TF-μ+SR in overdoped Tl2Ba2CuO6+x: simplicity still elusive

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Brewer, J.H.^1 ; Stubbs, S.L.^1 ; Liang, R.^1 ; Bonn, D.A.^1 ; Hardy, W.N.^1 ; Macfarlane, W.A.^2 ; Peets, D.C.^3

Department of Physics and Astronomy, University of British Columbia, Vancouver

BC

V6T 1Z1, Canada^1

Department of Chemistry, University of British Columbia, Vancouver

BC

V6T 1Z1, Canada^2

Center for Correlated Electron Systems, Institute for Basic Science, Seoul National University, Seoul

151-747, Korea, Republic of^3

关键词: Degree of disorder;    Fermi liquid behavior;    High quality;    Inflection points;    Magnetic penetration depth;    Oriented crystals;    Superfluid density;    Vortex lattices;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012030/pdf
DOI  :  10.1088/1742-6596/551/1/012030

来源: IOP

【 摘 要 】

Encouraged by predictions of simple Fermi liquid behavior in the overdoped versions of high temperature superconductors (HTcSC) based on CuO2 planes, we have performed TF-μ+SR experiments on several high quality oriented crystal mosaics of Tl2Ba2CuO6+x ("Tl-2201") in the vortex-lattice state where the magnetic penetration depth λ can be extracted from the characteristic superconducting (SC) lineshape by χ2-minimization fitting in the time domain. The results show evidence for a surprising degree of disorder, causing some "smearing" of the characteristic lineshape features, but we were able to extract λ as a function of temperature, revealing a remarkably consistent T-dependence of the SC carrier density ns λ-2that suggests this "role-model cuprate" is anything but "simple". The extracted superfluid density for all dopings exhibits a clear inflection point with temperature, suggesting a vortex lattice transition. Such a transition would have important implications for other measurements.