# Optical Study of the Free-Carrier Response of ${\mathrm{LaTiO}}_{3}/{\mathrm{SrTiO}}_{3}$ Superlattices

• Seo, S. S. A. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
• Choi, W. S. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
• Lee, H. N. Materials Science and Technology Division, Oak Ridge National Laboratory, USA
Show more…
26.12.2007
Published in:
• Physical Review Letters. - 2007, vol. 99, no. 26, p. 266801
English 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 ≈3×10¹⁴ 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 cm² V⁻¹ s⁻¹ at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO₃.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
• English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300429
##### Statistics

Document views: 26 File downloads:
• bernhard_osf.pdf: 5