EXTRACTION OF THE SPIN GLASS CORRELATION LENGTH
EXTRACTION OF THE SPIN GLASS CORRELATION LENGTH
复制标题
自旋玻璃相关长度的提取
DOI：
10.1103/physrevlett.82.438
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发表时间：
1998
影响因子：
8.6
通讯作者：
E. Vincent
中科院分区：
文献类型：
--
作者：
Y. Joh;R. Orbach;G. G. Wood;J. Hammann;E. Vincent
磁场H的变化对自旋玻璃中的势垒的淬灭作用高度小于相应的塞曼能量E_z的变化。S(t)=-dM_{TRM}(t,t_w)/H/{d lnt}的峰随H的位移产生E_z={N_s}{X_fc}{H^2}，其中X_fc为每自旋的场冷磁化率，N_s为参与势垒猝灭（和跃迁）的自旋数。Cu: mn6at的实验研究。在H， T和等待时间t_w的范围内，CdCr_{1.7}In_{0.3}S_4和CdCr_{1.7}In_{0.3}S_4生成相关长度Ksi(t_w，T) ~ {N_s}^{1/3}，由与模拟数值一致的层次模型Ksi(t_w，T)=0.635(t_w}/tau_0)^{0.169T/T_g}或液滴模型Ksi(t_w，T)={10^{-5}}{{[(T/T_g)Ln(t_w/tau_0)]}^{1/0.21}}拟合，该模型对于模拟时间尺度的预因子太小，并且在psi的下限为指数1/psi。
A change in magnetic field H quenches the barriers in a spin glass for heights less than an associated change in Zeeman energy, E_z. The shift of the peak of S(t)=-dM_{TRM}(t,t_w)/H/{d lnt} with H generates E_z={N_s}{X_fc}{H^2}, with X_fc the field cooled magnetic susceptibility per spin, and N_s the number of spins participating in barrier quenching (and barrier hopping). Experiments on Cu:Mn 6at.% and CdCr_{1.7}In_{0.3}S_4 for ranges of H, T, and waiting times t_w generate the correlation length, Ksi(t_w,T) ~ {N_s}^{1/3}, fitted by both the hierarchical model, Ksi(t_w,T)=0.635(t_w}/tau_0)^{0.169T/T_g}, in numerical accord with simulations, or the droplet model, Ksi(t_w,T)={10^{-5}}{{[(T/T_g)Ln(t_w/tau_0)]}^{1/0.21}}, with too small a prefactor for simulation time scales, and exponent 1/psi at the lower limit for psi.