Transport properties of Mg2+ ion doped alpha-Cu(COOH)(2) single crystal

The temperature dependence of de electrical conductivity (sigma) and therma lly stimulated depolarization currents (TSDC) of a new low-dimensional MgxC u(COOH), single crystals have been studied in 77-300 K temperature range. T he electrical conductivity in this crystal is found to be mainly due to non adiabatic hopping mechanism, and the crystal undergoes a Peierls transitio n at about 208 K. The TSDC thermograph shows only one peak at 183 Ii in the pure (i.e. x = 0 mol%) crystal which is attributed to the detrapping of ho les, while three peaks in the Mg2+ ion doped (i.e, x = 1 and 2 mol%) crysta ls. These three peaks are assigned as one due to ion vacancy (I-V) dipole r edistribution, the second due to detrapping of charge carriers (holes), and the third is due to Maxwell-Wagner effect. (C) 1999 Elsevier Science S.A. All rights reserved.