IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
Phys Rev Lett. 2011 Aug 26;107(9):097201. doi: 10.1103/PhysRevLett.107.097201. Epub 2011 Aug 22.
A thermodynamic method to extract the interchain coupling (IC) of spatially anisotropic 2D or 3D spin-1/2 systems from their empirical saturation field H(s) (T=0) is proposed. Using modern theoretical methods we study how H(s) is affected by an antiferromagnetic (AFM) IC between frustrated chains described in the J(1)-J(2)-spin model with ferromagnetic 1st and AFM 2nd neighbor in-chain exchange. A complex 3D-phase diagram has been found. For Li(2)CuO(2) and Ca(2)Y(2)Cu(5)O(10), we show that H(s) is solely determined by the IC and predict H(s)≈61 T for the latter. With H(s)≈55 T from magnetization data one reads out a weak IC for Li(2)CuO(2) close to that obtained from inelastic neutron scattering.
提出了一种从经验饱和场 H(s)(T=0)中提取空间各向异性二维或三维自旋 1/2 系统链间耦合 (IC) 的热力学方法。利用现代理论方法，我们研究了在具有铁磁 1 近邻和反铁磁 2 近邻链内交换的 J(1)-J(2)-自旋模型中描述的受挫链之间的反铁磁 IC 如何影响 H(s)。发现了一个复杂的 3D 相图。对于 Li(2)CuO(2)和 Ca(2)Y(2)Cu(5)O(10)，我们表明 H(s)仅由 IC 决定，并预测后者的 H(s)≈61 T。根据磁化数据得到的 H(s)≈55 T，可以得出 Li(2)CuO(2)的弱 IC，接近从非弹性中子散射获得的结果。
