Why could electron spin resonance be observed in a heavy fermion Kondo lattice?

Kochelaev, B. I.; Belov, S. I.; Skvortsova, A. M.; Kutuzov, A. S.; Sichelschmidt, J.; Wykhoff, J.; Geibel, C.; Steglich, F.

doi:10.1140/epjb/e2009-00386-9

Solid State and Materials
Open Access
Published: 10 November 2009

Why could electron spin resonance be observed in a heavy fermion Kondo lattice?

B. I. Kochelaev¹,
S. I. Belov¹,
A. M. Skvortsova¹,
A. S. Kutuzov¹,
J. Sichelschmidt²,
J. Wykhoff²,
C. Geibel² &
…
F. Steglich²

The European Physical Journal B volume 72, pages 485–489 (2009)Cite this article

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Abstract

We develop a theoretical basis for understanding the spin relaxation processes in Kondo lattice systems with heavy fermions as experimentally observed by electron spin resonance (ESR). The Kondo effect leads to a common energy scale that regulates a logarithmic divergence of different spin kinetic coefficients and supports a collective spin motion of the Kondo ions with conduction electrons. We find that the relaxation rate of a collective spin mode is greatly reduced due to a mutual cancellation of all the divergent contributions even in the case of the strongly anisotropic Kondo interaction. The contribution to the ESR linewidth caused by the local magnetic field distribution is subject to motional narrowing supported by ferromagnetic correlations. The developed theoretical model successfully explains the ESR data of YbRh₂Si₂ in terms of their dependence on temperature and magnetic field.

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Authors and Affiliations

Theoretical Physics Departement, Kazan State University, 420008, Kazan, Russia
B. I. Kochelaev, S. I. Belov, A. M. Skvortsova & A. S. Kutuzov
Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
J. Sichelschmidt, J. Wykhoff, C. Geibel & F. Steglich

Authors

B. I. Kochelaev
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S. I. Belov
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A. M. Skvortsova
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A. S. Kutuzov
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J. Sichelschmidt
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J. Wykhoff
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C. Geibel
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F. Steglich
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Corresponding author

Correspondence to B. I. Kochelaev.

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Kochelaev, B., Belov, S., Skvortsova, A. et al. Why could electron spin resonance be observed in a heavy fermion Kondo lattice?. Eur. Phys. J. B 72, 485–489 (2009). https://doi.org/10.1140/epjb/e2009-00386-9

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Received: 16 September 2009
Revised: 15 October 2009
Published: 10 November 2009
Issue Date: December 2009
DOI: https://doi.org/10.1140/epjb/e2009-00386-9

Keywords

Electron Spin Resonance
Electron Spin Resonance Signal
Heavy Fermion
Quantum Critical Point
Kondo Lattice