APS » PROLA » Phys. Rev. Lett. » Volume 76 » Issue 14
< Previous article | Next article >

Phys. Rev. Lett. 76, 2579 - 2582 (1996)

Singularities in Optical Spectra of Quantum Spin Chains

Download: PDF (161 kB) or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

H. Suzuura, H. Yasuhara, A. Furusaki, N. Nagaosa, and Y. Tokura
Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan

Received 5 January 1996

The midinfrared optical absorption spectrum is reported of the one-dimensional Mott insulator Sr2CuO3. The spectrum has an asymmetric cusplike structure at 0.48 eV and is analyzed in terms of the phonon-assisted absorption in the one-dimensional quantum spin chain model. A good agreement is obtained between experiment and theory, and the exchange energy J is estimated to be J≈0.26 eV, which is consistent with the magnetic susceptibility measurement.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.76.2579
DOI: 10.1103/PhysRevLett.76.2579
PACS: 75.40.Gb, 75.50.Ee, 78.30.Hv

[ Abstract  |  Previous article  |  Next article  |  Issue 14 ]