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Finding the Elusive Sliding Phase in the Superfluid-Normal Phase Transition Smeared by c-Axis Disorder

Pekker, David and Refael, Gil and Demler, Eugene (2010) Finding the Elusive Sliding Phase in the Superfluid-Normal Phase Transition Smeared by c-Axis Disorder. Physical Review Letters, 105 (8). Art. No. 085302. ISSN 0031-9007. doi:10.1103/PhysRevLett.105.085302.

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We consider a stack of weakly Josephson coupled superfluid layers with c-axis disorder in the form of random superfluid stiffnesses and vortex fugacities in each layer as well as random interlayer coupling strengths. In the absence of disorder this system has a 3D XY type superfluid-normal phase transition as a function of temperature. We develop a functional renormalization group to treat the effects of disorder, and demonstrate that the disorder results in the smearing of the superfluid-normal phase transition via the formation of a Griffiths phase. Remarkably, in the Griffiths phase, the emergent power-law distribution of the interlayer couplings gives rise to a sliding Griffiths superfluid, with a finite stiffness in the a-b direction along the layers, and a vanishing stiffness perpendicular to it.

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Additional Information:© 2010 The American Physical Society. Received 2 April 2010; published 20 August 2010. It is our pleasure to thank Michael Lawler, Subir Sachdev, and Bryan Clark for insightful discussions. D. P. and E. D. acknowledge support from DARPA, CUA, and NSF Grant No. DMR-07-05472. G.R. gratefully acknowledges support from the Packard Foundation, the Sloan Foundation, and the Cottrell Scholars program.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Packard FoundationUNSPECIFIED
Sloan FoundationUNSPECIFIED
Cottrell Scholars programUNSPECIFIED
Issue or Number:8
Classification Code:PACS: 67.85.Hj
Record Number:CaltechAUTHORS:20100907-134630540
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19804
Deposited By: Tony Diaz
Deposited On:08 Sep 2010 17:24
Last Modified:08 Nov 2021 23:55

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