EPR of dynamic Jahn-Teller distortion in CuII doped magnesium Tutton's salt |
| |
| Institution: | 1. PG & Research Department of Physics, Government Arts College, Ariyalur-621713, India;2. Department of Physics and Nanotechnology, SRM Institute of Science and Technology (formerly known as SRM University), Kattankulathur- 603203, India;1. The Faculty of Mathematics and Applied Physics, Rzeszów University of Technology, Powstańców Warszawy 8 Street, 35-959 Rzeszów, Poland;2. Materials Spectroscopy Laboratory, Institute of Physics, University of Rzeszów, Pigonia 1 Street, 35-310 Rzeszów, Poland;3. J. Heyrovský Institute of Physical Chemistry, Dolej?kova 2155/3, 182 23 Prague 8, Czech Republic;4. Synchrotron SOLEIL, Orme de Merisiers, St. Aubin, BP 48, F-91192 Gif sur Yvette Cedex, Franc.;5. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139 United States;6. Department of Physics and Astronomy, and LaserLaB, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, the Netherlands |
| |
| Abstract: | The dynamic Jahn-Teller distortion in single crystals of CuII doped magnesium Tutton's salt, MgK2(SO4)2·6H2O was studied by EPR spectroscopy. The directions of the g tensor axes were found to coincide with those of A at room temperature as well as at 113 K and were correlated with the MgO directions in the lattice. Two spatially distinct sites of copper were detected in the crystal. The g and A values were also calculated from the polycrystalline samples at various temperatures. A dx2-y2 ground state has been assigned for CuII, as in the isomorphous zinc Tutton's salt. The Silver and Getz model was applied to understand the dynamics of Jahn-Teller (JT) activity. The system was found to undergo dynamic JT distortion at all temperatures. At low temperatures, the Cu(H2O)6]2+ ion has three possible degenerate vibronic states corresponding to three possible directions for the long axis of the octahedron. The energy separations between the three inequivalent JT valleys were estimated as δ1,2 = 90 and δ1,3 = 370 cm?1. The lattice strain parameter V2 and the JT stabilization energy EJT were also estimated as 19,140 and 1030 cm?1 respectively. From the EJT value, the JT distortion present in the system was classified as a case of “strong” coupling. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
