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Oh, Yoon Seok
Laboratory for Strong Correlation in Quantum Materials
Research Interests
  • Multiferroic
  • Ferroelectric
  • Quantum Magnetism

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Multiferroicity with coexisting isotropic and anisotropic spins in Ca3Co2-xMnxO6

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Title
Multiferroicity with coexisting isotropic and anisotropic spins in Ca3Co2-xMnxO6
Author
Kim, Jae WookKamiya, Y.Mun, Eun DeokJaime, M.Harrison, N.Thompson, J. D.Kiryukhin, V.Yi, H. T.Oh, Y. S.Cheong, S. -W.Batista, C. D.Zapf, V. S.
Keywords
COMMENSURATE PHASES; MAGNETIZATION; POLARIZATION; MODEL
Issue Date
2014-02
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.89, no.6, pp.060404 -
Abstract
We study magnetic and multiferroic behavior in Ca3Co2−xMnxO6 (x∼ 0.97) by high-field measurements of magnetization (M), magnetostriction [L(H)/L], electric polarization (P), and magnetocaloric effect. This study also gives insight into the zero- and low-magnetic-field magnetic structure and magnetoelectric coupling mechanisms. We measured M and ΔL/L up to pulsed magnetic fields of 92 T, and determined the saturation moment and field. On the controversial topic of the spin states of Co2+ and Mn4+ ions, we find evidence for S=32 spins for both ions with no magnetic-field-induced spin-state crossovers. Our data also indicate that Mn4+ spins are quasi-isotropic and develop components in the ab plane in applied magnetic fields of 10 T. These spins cant until saturation at 85 T, whereas the Ising Co2+ spins saturate by 25 T. Furthermore, our results imply that the mechanism for suppression of electric polarization with magnetic fields near 10 T is flopping of the Mn4+ spins into the ab plane, indicating that appropriate models must include the coexistence of Ising and quasi-isotropic spins.
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DOI
10.1103/PhysRevB.89.060404
ISSN
2469-9950
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PHY_Journal Papers
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