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Resonant two-phonon Raman scattering as a probe of hole crystal formation in Sr14-xCaxCu24O41
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2006 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74Article in journal (Refereed) Published
Abstract [en]

The charge dynamics of the spin ladder compound Sr14-xCaxCu24O41 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 similar to 200 K for light polarized along the ladder layer and with excitation energy close to the charge transfer gap similar to 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.

Place, publisher, year, edition, pages
2006. Vol. 74
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URN: urn:nbn:se:miun:diva-14344OAI: oai:DiVA.org:miun-14344DiVA: diva2:435975
Note
Times Cited: 3Available from: 2011-08-22 Created: 2011-08-19 Last updated: 2011-11-27Bibliographically approved

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Bäckström, Joakim
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