An electro-optical and electromechanical effect in SbSI

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Abstract

An electric field of the order of 5000 V/cm applied along the c-axis of a single crystal of antimony-sulfo-iodide (SbSI) shifts the optical absorption edge from 6300 Å to shorter wavelengths by about 80 Å at room temperature. This shift is, at room temperature, to a first approximation proportional to the square of the field strength for low fields and decreases with decreasing temperature. At the same time, an elongation of the crystal along the c-axis of a few tenths of a per cent is observed for the same external field. Both the shift of the absorption edge and the elongation do not change sign when the field is reversed.

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