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High-T_c superconductors confined to two dimension exhibit novel physicalphenomena, such as superconductor-insulator transition. In theBi_2Sr_2CaCu_2O_8+x (Bi2212) model system, despite extensive studies, theintrinsic superconducting properties at the thinness limit have been difficultto determine. Here we report a method to fabricate high quality single-crystalBi2212 films down to half-unit-cell thickness in the form of graphene/Bi2212van der Waals heterostructure, in which sharp superconducting transitions areobserved. The heterostructure also exhibits a nonlinear current-voltagecharacteristic due to the Dirac nature of the graphene band structure. Moreinterestingly, although the critical temperature remains essentially the samewith reduced thickness of Bi2212, the slope of the normal state T-linearresistivity varies by a factor of 4-5, and the sheet resistance increases bythree orders of magnitude, indicating a surprising decoupling of the normalstate resistance and superconductivity. The developed technique is versatile,applicable to investigate other two-dimensional (2D) superconducting materials.

High-T_c superconductivity in ultrathin Bi_2Sr_2CaCu_2O_8+x down to halfunit-cell thickness by protection with graphene