Abstract
Heterojunctions composed of La1-x Srx Co O3-δ (x=0.4 and 0.5) and 0.7 wt % Nb-doped SrTi O3 were fabricated and exhibited good rectifying properties. The asymmetric current-voltage relations for the x=0.4 and x=0.5 junctions display opposite shapes: the former has a forward shape, while the latter shows a backward one. The x=0.4 junction can be viewed as a Schottky diode. For the x=0.5 junction, the forward bias currents show much less temperature dependence than the reverse ones and the reverse voltage Vchar, at which the bias current is 10 μA, displays a distinct change at the ferromagnetic transition temperature of the cobalt oxide of the junction. These observations in the x=0.5 junction can be understood by a nearly degenerate model together with its temperature-dependent magnetism.
Original language | English (US) |
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Article number | 163114 |
Journal | Applied Physics Letters |
Volume | 91 |
Issue number | 16 |
DOIs | |
State | Published - 2007 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)