Critical Doping for the Onset of Fermi-Surface Reconstruction by Charge-Density-Wave Order in the Cuprate Superconductor LaSrCuO
arXiv:1512.00292 · doi:10.1103/PhysRevX.6.021004
Abstract
The Seebeck coefficient of the cuprate superconductor LaSrCuO (LSCO) was measured in magnetic fields large enough to access the normal state at low temperatures, for a range of Sr concentrations from to . For , 0.12, 0.125 and 0.13, decreases upon cooling to become negative at low temperatures. The same behavior is observed in the Hall coefficient . In analogy with other hole-doped cuprates at similar hole concentrations , the negative and show that the Fermi surface of LSCO undergoes a reconstruction caused by the onset of charge-density-wave modulations. Such modulations have indeed been detected in LSCO by X-ray diffraction in precisely the same doping range. Our data show that in LSCO this Fermi-surface reconstruction is confined to . We argue that in the field-induced normal state of LSCO, charge-density-wave order ends at a critical doping , well below the pseudogap critical doping .
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