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2 Acta Physica Polonica A

2 2000

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The Phase Diagram of the Second-Type Antiferromagnet

100%

Balcerzak T. , Radomska A.

Acta Physica Polonica A

2000

tom 97

nr 5

775-778

We investigate theoretically the phase diagrams of the second-type antiferromagnet with the fcc structure. Besides the nearest-neighbour and next-nearest-neighbour exchange interactions, the biquadratic and long-range dipolar terms are taken into account. The results can be useful to discuss the phase diagram of europium telluride under external pressure.

Calculations of EuTe Magnetic Phase Diagram for External Pressure

100%

Radomska A. , Balcerzak T.

Acta Physica Polonica A

2000

tom 98

nr 1-2

83-91

The magnetic phase diagram of europium telluride, EuTe, under external high pressure is theoretically investigated. Besides nearest-neighbour and next-nearest-neighbour exchange interactions, the long-range dipolar and biquadratic interactions are taken into account. The functional dependences of these interactions on the lattice constant are proposed. The calculated Néel and Curie temperatures are compared with the experimental data. Two new phases, antiferrimagnetic and ferrimagnetic, have been found at a high pressure and low temperatures.