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EPR lineshape of Mn in BCCD single crystals in the incommensurate phase

✍ Scribed by R. Heidler; H. Metz; W. Windsch

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
363 KB
Volume
229
Category
Article
ISSN
0009-2614

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✦ Synopsis

For the interpretation of the EPR lineshape of incommensurate phases there exist many theoretical models. We suppose a simple physical model to interpret the lineshape of the Mn 2+ EPR spectrum of the first incommensurate phase of betaine calcium chloride dihydrate (BCCD) and discuss it in comparison with other models. Furthermore, we investigate the critical behavior of BCCD at the normal to incommensurate phase transition on the basis of our model. The influence of the Mn'+ impurities on the phase sequence of BCCD is investigated by dielectric measurements.

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## Abstract The dielectric measurements of the layered crystal were studied in temperature range of successive phase transitions. The measurements revealed that the phase transition occurred in 242 K is an incommensurate phase transition. When the sample is annealed at a stabilized temperature in t