Nanodomain induced anomalous magnetic and electronic transport properties of LaBaCo2O5.5+δhighly epitaxial thin films.
A giant magnetoresistance effect (∼46% at 20 K under 7 T) and anomalous magnetic properties were found in a highly epitaxial double perovskite LaBaCo2O5.5+δ(LBCO) thin film on (001) MgO. Aberration-corrected Electron Microscopy and related analytical techniques were employed to understand the nature of these unusual physical properties. The as-grown film is epitaxial with the c-axis of the LBCO structure lying in the film plane and with an interface relationship given by (100)LBCO|| (001)MgOand [001]LBCO|| [100]MgOor [010]MgO. Orderly oxygen vacancies were observed by line profile electron energy loss spectroscopy and by atomic resolution imaging. Especially, oxygen vacancy and nanodomain structures were found to have a crucial effect on the electronic transport and magnetic properties.
F
F
Ruiz-Zepeda
C
C
Ma
D
D
Bahena Uribe
J
J
Cantu-Valle
H
H
Wang
Xing
X
Xu
M J
MJ
Yacaman
C
C
Chen
B
B
Lorenz
A J
AJ
Jacobson
P C W
PC
Chu
A
A
Ponce