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Quasiparticle interference and charge order in a heavily overdoped non-superconducting cuprate
Xintong Li, Ying Ding, Chaocheng He +8
One of the key issues in unraveling the mystery of high Tc superconductivity in the cuprates is to understand the normal state outside the superconducting dome. Here we perform sca…
Visualizing the periodic modulation of Cooper pairing in a severely underdoped cuprate
Wei Ruan, Xintong Li, Cheng Hu +6
A major obstacle in understanding the mechanism of Cooper pairing in the cuprates is the existence of various intertwined orders associated with spin, charge, and Cooper pairs. Of…
Structural phase transition and electronic structure evolution in Ir1-xPtxTe2 studied by scanning tunneling microscopy
Wei Ruan, Peizhe Tang, Aifang Fang +6
The IrTe2 transition metal dichalcogenide undergoes a series of structural and electronic phase transitions when doped with Pt. The nature of each phase and the mechanism of the ph…
Strong similarities between the local electronic structure of insulating iron pnictide and lightly doped cuprate
Cun Ye, Wei Ruan, Peng Cai +4
One of the major puzzles regarding unconventional superconductivity is how some of the most interesting superconductors are related to an insulating phase that lies in close proxim…
Doping dependence of the anisotropic quasiparticle interference in NaFe1-xCoxAs iron-based superconductors
Peng Cai, Wei Ruan, Xiaodong Zhou +5
We use scanning tunneling microscopy to investigate the doping dependence of quasiparticle interference (QPI) in NaFe1-xCoxAs iron-based superconductors. The goal is to study the r…
High temperature superconductivity: Cooper pairs in trap
Wei Ruan
The tremendous efforts to unveil high temperature superconductivity (HTSC) have been devoted to the search of the mechanism underlying Cooper pairs which, however, remains a myster…
Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1-xCoxAs
Peng Cai, Xiaodong Zhou, Wei Ruan +4
Although the origin of high temperature superconductivity in the iron pnictides is still under debate, it is widely believed that magnetic interactions or fluctuations play an impo…
Evolution from unconventional spin density wave to superconductivity and a novel gap-like phase in NaFe1-xCoxAs
Xiaodong Zhou, Peng Cai, Aifeng Wang +6
Similar to the cuprate high TC superconductors, the iron pnictide superconductors also lie in close proximity to a magnetically ordered phase. A central debate concerning the super…
Imaging the coexistence of superconductivity and a charge density modulation in K0.73Fe1.67Se2 superconductor
Peng Cai, Cun Ye, Wei Ruan +5
We report scanning tunneling microscopy studies of the local structural and electronic properties of the iron selenide superconductor K0.73Fe1.67Se2 with TC = 32K. On the atomicall…