Surface-step-terrace-induced anomalous transport properties in highly epitaxial La0.67Ca0.33MnO3 thin films.
La0.67Ca0.33MnO3 thin films were epitaxially grown on miscut MgO(001) substrates by pulsed laser ablation. Electrical transport properties were studied by using an ultra high vacuum, four-probe STM system at different temperatures. Anomalous resistivity behavior and metal-insulator transition temperatures were found, both of which are highly dependent upon the miscut angle (1, 3, and 5°). These phenomena are attributed to the difference in residual strain that results from the difference in terrace widths of the vicinal surfaces.
Lu
Hongliang
H
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China.
Zhang
Chendong
C
Guo
Haiming
H
Gao
Hongjun
H
Liu
Ming
M
Liu
Jian
J
Collins
Gregery
G
Chen
Chonglin
C
D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004579:Electron Transport; D007811:Lanthanum / Q000737:chemistry*; D008277:Magnesium Oxide / Q000138:chemical synthesis*; D008422:Materials Testing; D008567:Membranes, Artificial
D008567:Membranes, Artificial; D008277:Magnesium Oxide; C119467:lanthanum carbonate; D007811:Lanthanum