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      In-plane superfluid density and microwave conductivity of the organic superconductor \kappa-(BEDT-TTF)2Cu[N(CN)2]Br: evidence for d-wave pairing and resilient quasiparticles

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          Abstract

          We report the in-plane microwave surface impedance of a high quality single crystal of \kappa-(BEDT-TTF)2Cu[N(CN)2]Br. In the superconducting state, we find three independent signatures of d-wave pairing: i) a strong, linear temperature dependence of superfluid density; ii) deep in the superconducting state the quasiparticle scattering rate \Gamma ~ T^3; and iii) no BCS coherence peak is observed in the quasiparticle conductivity. Above T_c, the Kadowaki-Woods ratio and the temperature dependence of the in-plane conductivity show that the normal state is a Fermi liquid below ~ 23 K, yet resilient quasiparticles dominate the transport up to ~ 50 K.

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          Most cited references 39

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          Doping a Mott insulator: Physics of high-temperature superconductivity

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            Effect of strong scattering on the low-temperature penetration depth of ad-wave superconductor

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              Evidence for rapid suppression of quasiparticle scattering belowTcinYBa2Cu3O7−δ

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                Author and article information

                Journal
                23 October 2012
                2013-08-09
                Article
                10.1103/PhysRevB.88.064501
                1210.6405

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                Custom metadata
                7 pages, 3 figures
                cond-mat.supr-con cond-mat.str-el

                Condensed matter

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