K3 surfaces with an order 60 automorphism and a characterization of supersingular K3 surfaces with Artin invariant 1

In characteristic $p=0$ or $p>5$, we show that a K3 surface with an order 60 automorphism is unique up to isomorphism. As a consequence, we characterize the supersingular K3 surface with Artin invariant 1 in characteristic $p=11$ (mod 12) by a cyclic symmetry of order 60.
Comment: 14 pages. arXiv admin note: text overlap with arXiv:1203.5616