TY - JOUR
T1 - Effects of random fields on bicritical phase diagrams in two and three dimensions
AU - Birgeneau, R. J.
AU - Aharony, A.
AU - Cowley, R. A.
AU - Hill, J. P.
AU - Pelcovits, R. A.
AU - Shirane, G.
AU - Thurston, T. R.
N1 - Funding Information:
The research at MIT was supported by the National Science Foundation under Grant No. DMR90-07825. Work at Tel Aviv was supported by the US-Israel Binational Science Foundation. Research at Brookhaven is supported by the Department of Energy under contract DE-AC02-76CH00016.
PY - 1991/9/15
Y1 - 1991/9/15
N2 - Stimulated by the pioneering work of Michael Fisher and collaborators on bicritical phase diagrams in pure systems, we consider the corresponding behavior in systems with uniaxial random fields. We discuss experiments in the two- and three-dimensional n = 3 systems Rb2Mn0.7Mg0.3F4 and Mn0.75Zn0.25F2, respectively. We also report a new theory for the 2D n = 3 system, which predicts a novel phase boundary geometry. In both two and three dimensions the Ising component is dominated by metastability effects. However, the XY component shows a reversible transition to long range order. Experiments in the bicritical region in Mn0.75Zn0.25F2 are inconclusive. However, the theory describes the measured XY phase boundary in Rb2Mn0.7Mg0.3F4 quite well.
AB - Stimulated by the pioneering work of Michael Fisher and collaborators on bicritical phase diagrams in pure systems, we consider the corresponding behavior in systems with uniaxial random fields. We discuss experiments in the two- and three-dimensional n = 3 systems Rb2Mn0.7Mg0.3F4 and Mn0.75Zn0.25F2, respectively. We also report a new theory for the 2D n = 3 system, which predicts a novel phase boundary geometry. In both two and three dimensions the Ising component is dominated by metastability effects. However, the XY component shows a reversible transition to long range order. Experiments in the bicritical region in Mn0.75Zn0.25F2 are inconclusive. However, the theory describes the measured XY phase boundary in Rb2Mn0.7Mg0.3F4 quite well.
UR - http://www.scopus.com/inward/record.url?scp=3042888503&partnerID=8YFLogxK
U2 - 10.1016/0378-4371(91)90134-X
DO - 10.1016/0378-4371(91)90134-X
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AN - SCOPUS:3042888503
SN - 0378-4371
VL - 177
SP - 58
EP - 66
JO - Physica A: Statistical Mechanics and its Applications
JF - Physica A: Statistical Mechanics and its Applications
IS - 1-3
ER -