Why could Electron Spin Resonance be observed in a heavy fermion Kondo lattice?

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 cancelation 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.

5pages, 1 Figure

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• Locally critical quantum phase transitions in strongly correlated metals
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• ESR of YbRh2Si2 and 174YbRh2Si2 : local and itinerant properties

Cited by in corpus (14)

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• Microwave spectroscopy on heavy-fermion systems: probing the dynamics of charges and magnetic moments
• Kondo-lattice ferromagnets and their peculiar order along the magnetically hard axis
• Electron Spin Resonance of the Yb 4f moment in Yb(Rh1-xCox)2Si2
• Anisotropic electron spin resonance of YbIr2Si2
• Theory of the Electron Spin Resonance in the Heavy Fermion Metal β-YbAlB4
• Fermi-Surface Selective Determination of the $\mathbf{g}$-Factor Anisotropy in URu${}_2$Si${}_2$
• Low temperature properties of the Electron Spin Resonance in YbRh2Si2
• Crystal electric field parameters for Yb3+ ion in YbRh2Si2
• Electron Spin Resonance of the ferromagnetic Kondo lattice CeRuPO
• Electron Spin Resonance of the itinerant ferromagnets LaCrGe3, CeCrGe3 and PrCrGe3
• Effect of pressure on the Electron Spin Resonance of a Heavy-Fermion metal
• Spin relaxation in Kondo lattices
• Angle-dependent electron spin resonance of YbRh${}_2$Si${}_2$ measured with planar microwave resonators and in-situ rotation