Abstract
Hole-doped rare-earth manganite La0.7Ca0.3MnO3 and the electron-doped manganite La0.7Ce0.3MnO3 both show a metal-insulator transition around 250 K associated with a ferromagnetic transition and colossal magnetoresistance. In an earlier publication we have reported the rectifying characteristic of La0.7Ca0.3MnO3/SrTiO3/La0.7Ce0.3MnO3 tunnel junction at room temperature, showing that it is possible to fabricate a diode out of the polaronic insulator regime of doped manganites. Here we report the magneto-transport properties of such a tunnel junction above and below the metal-insulator transition. We show, from the large positive magnetoresistance of the tunnel junction at low temperature, that La0.7Ce0.3MnO3 could be a minority spin carrier ferromagnet. The implication of this observation is discussed.
Original language | English |
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Pages (from-to) | 1179-1182 |
Number of pages | 4 |
Journal | Pramana-Journal of Physics |
Volume | 58 |
Issue number | 5-6 |
DOIs | |
Publication status | Published - 1 May 2002 |
Keywords
- La0.7Ce0.3MnO3/SrTiO3/La0.7Ce0.3MnO3 tunnel junction
- magneto-transport properties
- magnetoresistance