Current-voltage and X-ray measurements in Fe3O2BO3

We report a current-voltage(I-V) study on Fe3O2BO3 between 145 and 330K. In this temperature range the material is paramagnetic and present charge ord ering below 220 K. Up to 190 K the I-V isotherms present two jumps, each wh ich shift to lower voltages as temperature increases. At these jumps there is hysteresis. Within this range it is believed that the material presents a Wigner Glass Phase. Above 200 K, the I-V isotherms present a non-linear b ehaviour which is enhanced with temperature and is similar to that presente d by charge density waves in TaS3. X-ray measurements do not show any struc tural change between 90 and 340 K. (C) 2001 Elsevier Science BY. All rights reserved.