%0 Book Section %1 statphys23_0032 %A Syromyatnikov, A.V. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K bose-enstein condensation criticality magnons quantum statphys23 topic-8 %T Bose-Einstein condensation of magnons in magnets with predominant ferromagnetic interaction %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=32 %X We discuss Bose-Einstein condensation of magnons (BEC) in magnets with predominant ferromagnetic (FM) interaction in magnetic field $H$ near saturation ($H_c$). Because $H_c$ is independent of FM couplings, magnetic materials of this type can have small $H_c$ that makes them promising candidates for experimental investigation of BEC. Ferromagnets with easy-plane anisotropy and antiferromagnets (AFs) containing weakly coupled FM planes or chains are discussed in detail. We observe small interaction between magnons near the QCP in such magnets, in contrast to AFs with strong AF coupling previously discussed. In particular, this smallness allows us to find crossovers in the critical temperature $T_c(H)(H_c-H)^1/\phi$ from $\phi=3/2$ to $\phi=1$ in quasi-1D magnets, and from $\phi=3/2$ to $\phi\approx1$ ($T_cT_cH_c-H$) in quasi-2D ones.

@incollection{statphys23_0032, abstract = {We discuss Bose-Einstein condensation of magnons (BEC) in magnets with predominant ferromagnetic (FM) interaction in magnetic field $H$ near saturation ($H_c$). Because $H_c$ is independent of FM couplings, magnetic materials of this type can have small $H_c$ that makes them promising candidates for experimental investigation of BEC. Ferromagnets with easy-plane anisotropy and antiferromagnets (AFs) containing weakly coupled FM planes or chains are discussed in detail. We observe small interaction between magnons near the QCP in such magnets, in contrast to AFs with strong AF coupling previously discussed. In particular, this smallness allows us to find crossovers in the critical temperature $T_c(H)\propto (H_c-H)^{1/\phi}$ from $\phi=3/2$ to $\phi=1$ in quasi-1D magnets, and from $\phi=3/2$ to $\phi\approx1$ ($T_c\ln T_c\propto H_c-H$) in quasi-2D ones.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Syromyatnikov, A.V.}, biburl = {https://www.bibsonomy.org/bibtex/29ae6be2b6934082ae2dbd4c39e3fcb64/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {36e2caf9f34ce5f64f5e821c910e3e82}, intrahash = {9ae6be2b6934082ae2dbd4c39e3fcb64}, keywords = {bose-enstein condensation criticality magnons quantum statphys23 topic-8}, month = {9-13 July}, timestamp = {2007-06-20T10:16:10.000+0200}, title = {Bose-Einstein condensation of magnons in magnets with predominant ferromagnetic interaction}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=32}, year = 2007 }