Excitations in Incommensurate Biphenyl: Proton Spin-Lattice Relaxation
- 25 March 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 54 (12) , 1287-1290
- https://doi.org/10.1103/physrevlett.54.1287
Abstract
In the upper incommensurate phase of biphenyl, spin relaxation is relatively rapid, because of low-frequency excitations (phasons). The relaxation follows ; this is the first report of a Larmor-frequency dependence of in an incommensurately distorted solid. The frequency dependence suggests that the phasons are gapless. In the low-temperature incommensurate phase, peaks in are evident at low frequencies. The motion responsible is thermally activated and may kinetically inhibit commensuration.
Keywords
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