TY - JOUR
T1 - Momentum-dependent charge excitations of a two-leg ladder
T2 - Resonant inelastic x-ray scattering of (La,Sr,Ca)14 Cu24 O41
AU - Ishii, K.
AU - Tsutsui, K.
AU - Tohyama, T.
AU - Inami, T.
AU - Mizuki, J.
AU - Murakami, Y.
AU - Endoh, Y.
AU - Maekawa, S.
AU - Kudo, K.
AU - Koike, Y.
AU - Kumagai, K.
PY - 2007/7/31
Y1 - 2007/7/31
N2 - Momentum-dependent charge excitations of a two-leg ladder are investigated by resonant inelastic x-ray scattering of (La,Sr,Ca)14 Cu24 O41. In contrast to the case of a square lattice, momentum dependence of the Mott gap excitation of the ladder exhibits little change upon hole doping, indicating the formation of hole pairs. Theoretical calculation based on a Hubbard model qualitatively explains this feature. In addition, experimental data show an intraband excitation as continuum intensity below the Mott gap and it appears at all the momentum transfers simultaneously. The intensity of the intraband excitation is proportional to the hole concentration of the ladder, which is consistent with optical conductivity measurements.
AB - Momentum-dependent charge excitations of a two-leg ladder are investigated by resonant inelastic x-ray scattering of (La,Sr,Ca)14 Cu24 O41. In contrast to the case of a square lattice, momentum dependence of the Mott gap excitation of the ladder exhibits little change upon hole doping, indicating the formation of hole pairs. Theoretical calculation based on a Hubbard model qualitatively explains this feature. In addition, experimental data show an intraband excitation as continuum intensity below the Mott gap and it appears at all the momentum transfers simultaneously. The intensity of the intraband excitation is proportional to the hole concentration of the ladder, which is consistent with optical conductivity measurements.
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U2 - 10.1103/PhysRevB.76.045124
DO - 10.1103/PhysRevB.76.045124
M3 - Article
AN - SCOPUS:34547585705
SN - 1098-0121
VL - 76
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 4
M1 - 045124
ER -