Abstract
The critical dynamics of the time-dependent Ginzburg-Landau model for a system with quenched random impurities and nonconserved order parameter is studied in the framework of the expansion. In contrast to the situation in pure systems, the dynamic critical exponent deviates from its conventional value at first order in . The impurities cause an enhancement of the shape function at small frequencies ; diverges as . Below the equation of state, static susceptibility , and dynamic response function , are studied. A new, purely static correlated function, , whose existence is unique to the random system is introduced. The coexistence curve singularities of , , and in systems with continuously broken symmetry are explored. The connection of the quenched-impurity model with "model " of Halperin, Hohenberg, and Ma is discussed.
- Received 2 July 1976
DOI:https://doi.org/10.1103/PhysRevB.15.258
©1977 American Physical Society