Abstract
We determine the function of the nonlinear model in dimensions to four-loop order using the recently calculated four-loop-order function and the critical exponent through order . This function determines completely, according to Hikami, the four-loop-order function for a large class of nonlinear models. As an application the conductivity exponent of the Anderson metal-insulator transition is calculated for the unitary case to order . This exponent turns out to be smaller than ½.
- Received 21 July 1986
DOI:https://doi.org/10.1103/PhysRevLett.57.1383
©1986 American Physical Society