Electron-phonon anomaly related to charge stripes: Static stripe phase versus optimally doped superconducting La 1.85Sr 0.15 CuO 4

Dmitri Reznik, L. Pintschovius, M. Fujita, K. Yamada, G. D. Gu, J. M. Tranquada

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Inelastic neutron scattering was used to study the Cu-O bond-stretching vibrations in optimally doped La 1.85Sr 0.15 CuO 4(T c = 35 K) and in two other cuprates showing static stripe order at low temperatures, i.e., La 1.48 Nd 0.4Sr 0.12CuO 4 and La 1.875 Ba 0.125CuO 4. All three compounds exhibit a very similar phonon anomaly, which is not predicted by conventional band theory. It is argued that the phonon anomaly reflects a coupling to charge inhomogeneities in the form of stripes, which remain dynamic in superconducting La 1.85Sr 0.15CuO 4 down to the lowest temperatures. These results show that the phonon effect indicating stripe formation is not restricted to a narrow region of the phase diagram around the so-called 1/8 anomaly but occurs in optimally doped samples as well.

Original languageEnglish
Pages (from-to)353-364
Number of pages12
JournalJournal of Low Temperature Physics
Volume147
Issue number3-4
DOIs
Publication statusPublished - 2007 May

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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