Doping evolution of nodal electron dynamics in trilayer cuprate superconductor Bi₂Sr₂Ca₂Cu₃O_10+δ revealed by laser-based angle-resolved photoemission spectroscopy

【摘要】 The doping evolution of the nodal electron dynamics in the trilayer cuprate superconductor Bi₂Sr₂Ca₂Cu₃O_10+δ（Bi2223） is investigated using high-resolution laser-based angle-resolved photoemission spectroscopy（ARPES）.Bi2223single crystals with different doping levels are prepared by controlled annealing,which cover the underdoped,optimallydoped and overdoped regions.The electronic phase diagram of Bi2223 is established which describes the T_c dependence on the sample doping level.The doping dependence of the nodal Fermi momentum for the outer（OP） and inner（IP）CuO₂ planes is determined.Charge distribution imbalance between the OP and IP CuO₂ planes is quantified,showing enhanced disparity with increasing doping.Nodal band dispersions demonstrate a prominent kink at ～ 94 meV in the IP band,attributed to the unique Cu coordination in the IP plane,while a weaker ～ 60 meV kink is observed in the OP band.The nodal Fermi velocity of both OP and IP bands is nearly constant at ～ 1.62 eV·? independent of doping.These results provide important information to understand the origin of high T_c and superconductivity mechanism in high temperature cuprate superconductors.更多还原

【Abstract】 The doping evolution of the nodal electron dynamics in the trilayer cuprate superconductor Bi₂Sr₂Ca₂Cu₃O_10+δ（Bi2223） is investigated using high-resolution laser-based angle-resolved photoemission spectroscopy（ARPES）.Bi2223single crystals with different doping levels are prepared by controlled annealing,which cover the underdoped,optimallydoped and overdoped regions.The electronic phase diagram of Bi2223 is established which describes the T_c dependence on the sample doping level.The doping dependence of the nodal Fermi momentum for the outer（OP） and inner（IP）CuO₂ planes is determined.Charge distribution imbalance between the OP and IP CuO₂ planes is quantified,showing enhanced disparity with increasing doping.Nodal band dispersions demonstrate a prominent kink at ～ 94 meV in the IP band,attributed to the unique Cu coordination in the IP plane,while a weaker ～ 60 meV kink is observed in the OP band.The nodal Fermi velocity of both OP and IP bands is nearly constant at ～ 1.62 eV·? independent of doping.These results provide important information to understand the origin of high T_c and superconductivity mechanism in high temperature cuprate superconductors.更多还原