Charge-density wave formation in Sr14-xCaxCu24O41

Article

关键词: LADDER COMPOUNDS SR14-XCAXCU24O41;    HOLE-DOPED LADDERS;    OPTICAL-PROPERTIES;    SR14CU24O41;    SPIN;    SUPERCONDUCTIVITY;    SR14-XCA(X)CU24O41;    CONDUCTIVITY;    SPECTROSCOPY;    TRANSPORT;   

DOI  :  10.1103/PhysRevB.66.060508

来源: SCIE

【 摘 要 】

The electrodynamic response of the spin-ladder compound Sr14-xCaxCu24O41(x=0,3,9) has been studied from radio frequencies up to the infrared. At temperatures below 250 K a pronounced absorption peak appears around 12 cm(-1) in Sr14Cu24O41 for the radiation polarized along the chains/ladders (Eparallel toc). In addition a strongly temperature-dependent dielectric relaxation is observed in the kHz - MHz range. We explain this behavior by a charge-density wave which develops in the ladders and produces a phason mode pinned at 12 cm(-1). With increasing x the mode shifts up in frequency and eventually disappears for x=9 because the dimensionality of the system crosses over from one to two dimensions, giving way to the superconducting ground state under pressure.

【 授权许可】

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