Normal-state pseudogap in Bi 2 Sr 2 CaCu 2 O 8 characterized by impurity scattering

摘要: A major difficulty in resolving the discrepancies between angle-resolved photoemission spectroscopy (ARPES) studies on normal-state pseudogap and high-precision electronic heat capacity NMR measurements has been that ARPES results are exclusively for ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8}$ while data primarily ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ ${\mathrm{Y}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}.$ Here we determine density of states near Fermi energy from impurity depression ${T}_{c}$ using scaling behavior spin susceptibility entropy above below able to generate full temperature dependence these quantities normal superconducting states. The detailed is almost identical ${\mathrm{Y}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ showing direct comparison two cuprates valid.