Field switching of superconductor-insulator bistability in artificially tuned organics

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Description

Layered organic superconductors situated in the vicinity of a superconductor-insulator (SI) phase boundary show switching between the SI bistable states by application of magnetic field. First, we show that an electronic phase of $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ [BEDT-TTF denotes bis(ethylenedithio)tetrathiafulvalene] can be finely tuned so as to approach the SI boundary by combination of chemical modification of the BEDT-TTF molecules and regulation of cooling rate. Then, we demonstrate that the superconducting phase tuned in this way undergoes a field-induced first-order transition into the insulating phase.

Journal

  • Physical Review B

    Physical Review B 67 (1), 014510-, 2003-01-14

    American Physical Society (APS)

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