首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Magnetism,spin relaxation and hyperfine interactions of rare earths in RM6Al6(M = Cr,Mn, Cu)
Authors:I Felner  M Seh  I Nowik
Institution:Research Institute of Physics, The Hebrew University, Jerusalem, Israel
Abstract:The systems RM6Al6 (R = rare earth or Y, M = Cr, Mn, Cu, Rh) were studied by magnetization measurements and by Mossbauer spectroscopy of 155Gd, 161Dy, 166Er and 170Yb. The magnetization studies show weak R-R antiferromagnetic exchange interactions in RCu6Al6(Tn)Gd) = 21 K, less than 4 K for all other R and strong crystalline field effects. Similar phenomena are observed in RMn6Al6 and RCr6Al6, however, due to the presence of a Mn or Cr local moment the systems order ferrimagnetically. In RCr6Al6the order temperatures are low Tc ~ 25 K, yet Tc(GdCr6Al6) = 170 K. The Mossbauer studies observations are consistent with the magnetiza results. In the case where Er and Yb are not ordered at 4.1 K, the spectra still show magnetic hyperfine structure however of paramagnetic nature. The spectra yield the hyperfine interaction spin Hamiltonian parameters and the spin relaxation rates. These turn out to be extremely slow (1O8–1O9 sec?1, a very uncommon phenomenon for a concentrated Er or Yb metallic system.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号