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Disappearance of Superconductivity and a Concomitant Lifshitz Transition in Heavily Overdoped Bi_2Sr_2CuO_6 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy 下载免费PDF全文
丁颖 赵林 闫宏涛 高强 刘静 胡成 黄建伟 李聪 徐煜 蔡永青 戎洪涛 吴定松 宋春尧 周花雪 董晓莉 刘国东 王庆艳 张申金 王志敏 张丰丰 杨峰 彭钦军 许祖彦 陈创天 周兴江 《中国物理快报》2019,(1)
By partially doping Pb to effectively suppress the superstructure in single-layered cuprate Bi_2Sr_2CuO_(6+δ)(Pb-Bi2201) and annealing them in vacuum or in high pressure oxygen atmosphere, a series of high quality Pb-Bi2201 single crystals are obtained with T_c covering from 17 K to non-superconducting in the overdoped region. High resolution angle resolved photoemission spectroscopy measurements are carried out on these samples to investigate the evolution of the Fermi surface topology with doping in the normal state. Clear and complete Fermi surfaces are observed and quantitatively analyzed in all of these overdoped Pb-Bi2201 samples. A Lifshitz transition from holelike Fermi surface to electron-like Fermi surface with increasing doping is observed at a doping level of ~0.35. This transition coincides with the change that the sample undergoes superconducting-to-non-superconducting states.Our results reveal the emergence of an electron-like Fermi surface and the existence of a Lifshitz transition in heavily overdoped Bi2201 samples. This provides important information in understanding the connection between the disappearance of superconductivity and the Lifshitz transition in the overdoped region. 相似文献
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王渊 刘以轩 郝占阳 程文静 邓竣泽 王郁欣 顾雨豪 马小明 戎洪涛 张发远 郭抒 张成成 江志诚 杨逸尘 刘万领 姜琦 刘正太 叶茂 沈大伟 刘毅 崔胜涛 王乐 刘才 林君浩 刘影 蔡永青 朱金龙 陈朝宇 梅佳伟 《中国物理快报》2023,(3):43-51
The simple kagome-lattice band structure possesses Dirac cones, flat band, and saddle point with van Hove singularities in the electronic density of states, facilitating the emergence of various electronic orders. Here we report a titanium-based kagome metal CsTi3Bi5 where titanium atoms form a kagome network, resembling its isostructural compound CsV3Sb5. Thermodynamic properties including the magnetization, resistance, and heat capacity reveal the co... 相似文献
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Electronic Evolution from the Parent Mott Insulator to a Superconductor in Lightly Hole-Doped Bi2Sr2CaCu2O8+σ 下载免费PDF全文
High temperature superconductivity in cuprates is realized by doping the Mott insulator with charge carriers. A central issue is how such an insulating state can evolve into a conducting or superconducting state when charge carriers are introduced. Here, by in situ vacuum annealing and Rb deposition on the Bi2Sr2Ca0.6Dy0.4Cu2O8+σ(Bi2212) sample surface to push its doping level continuously from deeply underdoped(Tc = 25... 相似文献
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