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Doping dependence of softening in the bond-stretching phonon mode of La$$_{2-x}$$Sr$$_x$$CuO$$_4$$ (0$$leq x leq$$0.29)

Fukuda, Tatsuo; Mizuki, Junichiro; Ikeuchi, Kazuhiko*; Yamada, Kazuyoshi*; Baron, A. Q. R.*; Tsutsui, Satoshi*

Phonons along the [100] direction, in particular the highest energy Cu-O bond-stretching LO mode, of La$$_{2-x}$$Sr$$_x$$CuO$$_4$$ have been studied by inelastic X-ray scattering experiments. The LO phonon mode in the $$x$$ = 0.12 sample shows significant softening similar to early neutron studies. We show here a recovery of the softening was found in the $$x$$ = 0.29 sample, where superconductivity degrades and normal metallic conductivity dominates. The results suggest one-to-one correspondence between the softening of this LO phonon and the superconductivity.

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Category:Materials Science, Multidisciplinary

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