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A single-layer planar carbon sheet with four- and eight-membered rings, known as T-graphene, could be an intrinsic elemental 2D superconductor with a superconducting transition temperature (Tc) of more than 20 K. This is the new finding from researchers at Nanjing University in China who say that single-layer T-graphene, which could be used to fabricate superconducting nanodevices in the future, might be peeled off from a precursor potassium T-graphene intercalation compound (C4K) and be synthesized under high pressure in the laboratory. The precursor itself could have record values of Tfor layered carbon-based superconductors.

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Category: Science