Is La1.85Y0.15CuO4 an oxygen-doped cuprate superconductor?
W. Yu, B. Liang, P. Li, S. Fujino, T. Murakami, I. Takeuchi, R. L., Greene
TL;DR
This study investigates the nature of superconductivity in La1.85Y0.15CuO4, revealing it arises from oxygen doping in a Mott insulator rather than a metallic state, through comprehensive transport measurements.
Contribution
It provides evidence that superconductivity in LYCO is due to oxygen doping of a Mott insulator, challenging previous metallic band theories.
Findings
Superconductivity in LYCO is oxygen-doped from a Mott insulator.
Transport measurements support a Mott insulator origin.
Superconductivity does not originate from a weakly correlated metal.
Abstract
We report resistivity, Hall effect, Nernst effect, and magnetoresistance measurements on T'-phase La1.85Y0.15CuO (LYCO) films prepared by pulsed laser deposition under different oxygen conditions. Our results show that superconductivity in LYCO originates from an oxygen-doped Mott-like insulator and not from a weakly correlated, half-filled band metal as proposed previously.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Superconductivity in MgB2 and Alloys · Advanced Condensed Matter Physics