Phys. Rev. Lett. 91, 156401 (2003) [4 pages]Low Temperature Electron Spin Resonance of the Kondo Ion in a Heavy Fermion Metal: YbRh2Si2Received 12 May 2003; published 6 October 2003 We report an electron spin resonance (ESR) study on single crystals of the heavy fermion metal YbRh2Si2 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 Yb3+ 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 (TK) which thus indicates the existence of large unscreened Yb3+ moments below TK. We observe the spin dynamics as well as the static magnetic properties of the Yb3+ spins to be consistent with the results of nuclear magnetic resonance and magnetic susceptibility. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.156401
DOI:
10.1103/PhysRevLett.91.156401
PACS:
71.27.+a, 75.20.Hr, 76.30.–v
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