Crossover critical behavior and magnetic entropy change of La0.7Ba0.1Ca0.1Sr0.1MnO3: A comparison between wet-mixing and sol-gel synthesis methods

Dicky Rezky Munazat, Budhy Kurniawan, Dhawud Sabilur Razaq, Kazumitsu Watanabe, Hidekazu Tanaka

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated the effect of synthesis method on critical behavior and magnetic entropy change of La0.7Ba0.1Ca0.1Sr0.1MnO3. The samples were prepared using the wet-mixing (WM) and sol-gel (SG) methods. The Curie temperature (TC) was approximately 316 and 330 K for the WM and SG samples, respectively. The estimated critical exponents (β, γ, and δ) were close to the mean-field theory for the WM samples, whereas the exponent values for the SG sample were close to the tricritical mean-field model. The difference in the estimated critical exponents obtained from the same sample is known as a crossover phenomenon. The maximum magnetic entropy change (−ΔSM) under an applied magnetic field at 5 T was estimated at 3.16 and 4.89 J.kg−1.K−1 for the WM and SG samples, respectively. The synthesis method strongly affected physical properties and universality class, which can be explained by changes in the structural parameter and by grain size reduction.

Original languageEnglish
Article number412227
JournalPhysica B: Condensed Matter
Volume592
DOIs
Publication statusPublished - 1 Sep 2020

Keywords

  • Critical behavior
  • Magnetic entropy change
  • Perovskite manganite
  • Phase transition
  • Sol-gel
  • Wet-mixing

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