Abstract
The temperature evolution of the optical absorption edge of (NH 3 C 2 H 5 ) 2 CuCl 4 crystals has been investigated in the vicinity of their low temperature phase transitions. It was shown that the absorption edge in these materials possesses an exponential shape. In the temperature range below 65 K it follows the empirical Urbach rule. The obtained experimental data confirmed existence of the phase transitions in (NH 3 C 2 H 5 ) 2 CuCl 4 at 232 K and 10 K. The anomalous behaviour of the parameters characterizing the absorption edge around 65 K would be related to earlier unknown phase transition.
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