Resonant two-phonon Raman scattering as a probe of hole crystal formation in Sr14-x Cax Cu24 O41

Joakim Holmlund, Jakob Andreasson, Christopher S. Knee, Joakim Bäckström, Mikael Käll, Minoru Osada, Takashi Noji, Yoji Koike, Masato Kakihana, Lars Börjesson

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Abstract

The charge dynamics of the spin ladder compound Sr14-x Cax Cu24 O41 with x=0,6,13.6 has been investigated using wavelength- and temperature-dependent phonon Raman scattering on single crystals. In the unsubstituted, x=0, compound, a set of sharp two-phonon lines shows a strong increase in intensity below T∼200 K for light polarized along the ladder layer and with excitation energy close to the charge transfer gap ∼1.9 eV. The temperature dependence of the strongly enhanced two-phonon bands below 200 K closely follows the recently reported formation of a standing charge density wave in the ladders [P. Abbamonte, Nature 431, 1078 (2004)]. Upon calcium substitution the polarized resonant Raman response rapidly decreases, signaling an increase of hole mobility in the ladder units. Temperature-dependent measurements of the x=13.6 sample indicate mobility of holes down to <8 K.

Original languageEnglish
Article number134502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number13
DOIs
Publication statusPublished - 2006
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Holmlund, J., Andreasson, J., Knee, C. S., Bäckström, J., Käll, M., Osada, M., Noji, T., Koike, Y., Kakihana, M., & Börjesson, L. (2006). Resonant two-phonon Raman scattering as a probe of hole crystal formation in Sr14-x Cax Cu24 O41. Physical Review B - Condensed Matter and Materials Physics, 74(13), [134502]. https://doi.org/10.1103/PhysRevB.74.134502