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Structure and Magnetic Properties of Three-Dimensional Gadolinium-Based Hybrid Framework

100%

Almáši M., Zeleňáková A., Císařová I., Bednarčík J., Zeleňák V.

vol. 126

issue 1

308-309

In the present work we have focused on the preparation and magnetic study of coordination polymer formed by Gd(III) cations as nodes and formate (HCOO¯; FOR) anions as charge compensating linkers. The prepared complex with formula {[Gd(μ_{3}-FOR)_{3}]}_{n} was characterized by single-crystal X-ray diffraction, and high-energy powder X-ray diffraction. The structural study showed that complex is formed by 3D polymeric network with the shortest Gd-Gd, distances of 3.998 Å. The magnetic properties of the complex were studied by magnetic susceptibility χ_{M}(T) and magnetization M(H) measurements. The results show on the weak antiferromagnetic coupling at low temperatures represented by the Weiss constant θ=-0.468 K. The value of effective magnetic moment μ_{eff}=7.57μ_{B}, which was estimated from the experimental data is close to the theoretical value for systems with S=7/2. Correlation between crystal structure of complexes and magnetic properties is presented.

Magnetic Properties of a Novel CeCo_{0.715}Si_{2.285} Compound

100%

Moudřík J., Prokleška J., Pospíšil J., Sechovský V., Císařová I.

We report on the basic physical properties of a novel CeCo_{0.715}Si_{2.285} compound, mainly its rich magnetic phase diagram. The compound crystallizes in the I-4m2 space group structure with extremely elongated unit cell (a = 4.12 Å, c = 32.84 Å). In a zero magnetic field it orders antiferromagnetically at T_{N} = 10.5 K with another order-to-order transition at 9.5 K. Under application of a magnetic field along the c-axis it manifests numerous magnetic transitions in small fields (B < 500 mT), resembling the so-called "devil's staircase" systems. Above 1 T the magnetization is almost constant up to 14 T (maximum magnetic field applied within our study) but considerably reduced (0.3 μ_B/Ce) with respect to the free Ce^{3+} ion. After removing the applied field, however, the high field state remains unchanged to be removed in negative fields. The compound also exhibits strong hysteresis of magnetization with respect to varying temperature or magnetic field. For fields applied along the a-axis typical behavior for the hard axis in the material with uniaxial anisotropy is observed.

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2 Acta Physica Polonica A

1 2015

1 2014

2 Císařová I.

1 Almáši M.

1 Bednarčík J.

1 Moudřík J.

1 Pospíšil J.

1 Prokleška J.

1 Sechovský V.

1 Zeleňák V.

1 Zeleňáková A.

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Structure and Magnetic Properties of Three-Dimensional Gadolinium-Based Hybrid Framework

Magnetic Properties of a Novel CeCo_{0.715}Si_{2.285} Compound