Spin fluctuations and superconductivity in Ba2YCu3O6+δ

K. B. Lyons; P. A. Fleury; L. F. Schneemeyer; J. V. Waszczak

doi:10.1103/PhysRevLett.60.732

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Spin fluctuations and superconductivity in Ba2YCu3O6+δ

K. B. Lyons, P. A. Fleury, L. F. Schneemeyer, J. V. Waszczak

DOI 10.1103/PhysRevLett.60.732 · Physical Review Letters

T1

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Abstract

We report observation of spin-pair excitations in Ba2YCu3O6+δ, with δ in the range 0.0–0.9. The frequency of the excitations, and hence the value of the exchange constant, J=950 cm−1, is similar to that reported recently for (nonsuperconducting) La2CuO4. The present observation of magnetic excitations in a superconducting material, and of their evolution as a function of δ, demonstrate a large influence of carrier concentration on the spin-fluctuation dynamics.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba2YCu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60	Pressure not reported	onset
Ba2YCu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	unknown
Ba2YCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92.5	Pressure not reported	unknown