We have established the zero-field freezing temperature and Tf(H,) lines associated with a constant relaxation time over a large frequency range (10-2-105 Hz) in Eu0.4Sr0.6S. The choice of the experimental criterion and the demagnetizing field effects are analyzed in some detail in order to establish the validity and the limits of our analysis. Two different scalings are tested as suggested by Binder and Young: Tc=0, ln(0)=T-zf(HT); and Tc 0, 0=(T-Tc)-zg((T-Tc)-(HT)). Both are found to work satisfactorily with the following sets of parameters: for Tc=0 K, z=8, =10.5, and 010-5 s; for Tc=1.50 K, z=7, =2, and 010-7 s. The latter value of 0 appears to be more consistent with previous relaxation data than the former. Hence, our fitting procedure suggests that Tc 0 K (equal to 1.50 K) for Eu0.4Sr0.6S.
ASJC Scopus subject areas
- Condensed Matter Physics