title: Signatures of new d-wave vortex physics in overdoped Tl2Ba2CuO(6+x) revealed by TF-µ(+)SR.
abstract: The spontaneous expulsion of applied magnetic field, the Meissner effect, is a defining feature of superconductors; in Type-II superconductors above the lower critical field, this screening takes the form of a lattice of magnetic flux vortices. Using implanted spin-1/2 positive muons, one can measure the vortex lattice field distribution through the spin precession and deduce key parameters of the superconducting ground state, and thereby fundamental properties of the superconducting pairing. Muon spin rotation/relaxation (µSR) experiments have indeed revealed much interesting physics in the underdoped cuprates, where superconductivity is closely related to, or coexistent with, disordered or fluctuating magnetic and charge excitations. Such complications should be absent in overdoped cuprates, which are believed to exhibit conventional Fermi liquid behaviour. These first transverse field (TF)-µ(+)SR experiments on heavily-overdoped single crystals reveal a superfluid density exhibiting a clear inflection point near 0.5Tc, with a striking doping-independent scaling. This reflects hitherto unrecognized physics intrinsic to d-wave vortices, evidently generic to the cuprates, and may offer fundamentally new insights into their still-mysterious superconductivity.
authors.affiliation: Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T 1Z1.
authors.forename: Jess H
authors.initials: JH
authors.lastname: Brewer
authors.affiliation: Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T 1Z1.
authors.forename: Scott L
authors.initials: SL
authors.lastname: Stubbs
authors.affiliation: Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T 1Z1.|Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8.
authors.forename: Ruixing
authors.initials: R
authors.lastname: Liang
authors.affiliation: Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T 1Z1.|Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8.
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.affiliation: Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T 1Z1.|Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8.
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy
authors.affiliation: Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8.|Department of Physics, Simon Fraser University, Burnaby, BC, Canada V5A 1S6.
authors.forename: J E
authors.initials: JE
authors.lastname: Sonier
authors.affiliation: Department of Chemistry, The University of British Columbia, Vancouver, BC, Canada V6T 1Z1.
authors.forename: W Andrew
authors.initials: WA
authors.lastname: MacFarlane
authors.affiliation: Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T 1Z1.|Center for Correlated Electron Systems, Institute for Basic Science, Seoul National University, Seoul 151-747, Korea.
authors.forename: Darren C
authors.initials: DC
authors.lastname: Peets
mesh_terms: D008962:Models, Theoretical