Universal curves in assessing the order of magnetic transition of La0.7−xPrxCa0.3MnO3 compounds exhibiting giant magnetocaloric effect

T. A. Ho, Sang Ho Lim, T. L. Phan, S. C. Yu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The magnetic properties of La0.7-xPrxCa0.3MnO3 (x = 0.0, 0.2, 0.3, 0.4, and 0.5) compounds fabricated by a solid-state reaction are studied by using Arrott plots and universal curves. The Arrott plots near the Curie temperature show negative slopes over the entire magnetic field range up to 50 kOe, indicating a first-order magnetic phase transition (according to Banerjee's criterion) for the x = 0.0, 0.2, 0.3, and 0.4 samples. For the x = 0.5 sample, however, the plots show positive slopes at low magnetic fields below 10 kOe, indicating a second-order transition. These results are further checked by universal curves of the normalized entropy change versus reduced temperature. The universal curves show a divergence among the curves with different magnetic fields for a first-order magnetic transition, but for a second-order transition, they collapse onto the same curve. The Curie temperature, around which the maximum magnetic entropy change occurs, decreases continuously from 260 to 110 K as x increases from 0.0 to 0.5. In the same x range, the maximum entropy change measured at a magnetic field span of 50 kOe decreases from 10.70 to 7.14 J/kg K, but the relative cooling power increases from 278 to 380 J/kg under the same magnetic field span.

Original languageEnglish
Pages (from-to)687-692
Number of pages6
JournalJournal of Alloys and Compounds
Volume692
DOIs
Publication statusPublished - 2017 Jan 25

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Magnetocaloric effects
Magnetic fields
Entropy
Curie temperature
Solid state reactions
Magnetic properties
Phase transitions
Cooling

Keywords

  • Magnetic phase transition
  • Magnetic properties
  • Magnetocaloric effect
  • Perovskite manganites

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Universal curves in assessing the order of magnetic transition of La0.7−xPrxCa0.3MnO3 compounds exhibiting giant magnetocaloric effect. / Ho, T. A.; Lim, Sang Ho; Phan, T. L.; Yu, S. C.

In: Journal of Alloys and Compounds, Vol. 692, 25.01.2017, p. 687-692.

Research output: Contribution to journalArticle

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AB - The magnetic properties of La0.7-xPrxCa0.3MnO3 (x = 0.0, 0.2, 0.3, 0.4, and 0.5) compounds fabricated by a solid-state reaction are studied by using Arrott plots and universal curves. The Arrott plots near the Curie temperature show negative slopes over the entire magnetic field range up to 50 kOe, indicating a first-order magnetic phase transition (according to Banerjee's criterion) for the x = 0.0, 0.2, 0.3, and 0.4 samples. For the x = 0.5 sample, however, the plots show positive slopes at low magnetic fields below 10 kOe, indicating a second-order transition. These results are further checked by universal curves of the normalized entropy change versus reduced temperature. The universal curves show a divergence among the curves with different magnetic fields for a first-order magnetic transition, but for a second-order transition, they collapse onto the same curve. The Curie temperature, around which the maximum magnetic entropy change occurs, decreases continuously from 260 to 110 K as x increases from 0.0 to 0.5. In the same x range, the maximum entropy change measured at a magnetic field span of 50 kOe decreases from 10.70 to 7.14 J/kg K, but the relative cooling power increases from 278 to 380 J/kg under the same magnetic field span.

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