Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices

Details Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices

2007-03-15

arxiv.org/abs/cond-mat/0703415v2

Phys. Rev. Lett. 99, 266801 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.266801

We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual layer-thickness, the SLs exhibited a Drude metallic response with sheet carrier density per interface ~3x10^14 cm^-2. This is probably due to the leakage of d-electrons at interfaces from the Mott insulator LaTiO3 to the band insulator SrTiO3. We observed a carrier relaxation time ~ 35 fs and mobility ~ 35 cm^2V^-1s^-1 at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO3.

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