Low Temperature Electron Spin Resonance of the Kondo Ion in a Heavy Fermion Metal: YbRh2Si2

J. Sichelschmidt, V. A. Ivanshin, J. Ferstl, C. Geibel, and F. Steglich
Phys. Rev. Lett. 91, 156401 – Published 6 October 2003

Abstract

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.

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  • Received 12 May 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.156401

©2003 American Physical Society

Authors & Affiliations

J. Sichelschmidt1, V. A. Ivanshin2, J. Ferstl1, C. Geibel1, and F. Steglich1

  • 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • 2MRS Laboratory, Kazan State University, 420008 Kazan, Russia

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Issue

Vol. 91, Iss. 15 — 10 October 2003

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