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

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15 Citations (Scopus)

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 0.1100 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 58 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.

Original languageEnglish
Pages (from-to)2231-2234
Number of pages4
JournalPhysical Review B
Volume37
Issue number4
DOIs
Publication statusPublished - 1988 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics

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