Journal of Low Temperature Physics

, Volume 147, Issue 3, pp 353–364

Electron-Phonon Anomaly Related to Charge Stripes: Static Stripe Phase Versus Optimally Doped Superconducting La1.85Sr0.15CuO4


    • Institut für FestkörperphysikForschungszentrum Karlsruhe
    • Laboratoire Léon BrillouinCE Saclay
  • L. Pintschovius
    • Institut für FestkörperphysikForschungszentrum Karlsruhe
  • M. Fujita
    • Institute for Material ResearchTohoku University
  • K. Yamada
    • Institute for Material ResearchTohoku University
  • G. D. Gu
    • Physics DepartmentBrookhaven National Laboratory
  • J. M. Tranquada
    • Physics DepartmentBrookhaven National Laboratory

DOI: 10.1007/s10909-007-9318-9

Cite this article as:
Reznik, D., Pintschovius, L., Fujita, M. et al. J Low Temp Phys (2007) 147: 353. doi:10.1007/s10909-007-9318-9

Inelastic neutron scattering was used to study the Cu-O bond-stretching vibrations in optimally doped La1.85Sr0.15CuO4 (Tc = 35 K) and in two other cuprates showing static stripe order at low temperatures, i.e., La1.48Nd0.4Sr0.12CuO4 and La1.875Ba0.125CuO4. 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 La1.85Sr0.15CuO4 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.

Copyright information

© Springer Science+Business Media, LLC 2007