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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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

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Phonon scattering
Ladders
ladders
Raman scattering
Raman spectra
Crystals
probes
crystals
Charge density waves
Hole mobility
Excitation energy
hole mobility
Light polarization
Temperature
polarized light
Charge transfer
calcium
Calcium
Substitution reactions
charge transfer

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Holmlund, J., Andreasson, J., Knee, C. S., Bäckström, J., Käll, M., Osada, 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

Resonant two-phonon Raman scattering as a probe of hole crystal formation in Sr14-x Cax Cu24 O41. / Holmlund, Joakim; Andreasson, Jakob; Knee, Christopher S.; Bäckström, Joakim; Käll, Mikael; Osada, Minoru; Noji, Takashi; Koike, Yoji; Kakihana, Masato; Börjesson, Lars.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 74, No. 13, 134502, 2006.

Research output: Contribution to journalArticle

Holmlund, J, Andreasson, J, Knee, CS, 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, vol. 74, no. 13, 134502. https://doi.org/10.1103/PhysRevB.74.134502
Holmlund, Joakim ; Andreasson, Jakob ; Knee, Christopher S. ; Bäckström, Joakim ; Käll, Mikael ; Osada, Minoru ; Noji, Takashi ; Koike, Yoji ; Kakihana, Masato ; Börjesson, Lars. / Resonant two-phonon Raman scattering as a probe of hole crystal formation in Sr14-x Cax Cu24 O41. In: Physical Review B - Condensed Matter and Materials Physics. 2006 ; Vol. 74, No. 13.
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