Low-temperature dynamics of incommensurate biphenyl as probed by spectral hole burning
Institute of Physics, Riia 142 - EE2400 Tartu, Estonia
2 University of Tartu, Institute of Materials Science, Tähe 4 - EE2400 Tartu, Estonia
3 Technische Universität München, Lehrstuhl für Physik Weihenstephan, D-85350 Freising, Germany
Accepted: 14 October 1998
We have measured the temperature dependence of the homogeneous width of spectral holes in the incommensurate phase III of chlorin-doped biphenyl from 60 mK to 10 K. Below 2 K a power law (, for different spectral peaks) prevails. Above 2 K a strong coupling to low-energy (5 and ) vibrational modes dominates. No indication of a low-temperature lock-in transition was found.
PACS: 61.44.Fw – Incommensurate crystals / 78.40.-q – Absorption and reflection spectra: visible and ultraviolet / 33.70.Jg – Line and band widths, shapes, and shifts
© EDP Sciences, 1998