EPR and optical spectroscopy of MnO42- doped proper ferroelastic K3Na(CrO4)2:: local transition and Jahn-Teller effect

被引：3
|
作者：
Maksimova, T. [1 ]
Vikhnin, V. [1 ]
Asatryan, H. [1 ]
Hermanowicz, K. [2 ]
Maczka, M. [2 ]
Hanuza, J. [2 ]
机构：
[1] RAS, AF Ioffe Physicotech Inst, Polytekhnicheskaya 26, St Petersburg 194021, Russia
[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland
来源：
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 4, NO 3 | 2007年 / 4卷 / 03期
关键词：
D O I：
10.1002/pssc.200673726
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report the study of the polarized optical absorption, the near-infrared luminescence and the luminescence excitation spectra of the proper ferroelastic K3Na(CrO4)(2) crystals doped with MnO42- ions. It is obtained from the luminescence and the d-d absorption spectra that the 3d(1) electronic ground (E-2) and excited (T-2(2)) states of MnO42- are split by the monoclinic crystal field of the host lattice at T < 230 K. The well-resolved vibronic progressions in the luminescence spectra are ascribed to a strong coupling with a MnO42- bending nu(2) = 335 cm(-1) mode. The spectral dependence of the linear polarization degree rho(omega) of the charge-tranfer absorption for E vertical bar vertical bar c and E vertical bar vertical bar b polarization reveals a clear periodic structure due to interaction of local electronic states with a nu(1) = 816 cm(-1) local mode. The first EPR spectrum of the Mn6+ paramagnetic center in the K3Na(CrO4)(2):MnO42- crystal is studied. The local transition due to a local configuration instability of vibronic origin at low temperature T <= 18 K is detected and identified. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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页码：843 / +
页数：2
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