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, In the single-layer cuprate Bi2201, the pseudogap critical point is located at very high doping, near the end of the superconducting dome
, The Fermi surface measured by ARPES is also found to change topology from hole-like to electron-like near the end of the superconducting dome
, we get A1 = 0.9 ± 0.2 ?? cm / K. Dividing by the interlayer spacing, which is two times larger in Bi2201 than in LSCO, we get A1 ? = 8 ± 2 ? / K. Remarkably, this is the same value, within error bars, as in Bi2212 and Nd-LSCO, all at their respective critical dopings, Taking the average of those two values, consistent with typical error bars on geometric factors (±15%)
, With increasing field to suppress superconductivity, ? increases from 6 mJ / K 2 mol at H = 0 to 8 mJ / K 2 mol at H = 6 T, and is estimated to reach 10 mJ / K 2 mol at the critical field Hc2 = 18 T [48]. Given the uncertainty in the latter estimation, we take ? = 10 ± 2 mJ / K 2 mol , which yields m* = 7 ± 1.5 m0. Note that ? may be somewhat larger at the slightly higher doping, We can estimate m* from specific heat data measured on a Bi2201 crystal with Tc = 19 K [48], at a doping slightly below p*, vol.46
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