Superconductivity and critical spin fluctuations
In a succesful recent experiment on IN5, we were able to show that in contrast to commonly accepted wisdom, the excitation gap in nearly optimally doped La(1.855)Sr(0.145)CuO(4) does not open at the superconducting transition temperature, Tc, but at a much lower temperature T0~Tc/2. Combining this result with published data from the literature suggests a highly intriguing trend - consist with quantum criticality near optimal doping in a simple cuprate superconductor - of an energy scale T0 approaching zero at the critical doping level xc=0.13 at which spin-density wave ordering sets in. In this continuation proposal, we aim to pursue this novel discovery and suggest to determine the doping dependence of T0.
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PIKULSKI Marek; CHANG Johan; N. B. Christensen; LEFMANN Kim; MCMORROW Desmond Francis; MESOT Joel; NIEDERMAYER Christof; Henrik M. Ronnow; SCHMIDT Wolfgang F and UDBY Linda. (2013). Superconductivity and critical spin fluctuations. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1233
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