Open AccessFabrication and characterization of La0.7Sr0.3MnO3 sandwich structure separated by （La0.7Sr0.3MnO3）m（BiFeO3）n superlattice
Author(s) -
王君伟,
Zhang Zu Yong,
姜平,
唐为华
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.4199
Subject(s) - superlattice , materials science , electrical resistivity and conductivity , condensed matter physics , biasing , sputtering , sputter deposition , thin film , optoelectronics , voltage , nanotechnology , physics , electrical engineering , engineering , quantum mechanics
The La0.7Sr0.3MnO3 sandwich structure separated by La0.7Sr0.3MnO3mBiFeO3n superlattices is grown in situ on SrTiO3001 substrates by RF magnetron sputtering. The X-ray diffraction scans indicate that the films are obviously superlattice structures. The resistivity-temperature curves measured in the case of current perpendicular to the plane geometry show that the films undergo metal-insulator transition at 290 K, which is a little lower than the temperature of single La0.7Sr0.3MnO3 film. When the current is within 0.01—10 mA, the peak resistivity of the La0.7Sr0.3MnO3mBiFeO3n films decreases with the increasing current.The change rate which is higher than that of single La0.7Sr0.3MnO3 film increases with the increasing thickness of the period films. The current-voltage curves indicate that the conduction mechanism in superlattices is space-charge-limited con-duction and a big bias voltage which is a characteristic of Schottky junction is also found in the current-voltage curves at low temperatures.