Linear temperature dependence of resistivity and change in the Fermi surface at the pseudogap critic
Author: ["R. Daou","Nicolas Doiron-Leyraud","David LeBoeuf","S. Y. Li","Francis Laliberté","Olivier Cyr-Choinière","Y. J. Jo","L. Balicas","J.-Q. Yan","J.-S. Zhou","J. B. Goodenough","Louis Taillefer"]
Publication: Nature Physics
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Abstract
Transport measurements in a high-temperature superconductor provide evidence that the so-called pseudogap phase ends at a quantum critical point located inside the superconducting dome in the phase diagram of cuprates. A fundamental question for high-temperature superconductors is the nature of the pseudogap phase, which lies between the Mott insulator at zero doping and the Fermi liquid at high doping p (refs 1, 2). Here we report on the behaviour of charge carriers near the zero-temperature onset of this phase, namely at the critical doping p*, where the pseudogap temperature T* goes to zero, accessed by investigating a material in which superconductivity can be fully suppressed by a steady magnetic field. Just below p*, the normal-state resistivity and Hall coefficient of La1.6−xNd0.4SrxCuO4 are found to rise simultaneously as the temperature drops below T*, suggesting a change in the Fermi surface with a large associated drop in conductivity. At p*, the resistivity shows a linear temperature dependence as the temperature approaches zero, a typical signature of a quantum critical point3. These findings impose new constraints on the mechanisms responsible for inelastic scattering and Fermi-surface transformation in theories of the pseudogap phase1,4,5,6,7,8.
Cite this article
Daou, R., Doiron-Leyraud, N., LeBoeuf, D. et al. Linear temperature dependence of resistivity and change in the Fermi surface at the pseudogap critical point of a high-Tc superconductor. Nature Phys 5, 31–34 (2009). https://doi.org/10.1038/nphys1109
