Volume 55, Number 2, July 2001
|Page(s)||208 - 213|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2003|
Why stripes? Spontaneous formation of inhomogeneous structures due to elastic interactions
Laboratory of Solid State Physics,
Groningen University Nijenborgh 4,
9747 AG Groningen, The Netherlands
2 Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences Izhorskaya Str. 13/19, 127412 Moscow, Russia
Accepted: 26 April 2001
We argue that elastic interactions between ions in different valence states can play an essential role in the stabilization of stripes (or 2D "sheets" ) in doped oxides. These interactions are in general long range and an iso tro pic (attractive in certain directions and repulsive in others). This can naturally give rise to stripe-like structures in insulating materials. We illustrate this general idea with certain specific examples and show that the situation can be described by the Ising model with anisotropic interactions. The case of anisotropic impurities, relevant, e.g., for manganites, is also briefly discussed.
PACS: 64.75.+g – Solubility, segregation, and mixing; phase separation / 61.50.Ah – Theory of crystal structure, crystal symmetry; calculations and modeling / 71.28.+d – Narrow-band systems; intermediate-valence solids
© EDP Sciences, 2001
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