Physics – Condensed Matter – Superconductivity
Scientific paper
2006-04-04
Phys. Rev. B 75, 184530 (2007)
Physics
Condensed Matter
Superconductivity
7 pages, 4 figures
Scientific paper
10.1103/PhysRevB.75.184530
The complex ac conductivity of thin highly disordered InOx films was studied as a function of magnetic field through the nominal two-dimensional superconductor-insulator transition. We have resolved a significant finite-frequency superfluid stiffness well into the insulating regime, giving direct evidence for quantum superconducting fluctuations around an insulating ground state and a state of matter with localized Cooper pairs. A phase diagram is established that includes the superconducting state, a transition to a "Bose" insulator, and an eventual crossover to a "Fermi" insulating state at high fields. We speculate on the consequences of these observations, their impact on our understanding of the insulating state, and its relevance as a prototype for other insulating states of matter that derive from superconductors.
Armitage Peter N.
Crane R. W.
Gruner George
Johansson Anders
Sambandamurthy G.
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