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Spin Frustration in Some Magnetic Compounds

100%

Szytuła A., Gondek Ł., Penc B., Hernandez-Velasco J.

Acta Physica Polonica A

2004

vol. 106

issue 5

583-591

In the paper the results of the powder neutron diffraction measurements of RAuIn (R = Ce, Tb, Dy, and Er) and ZnFe_2O_4 compounds at low temperatures are presented. For the RAuIn compounds, which crystallize in the hexagonal ZrNiAl-type structure, the rare-earth moments lie in the ab-plane and form a typical triangle non-collinear structure. ZnFe_2O_4 has the normal spinel structure in which the Fe^{3+} ions occupy the B sites, forming the corner-shared tetrahedra of the Fe spins. At low temperatures experimental data indicate the coexistence of the long-range and the short-range magnetic order. The obtained results suggest that the important factor which influences the magnetic ordering in these compounds is geometrical frustration of magnetic moments.

The Effect on Highly Cr-Substituted Manganite Nd_{0.6}C a_{0.4}(Mn_{0.5}Cr_{0.5})O_3

88%

Gamari-Seale H., Troyanchuk I., Bushinsky M., Stefanopoulos K., Hernandez-Velasco J.

Acta Physica Polonica A

2004

vol. 105

issue 1-2

81-86

Neutron powder-diffraction experiments on the highly Cr-substituted manganite, Nd_{0.6}Ca_{0.4}(Mn_{0.5}Cr_{0.5})O_3, at different temperatures and fields reveal that the structure retains the charge exchange-type of the parent compound, Nd_{0.6}Ca_{0.4}MnO_3. It is antiferromagnetic below 200 K and becomes a canted antiferromagnet below 50 K. The Mn and Cr form zig-zag ferromagnetic chains coupled antiferromagnetically in the ac-plane. These are stacked along the b-axis with opposite spins.

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2 Acta Physica Polonica A

2 2004

2 Hernandez-Velasco J.

1 Bushinsky M.

1 Gamari-Seale H.

1 Gondek Ł.

1 Penc B.

1 Stefanopoulos K.

1 Szytuła A.

1 Troyanchuk I.

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Spin Frustration in Some Magnetic Compounds

The Effect on Highly Cr-Substituted Manganite Nd_{0.6}C a_{0.4}(Mn_{0.5}Cr_{0.5})O_3