Magnetoelectric Properties of (Ca$_{1-x}$Sr$_{x}$)$_2$CoSi$_2$O$_7$ Crystals

M. Akaki; J. Tozawa; M. Hitomi; D. Akahoshi; H. Kuwahara

doi:10.1088/1742-6596/200/1/012003

paper

Magnetoelectric Properties of (Ca $_{1 - x}$ Sr $_{x}$ ) $_{2}$ CoSi $_{2}$ O $_{7}$ Crystals

arXiv:0909.1159 · doi:10.1088/1742-6596/200/1/012003

Abstract

We have investigated the magnetoelectric properties of (Ca $_{1 - x}$ Sr $_{x}$ ) $_{2}$ CoSi $_{2}$ O $_{7}$ ( $0 \leq x \leq 1$ ) crystals with a quasi-two-dimensional structure. In Ca $_{2}$ CoSi $_{2}$ O $_{7}$ ( $x = 0$ ), a canted antiferromagnetic transition occurs at 5.6 K. The transition temperature $T_{N}$ is increasing with increasing Sr concentration, and the rises of the magnetization and dielectric constant become larger. Since the dielectric constant shows large change at $T_{N}$ and the magnetocapacitance effect is observed below $T_{N}$ , a coupling between the magnetism and dielectricity is strong in (Ca $_{1 - x}$ Sr $_{x}$ ) $_{2}$ CoSi $_{2}$ O $_{7}$ . The positive magnetocapacitance is reduced by Sr substitution, and is not observed in $x \geq 0.5$ . Namely, the compound of $x \geq 0.5$ does not show the magnetic-field-induced electric polarization. On the other hand, the negative magnetocapacitance is enhanced by Sr substitution.

arXiv comment4 pages, 2figures, proceeding of International Conference on Magnetism 2009

Magnetoelectric Properties of (Ca $_{1 - x}$ Sr $_{x}$ ) $_{2}$ CoSi $_{2}$ O $_{7}$ Crystals

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Magnetoelectric Properties of (Ca1−x​Srx​)2​CoSi2​O7​ Crystals

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Magnetoelectric Properties of (Ca $_{1 - x}$ Sr $_{x}$ ) $_{2}$ CoSi $_{2}$ O $_{7}$ Crystals