Neutron Scattering Study of Soft Phonons and Diffuse Scattering in Insulating La1.95Sr0.05CuO4

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Soft phonons and diffuse scattering in insulating La2-xSrxCuO4 ($x=0.05$) have been studied by the neutron scattering technique. The X-point phonon softens from high temperature towards the structural transition temperature $T_{\text{s}}=410$ K, and the Z-point phonon softens again below 200 K. The Z-point phonon softening persists to low temperature, in contrast to the behavior observed in the superconducting $x=0.15$ compound, in which the Z-point phonon hardens below $T_{\text{c}}$. The diffuse scattering associated with the structural phase transition at 410 K appears at commensurate positions. These results highlight interesting differences between superconducting and insulating samples.
2004-12-15