Universality tests at Heisenberg bicritical points
- 30 June 1980
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 13 (18) , L459-L464
- https://doi.org/10.1088/0022-3719/13/18/003
Abstract
Recent experiments on MnF2 (King and Rohrer, 1976, 1979) suggest Q=1.56+or-0.35 for the amplitude ratio determining how the critical lines meet at the spin-flop bicritical point, in serious disagreement with the original prediction of Q approximately=2.5>2.2 for universal Heisenberg (n=3) bicriticality. The authors report extensive two-variable series calculations using constrained partial differential approximants, which yield Q=2.34+or-0.08. In addition it is shown that the natural least-squares fitting procedures may be strongly biased even for data of high precision.Keywords
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