Usual graphite samples, independently whether they are from natural sources, Kish or highly oriented pyrolytic graphite, bulk or powder samples, have interfaces. These interfaces occur between twisted regions with Bernal or rhombohedral or between Bernal and rhombohedral stacking orders. I discuss old and new results - from single interfaces (bilayer graphene) to multigraphene and bulk or powder graphite samples - that speak for the existence of superconductivity with a broad distribution of critical temperatures. Especial emphasis will be given to new results, which indicate the existence of granular superconductivity even above room temperature.
P. Esquinazi, Papers in Physics 5, 050007 (2013)
P. Esquinazi et al., Quantum Stud.: Math. Found. 5, 41 (2018)
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