%0 Journal Article
%J Physical Review Letters
%D 2012
%T Magnetic Susceptibility of Collinear and Noncollinear Heisenberg Antiferromagnets
%A Johnston, D. C.
%K crystal
%K MNF2
%K phase-transition
%K rbcucl3
%K triangular-lattice
%M WOS:000307709400038
%P 077201
%R 10.1103/PhysRevLett.109.077201
%U ://WOS:000307709400038
%V 109
%X Predictions of the anisotropic magnetic susceptibility chi below the antiferromagnetic (AFM) ordering temperatures T-N of local moment Heisenberg AFMs have been made previously using molecular field theory (MFT) but are very limited in their applicability. Here a MFT calculation of chi(T <= T-N) is presented for a wide variety of collinear and noncollinear Heisenberg AFMs containing identical crystallographically equivalent spins without recourse to magnetic sublattices. The results are expressed in terms of directly measurable experimental parameters and are fitted with no adjustable parameters to experimental chi(T <= T-N) data from the literature for several collinear and noncollinear AFMs. The influence of spin correlations and fluctuations beyond MFT is quantified by the deviation of the theory from the data. The origin of the universal chi(T <= T-N) observed for triangular lattice AFMs exhibiting coplanar noncollinear 120 degrees AFM ordering is clarified.
%Z ISI Document Delivery No.: 991NWTimes Cited: 0Cited Reference Count: 24Johnston, D. C.U. S. Department of Energy, Office of Basic Energy Sciences[DE-AC02-07CH11358]The author is grateful to A. Honecker and M. E. Zhitomirsky for insights about the chi of triangular lattice AFMs and to S. L. Bud'ko and H. Tanaka for communicating chi(T) data. This research at Ames Laboratory was supported by the U. S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-07CH11358.Amer physical socCollege pk
%8 08
%9 Article
%@ 0031-9007