Abstract
The polarization response of the dipolar glass () over a range of temperature () near is found to be a nonanalytic function of field, revealing the inadequacy of the usual nonlinear susceptibility description, as well as the incorrectness of even the linear response previously reported in such systems. A model based upon activated switching of two-level systems with a barrier distribution extending to zero energy adequately describes our data. Nonanalytic response may be a general feature of dipolar glasses, as well as other random systems, including magnetic spin glasses.
- Received 1 June 1987
DOI:https://doi.org/10.1103/PhysRevB.36.2465
©1987 American Physical Society