Momentum-dependent charge excitations of a two-leg ladder: Resonant inelastic x-ray scattering of (La,Sr,Ca)14 Cu24 O41

K. Ishii, K. Tsutsui, T. Tohyama, T. Inami, J. Mizuki, Y. Murakami, Y. Endoh, S. Maekawa, K. Kudo, Y. Koike, K. Kumagai

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Abstract

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.

Original languageEnglish
Article number045124
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number4
DOIs
Publication statusPublished - Jul 31 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ishii, K., Tsutsui, K., Tohyama, T., Inami, T., Mizuki, J., Murakami, Y., Endoh, Y., Maekawa, S., Kudo, K., Koike, Y., & Kumagai, K. (2007). Momentum-dependent charge excitations of a two-leg ladder: Resonant inelastic x-ray scattering of (La,Sr,Ca)14 Cu24 O41. Physical Review B - Condensed Matter and Materials Physics, 76(4), [045124]. https://doi.org/10.1103/PhysRevB.76.045124