Optical study of the free-carrier response of LaTiO3/SrTiO3 superlattices.
Phys Rev Lett
; 99(26): 266801, 2007 Dec 31.
Article
em En
| MEDLINE
| ID: mdl-18233598
ABSTRACT
We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO_{3}/SrTiO_{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 approximately 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 approximately 35 fs and mobility approximately 35 cm;{2} 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.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2007
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Article