Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices
- Seoul National University
- ORNL
- University of Fribourg
We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO{sub 3}/SrTiO{sub 3} 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 {approx}3x10{sup 14}cm{sup -2}. This is probably due to the leakage of d electrons at interfaces from the Mott insulator LaTiO{sub 3}to the band insulator SrTiO{sub 3}. We observed a carrier relaxation time {approx}35fs and mobility {approx}35cm2V-1s-1 at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO{sub 3}.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 930911
- Journal Information:
- Physical Review Letters, Vol. 99; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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