Volume 78, Number 5, June 2007
Article Number 57004
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 21 May 2007
EPL, 78 (2007) 57004
DOI: 10.1209/0295-5075/78/57004

Averaging of the electron effective mass in multicomponent transparent conducting oxides

J. E. Medvedeva

Department of Physics, University of Missouri-Rolla - Rolla, MO 65409, USA

received 16 January 2007; accepted in final form 23 April 2007; published June 2007
published online 21 May 2007

We find that layered materials composed of various oxides of cations with s2 electronic configuration, ${\rm XY}_{2}$O4, ${\rm X}={\rm In}$ or Sc, ${\rm Y}={\rm Ga}$, Zn, Al, Cd and/or Mg, exhibit isotropic electron effective mass which can be obtained via averaging over those of the corresponding single-cation oxide constituents. This effect is due to a hybrid nature of the conduction band formed from the s-states of all cations and the oxygen p-states. Moreover, the observed insensitivity of the electron effective mass to the oxygen coordination and to the distortions in the cation-oxygen chains suggests that a similar behavior can be expected in the technologically important amorphous state. These findings significantly broaden the range of materials as efficient transparent conductor hosts.

71.20.-b - Electron density of states and band structure of crystalline solids.

© Europhysics Letters Association 2007