Spinon excitation spectra of the resonating valence bond states in the high temperature superconducting cuprates

• Published in: Physica. C, Superconductivity Vol. 470; no. SUP1; pp. S94 - S96
• Main Authors: Sugai, S., Takayanagi, Y., Hosokawa, T., Suzuki, H., Hayamizu, N., Muroi, T., Sone, Y., Mabuchi, H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2010; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties; Physics; Properties of type I and type II superconductors; RVB; Spin wave; Spinon; Superconducting cuprate; Superconductivity; Two-magnon Raman scattering; Superconducting cuprate; Two-magnon Raman scattering; Spinon; Spin wave; RVB; Spin waves; High-Tc superconductors; Two magnon process; Carrier density; RVB model; Barium Copper Yttrium Oxides Mixed; Cuprates
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2009.11.087

Magnetic excitations of the resonating valence bond (RVB) states were searched in high temperature superconducting cuprates by Raman scattering. Ho et al. [C.-M. Ho et al., Phys. Rev. Lett. 86 (2001) 1626] disclosed that the spin excitation in the two-dimensional resonating valence bond state has a magnon-like dispersion and a spinon continuum above it. The density of states of the spin excitation has a peak at 1.5J which is lower than the 2.36J of the spin wave. We found that the A1g spectra have a broad peak at 1.5J in common at the underdoped region of p⩽0.15 in LSCO, Bi2201, and Bi2212 and p⩽0.1 in YBCO. The B1g peak and the B2g peak in the two-magnon region have a fine structure of the spin wave. The carrier density dependence is discussed.