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

*この研究の対応する著者

研究成果: Article査読

4 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号134502
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
74
13
DOI
出版ステータスPublished - 2006
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学

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