The incommensurate - commensurate phase transition in Rb2ZnCl4: confrontation of permittivity and birefringence data |
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| Institution: | 1. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, PR China;2. Hubei Provincial Engineering Laboratory for Pond Aquaculture, Wuhan 430070, PR China;3. National Demonstration Center for Experimental Aquaculture Education, Huazhong Agricultural University, Wuhan 430070, PR China;1. ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, UK;2. Departamento de Mecánica, Universidad de Córdoba, 14071 Córdoba, Spain;3. ESS Bilbao, Poligono Ugaldeguren III, Pol. A, 7B - 48170 Zamudio, Bizkaia – País Vasco, Spain;4. London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK;1. Diffraction Group, Institut Laue-Langevin, 38054 Grenoble cedex 9, France;2. Theory Group, Institut Laue-Langevin, 38054 Grenoble cedex 9, France;1. State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;2. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;3. Shanghai Qizhi Institute, Shanghai 200232, China;4. Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China;5. Spallation Neutron Source Science Center, Dongguan 523803, China;6. Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan;7. Physik-Institut, Universität Zürich, Zürich CH-8057, Switzerland;8. ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot, Oxon OX11 0QX, UK;9. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin D-14109, Germany;10. Institut Laue-Langevin, Grenoble 9, Cedex 38042, France;11. Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Garching 85748, Germany;12. Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong, The University of Hong Kong, Hong Kong, China;13. Institute of Nanoelectronics and Quantum Computing, Fudan University, Shanghai 200433, China;14. Shanghai Research Center for Quantum Sciences, Shanghai 201315, China;15. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China |
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| Abstract: | Permittivity ϵ and birefringence Δn of the c-plates of Rb2ZnCl4 crystals have been measured simultaneously in the vicinity of the incommensurate (IC) - commensurate phase transition. Samples used are characterized by the maximum value ϵ = 150 occuring at a temperature Tm. Since ϵ in the IC phase is determined by the phase of the order parameter while Δn is sensitive to its modulus, confrontation of these data provides some insight into the transition process. The data show that i) the transition is essentially 1st order; ii) Tm marks the beginning of the transition process on cooling and its end on heating. Below Tm, both phases coexist within an interval ΔTtr = 1.5K on cooling and 0.6K on heating. iii) There is no indication of any significant phase coexistence above Tm. An indirect conclusion is drawn that within ΔTtr, the anomalous dielectric tail is due both to surviving solitons and to true domain wall contribution; below Tm−ΔTtr domain walls take over. |
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