Abstract
The tendency towards superconducting granularity with sample degradation is a common feature of oxide superconductors. We present magnetic, transport and calorimetic results in LiTi 2O 4 which show that the topological tendency to segregate the superconducting state into islands surrounded by thin insulating layers is related to the structure of the material rather than to a mechanism associated to high T c. We emphasize that insulating samples with small Meissner fraction can have a superconducting volume fraction close to unity.
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