Evidence for superconductivity in La2CuO4

P. M. Grant; S. S. P. Parkin; V. Y. Lee; E. M. Engler; M. L. Ramirez; J. E. Vazquez; G. Lim; R. D. Jacowitz; R. L. Greene

doi:10.1103/PhysRevLett.58.2482

Evidence for superconductivity in La2CuO4

P. M. Grant, S. S. P. Parkin, V. Y. Lee, E. M. Engler, M. L. Ramirez, J. E. Vazquez, G. Lim, R. D. Jacowitz, R. L. Greene

DOI 10.1103/PhysRevLett.58.2482 · Physical Review Letters

T1

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Abstract

We report evidence for superconductivity in undoped La2CuO4 obtained from resistivity, thermoelectric power, and susceptibility measurements. The onset temperature is near 40 K and we have determined its pressure and field dependence in resistivity. The superconducting behavior is of a trace and filamentary nature and is quite sensitive to stoichiometry. Its occurrence is extremely process dependent and an be controlled by oxygen pressure. We discuss several likely sources for the superconducting activity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure unresolved	onset
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure unresolved	onset
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	50	1 GPa	onset
La2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown