Journal
PHYSICAL REVIEW B
Volume 89, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.060404
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Funding
- US NSF [DMR-1157490]
- State of Florida
- DOE BES project Science at 100 Tesla
- DOE [DE-FG02-07ER46328]
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We study magnetic and multiferroic behavior in Ca3Co2-xMnxO6 (x similar to 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 Delta L/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 = 3/2 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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