About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
The curious case of the Cu2+ electron paramagnetic resonance in high-Tc superconductors and related antiferromagnets
Abstract
Possible reasons behind the total absence of EPR signals from divalent copper ions in copper oxide superconductors and related "two-dimensional" antiferromagnetic insulators are explored. The non-observability of the signal in the metallic states can plausibly be attributed to short spin-lattice relaxation times due to spinon-holon scatterings. However, the absence of resonance in the insulators at high temperatures suggests that either the correlation lengths have been grossly underestimated even for compounds with very low Neel temperatures, or straightforward application of the conventional theory of antiferromagnetism is not valid. © 1989.