In-plane superfluid density and microwave conductivity of the organic superconductor -(BEDT-TTF)2Cu[N(CN)2]Br: evidence for d-wave pairing and resilient quasiparticles
Abstract
We report the in-plane microwave surface impedance of a high quality single crystal of -(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 ~ T3; and iii) no BCS coherence peak is observed in the quasiparticle conductivity. Above Tc, 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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