Neutron scattering study of soft optical phonons in La2-xSrxCuO4-y

T. R. Thurston, R. J. Birgeneau, D. R. Gabbe, H. P. Jenssen, M. A. Kastner, P. J. Picone, N. W. Preyer, J. D. Axe, P. Böni, G. Shirane, M. Sato, K. Fukuda, S. Shamoto

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Abstract

The soft optical phonons associated with the tetragonal-to-orthorhombic structural phase transition in La2-xSrxCuO4-y have been investigated using inelastic-neutron-scattering techniques. Single crystals with Sr concentration of x=0, 0.08, and 0.14 were studied. Both branches of the doubly degenerate X-point phonon which go soft at the tetragonal-to-orthorhombic transition have been observed in the orthorhombic phase. In all three samples one branch hardens, while the other remains relatively soft with behavior indicative of a further incipient structural phase transition. We identify the hard and soft branches of the orthorhombic phase as zone center and zone-boundary phonons, respectively. The zone-center mode has Ag symmetry and is, consequently, Raman active. The relation of these measurements to other structural properties and to the superconductivity in La2-xSrxCuO4-y is discussed.

Original languageEnglish
Pages (from-to)4327-4333
Number of pages7
JournalPhysical Review B
Volume39
Issue number7
DOIs
Publication statusPublished - 1989

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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