Giant barocaloric effect enhanced by the frustration of the antiferromagnetic phase in Mn3GaN

Daichi Matsunami, Asaya Fujita, Koshi Takenaka, Mika Kano

研究成果: Article査読

208 被引用数 (Scopus)

抄録

First-order phase transitions are accompanied by a latent heat. Consequently, manipulating them by means of an external field causes a caloric effect. Although transitions from antiferromagnetic to paramagnetic states are not controlled by a magnetic field, a large barocaloric effect is expected when strong cross-correlations between the volume and magnetic order occur. Here we examine how geometric frustration in itinerant antiferromagnetic compounds can enhance the barocaloric effect. We study the thermodynamic behaviour of the frustrated antiferromagnet Mn3GaN, and report an entropy change of 22.3 J kg-1 K-1 that is concomitant with a hydrostatic pressure change of 139 MPa. Furthermore, the calculated value of the adiabatic temperature change reaches 5 K by depressurization of 93 MPa. The giant barocaloric effect in Mn3GaN is caused by a frustration-driven enhancement of the ratio of volume change against the pressure coefficient of the Néel temperature. This mechanism for enhancing the barocaloric effect can form the basis for a new class of materials for solid-state refrigerants.

本文言語English
ジャーナルNature Materials
DOI
出版ステータスAccepted/In press - 2014 10月 26
外部発表はい

ASJC Scopus subject areas

  • 機械工学
  • 材料力学
  • 凝縮系物理学
  • 材料科学(全般)
  • 化学 (全般)

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