Field-Induced Superconductivity in a Spin-Ladder Cuprate

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Science  28 Sep 2001:
Vol. 293, Issue 5539, pp. 2430-2432
DOI: 10.1126/science.1064204

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We report on the modulation of the transport properties of thin films, grown by molecular beam epitaxy, of the spin-ladder compound [CaCu2O3]4, using the field effect in a gated structure. At high hole-doping levels, superconductivity is induced in the nominally insulating ladder material without the use of high-pressure or chemical substitution. The observation of superconductivity is in agreement with the theoretical prediction that holes doped into spin ladders could pair and possibly superconduct.

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