Temperature dependence of Mn2+ EPR in Sn2P2S6 near the phase transition |
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| Authors: | I N Geifman I V Kozlova U M Vysochanski V Ya Kofman O A Mikailo |
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| Institution: | 1. Institute of Semiconductors of the Ukrainian Academy of Sciences, pr. Nauki 45, 252028, Kiev, USSR
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| Abstract: | The X-band EPR spectrum of Mn2+ in Sn2P2S6 was studied in the temperature rangeT=223–363 K. At room temperature the spin-Hamiltonian constants areg=2.00±0.01,B 2 0 =(163±3)·10?4 cm?1,B 2 2 =(159±3)·10?4 cm?1,A=?(75±1)·10?4 cm?1. The effect of the invariance in temperature of the resonance magnetic fields in the narrow temperature rangeT=337–340 K and the model of the paramagnetic centre are discussed. According to EPR data a phase transition occurs atT=337 K. This transition from the paraelectric phase to the ferroelectric one is accompanied by a dramatic change in value of the spin-Hamiltonian constantB 2 0 . |
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