Abstract
The midinfrared optical absorption spectrum is reported of the one-dimensional Mott insulator SCu. 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 eV, which is consistent with the magnetic susceptibility measurement.
- Received 5 January 1996
DOI:https://doi.org/10.1103/PhysRevLett.76.2579
©1996 American Physical Society