Giant discrete steps in metal-insulator transition in perovskite manganite wires.
Optical lithography is used to fabricate LPCMO wires starting from a single (La(5/8-0.3)Pr(0.3))Ca3/8MnO3 (LPCMO) film epitaxially grown on a LaAlO3(100) substrate. As the width of the wires is decreased, the resistivity of the LPCMO wires exhibits giant and ultrasharp steps upon varying temperature and magnetic field in the vicinity of the metal-insulator transition. The origin of the ultrasharp transitions is attributed to the effect of spatial confinement on the percolative transport in manganites.
Zhai
Hong-Ying
HY
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
Ma
J X
JX
Gillaspie
D T
DT
Zhang
X G
XG
Ward
T Z
TZ
Plummer
E W
EW
Shen
J
J