Abstract
We report an electron spin resonance (ESR) study on single crystals of the heavy fermion metal which shows pronounced non-Fermi liquid behavior related to a close antiferromagnetic quantum critical point. It is shown that the observed ESR spectra can be ascribed to a bulk resonance. This is the first observation of ESR of the Kondo ion itself in a dense Kondo lattice system. The ESR signal occurs below the Kondo temperature which thus indicates the existence of large unscreened moments below . We observe the spin dynamics as well as the static magnetic properties of the spins to be consistent with the results of nuclear magnetic resonance and magnetic susceptibility.
- Received 12 May 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.156401
©2003 American Physical Society