Nodeless Superconducting Phase Arising from a Strong (π, π) Antiferromagnetic Phase in the Infinite-Layer Electron-Doped Sr1−xLaxCuO2 Compound

John W. Harter; Luigi Maritato; Daniel E. Shai; Eric J. Monkman; Yuefeng Nie; Darrell G. Schlom; Kyle M. Shen

doi:10.1103/PhysRevLett.109.267001

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Nodeless Superconducting Phase Arising from a Strong (π, π) Antiferromagnetic Phase in the Infinite-Layer Electron-Doped Sr1−xLaxCuO2 Compound

John W. Harter, Luigi Maritato, Daniel E. Shai, Eric J. Monkman, Yuefeng Nie, Darrell G. Schlom, Kyle M. Shen

DOI 10.1103/PhysRevLett.109.267001 · Physical Review Letters

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Abstract

The asymmetry between electron and hole doping remains one of the central issues in high-temperature cuprate superconductivity, but our understanding of the electron-doped cuprates has been hampered by apparent discrepancies between the only two known families: Re2−xCexCuO4 and A1−xLaxCuO2. Here we report in situ angle-resolved photoemission spectroscopy measurements of epitaxially stabilized Sr1−xLaxCuO2 thin films synthesized by oxide molecular-beam epitaxy. Our results reveal a strong coupling between electrons and (π, π) antiferromagnetism that induces a Fermi surface reconstruction which pushes the nodal states below the Fermi level. This removes the hole pocket near (π/2, π/2), realizing nodeless superconductivity without requiring a change in the symmetry of the order parameter and providing a universal understanding of all electron-doped cuprates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	unknown