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Using polarizing microscopy in reflected light mode, we were able to observe domain structure in the BiSrCaCuO single crystals (BSCCO) at room temperature. Formation of domains structure is a phenomenon ocurring in ferroic phase transitions. In this paper we present experimental results of optical studies of the domain structure observed in BSCCO single crystals. We observed (110) domains walls only. No phase transition was observed at high temperature when the crystal was heated up to 700 OC.

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