Experimental evidence for the existence of an overlap length in spin glasses

Abstract

Zero-field-cooled magnetization measurements on a Cu(10 at.% Mn) spin glass are reported. The relaxation of the magnetization is recorded after specific temperature variations of the sample in the spin-glass phase. The data are discussed within the framework of new domain theories of the spin-glass phase. A qualitative agreement between the theoretical predictions and the experimental results is found. Specifically, empirical support for the theoretical concept overlap length is given.