Direct observation of quantum superconducting fluctuations in an insulating groundstate

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dc.creatorArmitage, N. P.
dc.creatorCrane, R.
dc.creatorSambandamurthy, G.
dc.creatorJohansson, A.
dc.creatorShahar, D.
dc.creatorGruner, G.
dc.date2007-06-01
dc.date.accessioned2026-07-07T08:03:52Z
dc.date.available2026-07-07T08:03:52Z
dc.descriptionWe review our recent measurements of the complex AC conductivity of thin InO_x films studied as a function of magnetic field through the nominal 2D superconductor-insulator transition. These measurements - the first of their type to probe nonzero frequency - reveals a significant finite frequency superfluid stiffness well into the insulating regime. Unlike conventional fluctuation superconductivity in which thermal fluctuations give a superconducting response in regions of parameter space that don't exhibit long range order, these fluctuations are temperature independent as T --> 0 and are exhibited in samples where the resistance is large (greater than 10^6 Ohms/Square) and strongly diverging. We interpret this as the direct observation of quantum superconducting fluctuations around an insulating ground state. This system serves as a prototype for other insulating states of matter that derive from superconductors.
dc.descriptionSubmitted to the proceedings of SCES07
dc.identifierhttps://arxiv.org/abs/0706.0144
dc.identifierhttp://arxiv.org/abs/0706.0144
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/129742
dc.subjectSuperconductivity
dc.subjectDisordered Systems and Neural Networks
dc.titleDirect observation of quantum superconducting fluctuations in an insulating groundstate
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