Relaxation of transport properties in electron doped SrTiO3

Details Relaxation of transport properties in electron doped SrTiO3 Relaxation of transport properties in electron doped SrTiO3

2007-08-12

arxiv.org/abs/0708.1610v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1063/1.2795336

We electron-dope single crystal samples of SrTiO_3 by exposing them to Ar^+ irradiation and observe carrier mobility similar in its magnitude and temperature dependence to the carrier mobility in other electron-doped SrTiO3 systems. We find that some transport properties are time-dependent. In particular, the sheet resistance increases with time at a temperature-dependent rate, suggesting an activation barrier on the order of 1 eV. We attribute the relaxation effects to diffusion of oxygen vacancies - a process with energy barrier similar to the observed activation energy.

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