |

DOIs | |

Publication status | Published - 2017 Mar 15 |

## Keywords

- Magnetic phase transformation
- Magnetic properties
- Magnetocaloric effect
- Perovskite manganites
- Spin glass

## ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

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