Magnetoelectric effect in a spin-state transition system

Makoto Naka, Eriko Mizoguchi, Joji Nasu, Sumio Ishihara

Research output: Contribution to journalArticle

Abstract

Magnetic, dielectric, and magnetoelectric properties in a spin-state transition system are examined, motivated by the recent discovery of multiferroic behavior in a cobalt oxide. We construct an effective model Hamiltonian on the basis of the two-orbital Hubbard model, in which the spin-state degrees of freedom in magnetic ions couple with ferroelectric-type lattice distortions. A phase transition occurs from the high-temperature low-spin phase to the low-temperature high-spin ferroelectric phase with an accompanying increase in spin entropy. The calculated results are consistent with the experimental pressure-temperature phase diagram. We predict the magnetic-field induced electric polarization in the low-spin paraelectric phase near the ferroelectric phase boundary.

Original languageEnglish
Article number063709
JournalJournal of the Physical Society of Japan
Volume87
Issue number6
DOIs
Publication statusPublished - 2018 Jan 1

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cobalt oxides
dielectric properties
degrees of freedom
phase diagrams
entropy
magnetic properties
orbitals
polarization
magnetic fields
ions
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Magnetoelectric effect in a spin-state transition system. / Naka, Makoto; Mizoguchi, Eriko; Nasu, Joji; Ishihara, Sumio.

In: Journal of the Physical Society of Japan, Vol. 87, No. 6, 063709, 01.01.2018.

Research output: Contribution to journalArticle

Naka, Makoto ; Mizoguchi, Eriko ; Nasu, Joji ; Ishihara, Sumio. / Magnetoelectric effect in a spin-state transition system. In: Journal of the Physical Society of Japan. 2018 ; Vol. 87, No. 6.
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