Anomalous normal state gap in an electron-doped cuprate

Abstract

In the underdoped n-type cuprate Nd2-xCexCuO4, long-ranged antiferromagnetic order reconstructs the Fermi surface, resulting in a putative antiferromagnetic metal with small pockets. Using angle-resolved photoemission spectroscopy, we observe an anomalous energy gap, an order of magnitude smaller than the antiferromagnetic gap, in a wide range of the underdoped regime and smoothly connecting to the superconducting gap at optimal doping. After carefully considering all the known ordering tendencies in tandem with the phase diagram, we hypothesize that the normal state gap in the underdoped n-type cuprates originates from Cooper pairing. The high temperature scale of the normal state gap raises the prospect of engineering higher transition temperatures in the n-type cuprates comparable to that of the p-type cuprates.

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Cited by in corpus (5)

• Pseudogap in electron-doped cuprates: Strong correlation leading to band splitting
• Observation of quasi-steady dark excitons and gap phase in a doped semiconductor
• Correlation between the strength of low-temperature T-linear normal-state resistivity and $T_{\mathrm{c}}$ in overdoped electron-doped cuprate superconductors
• Collective Magnetic Excitations in a Photo-excited Electron-doped Cuprate Superconductor
• Pseudogap in electron-doped cuprates: thermal precursor to magnetism