Multiferroicity with coexisting isotropic and anisotropic spins in Ca${}_3$Co${}_{2-x}$Mn${}_x$O${}_6$

Abstract

We study magnetic and multiferroic behavior in Ca${}_3$Co${}_{2-x}$Mn${}_x$O${}_6$ ($x\sim$0.97) by high-field measurements of magnetization ($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 Co${}^{2+}$ and Mn${}^{4+}$ 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 Mn${}^{4+}$ 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 Co${}^{2+}$ spins saturate by 25 T. Furthermore, our results imply that mechanism for suppression of electric polarization with magnetic fields near 10 T is flopping of the Mn${}^{4+}$ spins into the $ab$-plane, indicating that appropriate models must include the coexistence of Ising and quasi-isotropic spins.

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Cited by in corpus (7)

• Successive magnetic field-induced transitions and colossal magnetoelectric effect in Ni${}_3$TeO${}_6$
• Electric polarization observed in single crystals of multiferroic Lu2MnCoO6
• Colossal linear magnetoelectricity in polar magnet Fe2Mo3O8
• Ferroelectricity of structural origin in spin-chain compounds Ca${}_3$Co${}_{2-x}$Mn${}_x$O${}_6$
• Measurement of the angle dependence of magnetostriction in pulsed magnetic fields using a piezoelectric strain gauge
• Defect-induced spin textures in magnetic solids
• Rigorous determination of the ground-state phases and thermodynamics in an Ising-type multiferroic Ca3CoMnO6 chain