By Michael E. Fisher (auth.), R. Pynn, A. Skjeltorp (eds.)

This e-book contains the lawsuits of a NATO complex learn Institute on Mu1ticritica1 Phenomena held in Geilo, Norway, among 10-21 April 1983. this college was once the 7th to be held in Gei10, on a variety of facets of part transitions. even with its it sounds as if restrictive name the college was once deliberate as a discussion board for the discus­ sion of section transitions and instabilities in structures, with competing interactions and competing order parameters. therefore, as well as the canonical multicritical issues, matters have been various as severe phenomena in random magnetic structures and routes to chaos have been mentioned. the subject material of the college is of course divided right into a sequence of different types which to some degree, replicate the old improvement of curiosity in competing phenomena at section transitions. Multicritical issues in equilibrium platforms, outlined phenomenolo­ gically as issues of unexpected switch of behaviour on an another way soft section boundary, have been the 1st themes of the varsity. The theo­ retical consensus which has emerged in the past decade, mostly due to calculations with the renormalisation workforce, used to be reviewed in a few element. the implications provided, even if, practice merely to natural platforms (in which airborne dirt and dust and different manifestations of truth are beside the point) in that small realm just about the part transition knoYln as "asymtopia.

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Extra info for Multicritical Phenomena: Proceedings of a NATO Advanced Study Institute on Multicritical Phenomena, held April 10–21, 1983, in Geilo, Norway

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The order-disorder phase boundary Tc(H) was determined by Shapira and Becerra. 29 The results are shown in Fig. 6. Note that the ordinate is H, and not H2. The phase boundary is bow-shaped, as predicted by FNK. A fit to Eq. 08. The same phase boundary 46 Y. SHAPIRA was determined later by Shapira and Oliveira, using another technique. 3D The data were very close to those in Fig. 6. 045. 25. The experimental values for the coefficient b in Eq. (4) agreed with an independent estimate (analogous to Fisher's estimate of q).

Aharony and M. E. Fisher, Phys. Rev. B 27, 4394 (1983). J. C. Norvell, W. P. Wolf, L. M. Corliss, J. M. Hastings, and R. Nathans, Phys. Rev. 186, 557 (1969). M. Steiner and N. Giordano, Phys. Rev. B~, 6886 (1982). EXPERIMENTAL STUDIES OF BICRITICAL POINTS IN 3D ANTIFERROMAGNETS Y. Shapira Francis Bitter National Magnet Laboratory Massachusetts Institute of Technology Cambridge, MA 02139, USA INTRODUCTION The theoretical work of Fisher, Nelson, and Koster1itzl- 3 on the bicritica1 point (BCP) of a 3d antiferromagnet has stimulated many experimental investigations.

Optimum accumulation of M~t and M~t data, scaled according to Eq. (7) to yield the scaling fUI1ctions Mil and Mi. ~. xc=O for M_, and xc=l for~. [After Basten, Frikkee and de Jonge, Phys Rev B~, 1429 (1980)]. Y. SHAPIRA 50 A detailed test of the extended scaling assumption was performed by Basten et al. who measured the staggered magnetization of CsMnBr 3 2D 2 0 using neutron scattering. 26 As noted, although this is a pseudo-Id material, its behavior near the BCP (n=2) can be interpreted using the theory for 3d.

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