Fermi-Liquid Ground State in the n-Type Pr0.91LaCe0.09CuO4−y Copper-Oxide Superconductor

Guo-qing Zheng; T. Sato; Y. Kitaoka; M. Fujita; K. Yamada

doi:10.1103/PhysRevLett.90.197005

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Fermi-Liquid Ground State in the n-Type Pr0.91LaCe0.09CuO4−y Copper-Oxide Superconductor

Guo-qing Zheng, T. Sato, Y. Kitaoka, M. Fujita, K. Yamada

DOI 10.1103/PhysRevLett.90.197005 · Physical Review Letters

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Abstract

We report nuclear magnetic resonance studies on the low-doped n-type copper-oxide Pr0.91LaCe0.09CuO4−y (Tc=24 K) in the superconducting state and in the normal state uncovered by the application of a strong magnetic field. We find that when the superconductivity is removed the underlying ground state is the Fermi liquid state. This result is at variance with that inferred from previous thermal conductivity measurement and appears to contrast with that in p-type copper oxides with a similar doping level where high-Tc superconductivity sets in within the pseudogap phase. The data in the superconducting state are consistent with the line-node gap model.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pr0.91LaCe0.09CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	unknown
Pr1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown