Small electroresistance (SER) in bulk La2/3Sr1/3MnO3 below TC

The voltage drop across a bulk polycrystalline sample of La2/3Sr1/3MnO3 was measured at applied currents in the range +/- 100mA at temperatures from 15 to 295 K. Under these conditions, the sample is essentially metallic. The V-I curves are close to linear. The resistance generally decreases with temperature, although there is a small peak in resistance at similar to 200 K. The electroresistance (ER) is small, rarely exceeding 10% over this range of temperatures and currents. This small electroresistance (SER) observed in the bulk material is in contrast to the "giant" or "colossal" electroresistance (GER, CER) reported previously in thin films of La2/3Sr1/3MnO3 and indicates that the anisotropy in thin films plays a key role in determining the magnitude of the electroresistance. (c) 2008 Elsevier B.V. All rights reserved.