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Magnetic Specific Heat of (Cd_{1-x-y}Zn_{y}Mn_{x})_{3}As_{2}

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Bednarski H., Cisowski J., Schmitt D., Voiron J., Portal J., Lubczyński W.

Acta Physica Polonica A

1993

vol. 84

issue 4

705-708

The specific heat of (Cd_{1-x-y}Zn_{y}Mn_{x})_{3}As_{2} with low Mn concentration (x ≤ 0.067) and for two Zn contents (y = 0.14 and y = 0.34) has been measured in the temperature range of 1.5-30 K. The magnetic contribution to the total specific heat has been analysed within our generalized pair approximation model which takes into account the complicated tetragonal crystal structure of Cd_{1-x-y}Zn_{y}Mn_{x})_{3}As_{2}. Assuming that the total Mn-Mn interaction strength is a sum of superexchange and the Bloembergen-Rowland exchange, we have obtained a very good agreement between our approach and experiment by using the analytical formulae with only two adjustable parameters, i.e. the first nearest-neighbour exchange constants for both mechanisms which appear to be strongly dependent on Zn content.

Specific Heat and Magnetic Structure of GdT_{2}X_{2} Compounds (T = Cu, Ni, X = Sn, Sb)

100%

Kaczmarska K., Pierre J., Schmitt D., Lambert-Andron B., Belllisent R., Guzik A.

Acta Physica Polonica A

1997

vol. 92

issue 2

347-350

The magnetic specific heat of GdNi_{2}Sn_{2}, GdNi_{2}Sb_{2} and GdCu_{2}Sb_{2} shows a λ-type anomaly at T_{N} with a noticeable reduction of the discontinuity compared to that expected for a simple antiferromagnet. It can be associated with the existence of amplitude modulated magnetic structure just below T_{N}. Above T_{N} a weak magnetic contribution is observed, evidencing the short-range ordering. From neutron diffraction studies it can be also concluded that investigated compounds have not simple antiferromagnetic structures. For GdNi_{2}Sn_{2} the propagation vector Q=(0.3,1/2,1/2) was found with the magnetic moments along the [1,0,0] axis.

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2 Acta Physica Polonica A

1 1997

1 1993

2 Schmitt D.

1 Bednarski H.

1 Belllisent R.

1 Cisowski J.

1 Guzik A.

1 Kaczmarska K.

1 Lambert-Andron B.

1 Lubczyński W.

1 Pierre J.

1 Portal J.

1 Voiron J.

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Magnetic Specific Heat of (Cd_{1-x-y}Zn_{y}Mn_{x})_{3}As_{2}

Specific Heat and Magnetic Structure of GdT_{2}X_{2} Compounds (T = Cu, Ni, X = Sn, Sb)