TY - JOUR
T1 - Raman-active phonons and their doping dependence in spin-ladder Sr14Cu24O41
AU - Osada, M.
AU - Kakihana, M.
AU - Nagai, I.
AU - Noji, T.
AU - Adachi, T.
AU - Koike, Y.
AU - Bäckström, J.
AU - Käll, M.
AU - Börjesson, L.
PY - 2000/8/1
Y1 - 2000/8/1
N2 - Raman spectra of Sr14-xCaxCu24O41 have been investigated in a number of well-defined single-crystal and polycrystalline samples. From the polarization and doping dependence, and from a comparison with previous reports on isostructural compounds, we identify the (4Ag + 4B1g + 3B2g + B3g) modes that are Raman allowed within the simple Fmmm structure, consisting of two Cu-O sub-lattices. With increasing Ca content, we observe the intensity decrease in the modes involving the atoms of the ladders. This effect, analogous to the CuO2-plane phonons in the high-Tc cuprates, can be attributed to the hole transfer from the chains to the ladders.
AB - Raman spectra of Sr14-xCaxCu24O41 have been investigated in a number of well-defined single-crystal and polycrystalline samples. From the polarization and doping dependence, and from a comparison with previous reports on isostructural compounds, we identify the (4Ag + 4B1g + 3B2g + B3g) modes that are Raman allowed within the simple Fmmm structure, consisting of two Cu-O sub-lattices. With increasing Ca content, we observe the intensity decrease in the modes involving the atoms of the ladders. This effect, analogous to the CuO2-plane phonons in the high-Tc cuprates, can be attributed to the hole transfer from the chains to the ladders.
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U2 - 10.1016/S0921-4534(00)00220-3
DO - 10.1016/S0921-4534(00)00220-3
M3 - Article
AN - SCOPUS:0034251329
SN - 0921-4534
VL - 338
SP - 161
EP - 165
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1
ER -