Field-effect experiments in NdBa[sub 2]Cu[sub 3]O[sub 7-δ] ultrathin films using a SrTiO[sub 3] single-crystal gate insulator

Matthey, D.; Gariglio, S.; Triscone, J.-M.
November 2003
Applied Physics Letters;11/3/2003, Vol. 83 Issue 18, p3758
Academic Journal
We report on the electrostatic modulation of superconductivity in very thin films of cuprate superconductors using a field-effect device based on a SrTiO[sub 3] single-crystal gate insulator. A T[sub c] modulation of 3.5 K and a 37% change of the normal state resistance have been observed in an epitaxial bilayer composed of an insulating PrBa[sub 2]Cu[sub 3]O[sub 7-δ] layer deposited on top of a superconducting NdBa[sub 2]Cu[sub 3]O[sub 7-δ] film, two unit cells thick. To achieve large electric fields, the thickness of the commercial dielectric single-crystal SrTiO[sub 3] substrate (also used as the gate insulator) was reduced to 110 μm. The dielectric properties of the gate insulator were characterized as a function of temperature and electric field and the magnitude of the field effect was quantified. A T[sub c] enhancement of 2.8 K was obtained for an applied field of -1.8×10[sup 6] V/m, corresponding to a polarization of -4 μC/cm[sup 2]. © 2003 American Institute of Physics.


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