EPR evidence for a weak first order behavior of the ferroelectric transition in (NH4)2SO4 |
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| Affiliation: | 1. Department of Physics and Astronomy, National Institute of Technology, Rourkela, India;2. Institute of Physics, Bhubaneswar, India;1. DTU Chemistry, Technical University of Denmark, Kemitorvet, 207, DK–2800 Kgs. Lyngby, Denmark;2. DTU Energy, Technical University of Denmark, Kemitorvet, 207, DK–2800 Kgs. Lyngby, Denmark;1. Scientific-Practical Materials Research Centre of NAS of Belarus, P.Brovka Str. 19, 220072 Minsk, Belarus;2. Physics Research Institute and Faculty of Physics, Southern Federal University, R.Zorghe Str. 5, 344090 Rostov-on-Don, Russia;3. I.M. Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia;4. Belarusian State University of Informatics and Radioelectronics, P.Brovka Str. 6, 220013 Minsk, Belarus;5. Department of Physics, Chungbuk National University, 410 Sungbong-ro, Gaesin-dong, 361-763 Cheongju, Chungbuk, South Korea;1. Institute of Inorganic Chemistry of the Czech Academy of Sciences, v.v.i, 250 68 Husinec-Řež 1001, Czech Republic;2. Charles University in Prague, Faculty of Science, Hlavova 2030/8, 128 43 Prague 2, Czech Republic;3. Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Praha 2, Czech Republic |
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| Abstract: | EPR line-broadening effects have been analyzed for the low (∼ 1010 Hz) rotational fluctuations of NH3 + radicals in (NH4)2SO4 crystals near their ferroelectric transition. Critical fluctuations together with coexistence of the paraelectric and ferroelectric phases have been observed and interpreted in terms of a weak first order, Landau-type model for the phase transition. |
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