Incoherent inelastic neutron scattering study of the low-frequency phonons in superconducting La1.85Sr0.15CuO4 and antiferromagnetic La2CuO4
M. J. Rosseinsky, K. Prassides, P. Day, A. J. Dianoux
DOI 10.1103/PhysRevB.37.2231 · Physical Review B
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Abstract
The generalized phonon density of states (DOS) has been measured for the ceramic superconductor La1.85Sr0.15CuO4 (T0=38 K) and antiferromagnetic (TN=250 K) La2CuO4 from 0.1–100 meV at temperatures between 250 and 30 K. For the superconductor the phonon spectrum, which was temperature independent over the whole range, contained major peaks at 11.5, 18.5, 23.8, 29.5, 38, 55.2, 78 meV while La2CuO4 had peaks at 12, 18.5 (24), 29.5, 39.8, 57.2, 80 meV. Increased scattering in the range 5–8 meV, the only feature in the DOS of La2CuO4 which had no analogue in the superconductor was most apparent at 250 K decreasing with temperature to become insignificant at 30 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | midpoint |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | onset |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | midpoint |
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