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Field-effect experiments in NdBa2Cu3O7−δ ultrathin films using a SrTiO3 single-crystal gate insulator

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Published in Applied Physics Letters. 2003, vol. 83, no. 18, p. 3758-3760
Abstract We report on the electrostatic modulation of superconductivity in very thin films of cuprate superconductors using a field-effect device based on a SrTiO3 single-crystal gate insulator. A T-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 PrBa2Cu3O7-delta layer deposited on top of a superconducting NdBa2Cu3O7-delta film, two unit cells thick. To achieve large electric fields, the thickness of the commercial dielectric single-crystal SrTiO3 substrate (also used as the gate insulator) was reduced to 110 mum. 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-c enhancement of 2.8 K was obtained for an applied field of -1.8x10(6) V/m, corresponding to a polarization of -4 muC/cm(2).
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Research group Groupe Triscone
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MATTHEY, Daniel, GARIGLIO, Stefano, TRISCONE, Jean-Marc. Field-effect experiments in NdBa2Cu3O7−δ ultrathin films using a SrTiO3 single-crystal gate insulator. In: Applied Physics Letters, 2003, vol. 83, n° 18, p. 3758-3760. doi: 10.1063/1.1624635 https://archive-ouverte.unige.ch/unige:114266

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Deposited on : 2019-02-13

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