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Structural and Magneto-transport Properties of Cr-doped In2O3 Diluted Magnetic Semiconductors

Published online by Cambridge University Press:  01 February 2011

N.B. Ukah ,
R K Gupta ,
K Ghosh ,
P K Kahol  and
R Giedd
N.B. Ukah
Affiliation:
[email protected], Missouri State University, Physics, Springfield, Missouri, United States
R K Gupta
Affiliation:
[email protected], Missouri State University, Physics, Springfield, Missouri, United States
K Ghosh
Affiliation:
[email protected], Missouri State University, Physics, Springfield, Missouri, United States
P K Kahol
Affiliation:
[email protected], Missouri State University, Physics, Springfield, Missouri, United States
R Giedd
Affiliation:
[email protected], Missouri State University, Physics, Springfield, Missouri, United States
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Abstract

We report the experimental study of the structural and magnetotransport properties of chromium-doped indium oxide (In2O3:Cr) thin films using x-ray diffractometer, and by measuring the resistivity and Hall effect as a function of temperature in various magnetic fields. The In2O3:Cr diluted magnetic semiconductor thin films were grown under different partial oxygen pressures (Po2) on sapphire substrates using pulsed laser deposition (PLD) technique. Observed expansions in lattice parameter and crystal size in these films with increase in oxygen growth pressure are traceable to the reduction in oxygen vacancies. A redshift of the absorption edges of the samples with increase in oxygen growth pressure is attributed to the significant improvement in crystallinity. The exchange interaction between the electron spins in the conduction band and the spins of the Cr 3d electrons was evident in the anomalous Hall effect (AHE), which persisted up to 300 K. An analysis of the dc electrical transport in the films was carried out using hopping conduction and ionized impurity scattering models.

Keywords

ablationelectrical propertiesHall effect
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1119: Symposium L – New Materials with High Spin Polarization and Their Applications , 2008 , 1119-L05-16
Copyright
Copyright © Materials Research Society 2009

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References

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