A 'p-n' diode with hole and electron-doped lanthanum manganite

Abstract

The hole-doped manganite La0.7Ca0.3MnO3 and the electron-doped manganite La0.7Ce0.3MnO3 undergo an insulator to metal transition at around 250 K, above which both behave as a polaronic semiconductor. We have successfully fabricated an epitaxial trilayer (La0.7Ca0.3MnO3/SrTiO3/La0.7Ce0.3MnO3), where SrTiO3 is an insulator. At room temperature, i.e. in the semiconducting regime, it exhibits asymmetric current-voltage (I-V) characteristics akin to a p-n diode. The observed asymmetry in the I-V characteristics disappears at low temperatures where both the manganite layers are metallic. To the best of our knowledge, this is the first report of such a p-n diode, using the polaronic semiconducting regime of doped manganites.

PostScript text and 2 figures, to be published in Appl. Phys. Lett.

References in corpus (3)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Breakdown of the lattice polaron picture in La0.7Ca0.3MnO3 single crystals
• Metal-Insulator Transition and Ferromagnetism in the Electron Doped Layered Manganites La2.3-xYxCa0.7Mn2O7 (x=0,0.3,0.5)

Cited by in corpus (9)

• Direct observation of electron doping in La0.7Ce0.3MnO3 using x-ray absorption spectroscopy
• Observation of minority spin character of the new electron doped manganite La_0.7Ce_0.3MnO_3 from tunneling magnetoresistance
• Electron-Hole Liquids in Transition Metal Oxide Heterostructures
• Transport, magnetic, and structural properties of La${}_{0.7}$Ce${}_{0.3}$MnO${}_3$ thin films. Evidence for hole-doping
• Electronic structure and transport properties of La_0.7Ce_0.3MnO_3
• Electrical-transport characteristics of as-grown and oxygen-reduced La${}_{0.7}$Ce${}_{0.3}$MnO${}_3$ films: calculation of hopping energies, Mn valences, and carrier localization lengths
• Metal-insulator transition and electroresistance in lanthanum/calcium manganites La_<1-x>Ca_<x>MnO_<3> (x = 0-0.5) from voltage-current-temperature surfaces
• Epitaxial stabilization of ultra thin films of electron doped manganites
• Mn${}^{2+}$/Mn${}^{3+}$ state of La${}_{0.7}$Ce${}_{0.3}$MnO${}_3$ by oxygen reduction and photodoping