What is it about?
Letter (Europhys. Lett., 52 (2000) 557) discusses the formation of defect density waves (DDW) in a modulated system and a multiwave state explained in terms of a superposition of several modulations along a single crystallographic direction. We show that the structural evidence of DDW and of memory effects has been known for some time in SC(NH2)2 (Bagautdinov B. Sh. and Shmyt’ko I. M., JETP Lett., 59 (1994) 182).
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Why is it important?
In a letter (JETP Lett., 59 (1994) 182) we have presented diffraction evidence for the formation of DDW and of a memory effect in incommensurately modulated structures for the first time using single-crystal thiourea (SC(NH2)2). It was shown that addi- tional satellites in the diffraction pattern form due to the superposition of coexisting waves and that the memory effect reflects an equality of the periods of the coexisting structural modula- tions near the temperature of thermal stabilization.
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A superposition of modulated waves causes appearence of the additional high-harmonic satellites.
Dr Bagautdin Bagautdinov
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This page is a summary of: Comment on “The defect density waves in Zn
0.98
Sn
0.02
TiO
4
single crystal with incommensurately ..., EPL (Europhysics Letters), January 2002, Institute of Physics Publishing,
DOI: 10.1209/epl/i2002-00553-2.
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