Spin diffusion in two-dimensional MnX2−4 antiferromagnets with dipolar broadening

✍ Scribed by T.T.P. Cheung; K.T. McGregor; Z.G. Soos

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 458 KB
• Volume: 61
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(79)87149-3

✦ Synopsis

Comparison of the exchange-narroaed

EPR linewidths AHof single crystals of K2XInF4 and f.3-propanediammonium JInCi4, both of which are two-dimensional antiferromamets with comparable isotropic exchange, yields direct evidence for spin diffusion due to the 4 = 0 secular dipolar term, with its cbamcteristic (3 cos2e -l)* angular dependence. A genem,l sczkling argument is developed for AH in isostructural systems wivith dipoku broadening in order to identify diffusive costributions and cut offs even when the absorption is lorentzian and the requkd spin correlation functions are not explicitly linOWl.