TITLE

Electrostatic modulation of the electronic properties of Nb-doped SrTiO[sub 3] superconducting films

AUTHOR(S)
Takahashi, K. S.; Matthey, D.; Jaccard, D.; Triscone, J. -M.; Shibuya, K.; Ohnishi, T.; Lippmaa, M.
PUB. DATE
March 2004
SOURCE
Applied Physics Letters;3/8/2004, Vol. 84 Issue 10, p1722
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have performed ferroelectric field effect experiments using an epitaxial heterostructure composed of ferroelectric Pb(Zr[sub 0.2]Ti[sub 0.8])O[sub 3] and superconducting Nb-doped SrTiO[sub 3]. The films were prepared on (001) SrTiO[sub 3] substrates by off-axis radio-frequency magnetron sputtering and pulsed-laser deposition. By switching the polarization field of the 500-Å-thick Pb(Zr[sub 0.2]Ti[sub 0.8])O[sub 3] layer, a large change of about 30% in resistivity and a 20% shift of T[sub c] (ΔT[sub c]∼0.05 K) were induced in the 400-Å-thick epitaxial Nb-doped SrTiO[sub 3] layer. The relationship between T[sub c] and the electrostatically modulated average carrier concentration can be mapped onto the phase diagram of chemically doped SrTiO[sub 3]. © 2004 American Institute of Physics.
ACCESSION #
12405709

 

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