Publication Type |
Journal Article |
School or College |
College of Engineering |
Department |
Materials Science & Engineering |
Creator |
Tiwari, Ashutosh |
Other Author |
Rajeev, K. P. |
Title |
Metal-insulator transition in La0.7Sr0.3Mn1-xFexO3 |
Date |
1999 |
Description |
We report the effect of Fe doping at the Mn site in La0.7Sr0.3MnO3 oxides. We find that the doping of Fe does not cause any structural change, but the electrical transport in the system is strongly affected. The parent compound La0.7Sr0.3MnO3 shows a resistivity peak at T=Tp (365 K) and behaves as a ferromagnetic metal at low temperature. Double exchange (DE) interaction between Mn3+ and Mn4+ is understood to be the cause of ferromagnetism and metallicity of the material. As Fe is doped into the system a depletion in the number of hopping electrons occurs and consequently the DE interaction becomes weak, however, as long as x≤0.2 the system shows metallic behavior at low temperatures. For higher Fe doping the system becomes insulating throughout the whole temperature range. Electron tunneling conductance measurements show that the density of states of metallic samples exhibits a dip at EF. As the value of x increases the dip deepens and finally at x=0.25 a gap opens up at the Fermi level. |
Type |
Text |
Publisher |
American Institute of Physics (AIP) |
Journal Title |
Journal of Applied Physics |
Volume |
86 |
Issue |
9 |
First Page |
5175 |
Last Page |
5178 |
DOI |
10.1063/1.371496 |
citatation_issn |
218979 |
Subject |
Tunneling conductance; Perovskite manganates; Iron doping; Fe doping |
Subject LCSH |
Manganese oxides -- Electric properties; Magnetoresistance; Metal-insulator transitions |
Language |
eng |
Bibliographic Citation |
Tiwari, A., & Rajeev, K. P. (1999). Metal-insulator transition in La0.7Sr0.3Mn1-xFexO3. Journal of Applied Physics, 86(9), 5175-8. |
Rights Management |
(c)American Institute of Physics. The following article appeared in Tiwari, A., & Rajeev, K. P., Journal of Applied Physics, 86(9), 1999 and may be found at http://dx.doi.org/10.1063/1.371496 |
Format Medium |
application/pdf |
Format Extent |
64,135 bytes |
Identifier |
ir-main,12107 |
ARK |
ark:/87278/s61r781t |
Setname |
ir_uspace |
ID |
706297 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s61r781t |