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

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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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1 Acta Physica Polonica A

1 1997

1 Belllisent R.

1 Guzik A.

1 Kaczmarska K.

1 Lambert-Andron B.

1 Pierre J.

1 Schmitt D.

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