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

Cited by 33 publications

(55 citation statements)

References 21 publications

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“…The effective relaxation rate of the conduction electrons to the lattice is also greatly reduced, becoming proportional to temperature similar to the usual Korringa relaxation rate. This reduction supports the conditions for the bottleneck regime (23).…”

Section: T T →supporting

confidence: 82%

“…To consider the spin dynamics in the Kondo lattice under discussion we use the model including the kinetic energy of conduction electrons, the Zeeman energy, the Kondo interaction between Yb ions and conduction electrons, and the coupling between the Yb ions via conduction electrons (RKKY interaction) [23][24][25][26][27][28][29][30]. The physics of lowenergy spin excitations at temperatures 200 K T  can be described by the lowest Kramers doublet.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…However, the coupling between two spin systems makes the situation quite different. It is interesting to analyze a solution of the coupled equations (17) under the condition of the bottleneck regime (23), taking into account the renormalization of kinetic coefficients. The relaxation rate of the collective spin mode with a frequency close to the Kondo-ion resonance now is the following:…”

Section: T Tmentioning

confidence: 99%

“…As a result, the ESR resonance frequency contains a divergent logarithmic term even for the collective spin mode. For the corresponding effective g factor eff g ⊥ the following relation was obtained for the magnetic field perpendicular to the symmetry axis [23]:…”

Section: T T →mentioning

confidence: 99%

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Magnetic properties and spin kinetics of a heavy-fermion Kondo lattice

Kochelaev

2017

Low Temperature Physics

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A review of peculiarities of magnetic properties and spin kinetics of a heavy-fermion Kondo lattice revealed by electron spin resonance (ESR) experiments and their theoretical analysis is given. Among the issues discussed in some detail are the renormalization of spin kinetics coefficients due to the Kondo effect, formation of the collective spin modes of the Kondo ions and wide-band conduction electrons, unexpected behavior of ESR parameters as functions of temperature and magnetic fields. Special attention is focused on the possible role of the Kondo effect for the ESR signal existence at low temperatures.

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Section: T T →supporting

confidence: 82%

Section: Theoretical Modelmentioning

confidence: 99%

Section: T Tmentioning

confidence: 99%

Section: T T →mentioning

confidence: 99%

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Magnetic properties and spin kinetics of a heavy-fermion Kondo lattice

Kochelaev

2017

Low Temperature Physics

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“…Finally, for the anisotropic Kondo model with anisotropic Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, Kochelaev et al 27 investigated the relaxation of a collective spin mode assuming that the Kondo coupling has the same anisotropy as the g-factor.…”

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confidence: 99%

Theory of Electron Spin Resonance in Ferromagnetically Correlated Heavy Fermion Compounds

Schlottmann¹

2018

Preprint

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We study the electron spin resonance (ESR) line width for localized moments within the framework of the Kondo lattice model. An ESR signal for an impurity can only be observed if the Kondo temperature is sufficiently small. On the other hand, for the Kondo lattice, short-range ferromagnetic correlations (FM) between the localized spins are necessary to obtain an observable signal.The spin relaxation rate (line width) is inversely proportional to the static magnetic susceptibility.The FM enhance the susceptibility and hence reduce the line width. For most of the heavy fermion systems displaying an ESR signal the FM arise in the ab-plane from the strong lattice anisotropy.An ESR signal was observed in the cubic heavy fermion compound CeB 6 which has a Γ 8 groundquartet. The orbital content of the Γ 8 -quartet gives rise to an antiferro-quadrupolar ordered (AFQ) phase below 4 K. Single ions with a Γ 8 ground-multiplet are expected to display four transitions, however, only one has been observed. We address the effects of the interplay of AFQ and FM on the phase diagram and the ESR line width. While for anisotropic Ce and Yb compounds with ESR-signal it is difficult to distinguish if the resonance is due to localized spins or conducting heavy electron spins, an itinerant picture within the AFQ phase is necessary to explain the electron spin resonances for CeB 6 .The longitudinal magnetic susceptibility has a quasi-elastic central peak of line width 1/T 1 and inelastic peaks for the absorption/emission of excitation. The latter are measured via inelastic neutron scattering (INS) and provide insights into the magnetic order. We briefly summarize some of the INS results for CeB 6 in the context of the picture that emerged from the ESR experiments.

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Quantum critical behavior of heavy fermions: Quasiparticles in the Gaussian fluctuation regime

Wölfle

Abrahams

2011

Annalen der Physik

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Key words Heavy fermions, quantum critical point, spin fluctuations, YbRh2Si2. This article is dedicated to Dieter Vollhardt on the occasion of his 60th birthday.Landau quasiparticle (qp) theory may be extended into the non-Fermi liquid regime of metallic compounds near a quantum critical point (QCP), provided the width of the quasiparticle states is less than their energy. Sufficiently far from the QCP, when the critical fluctuations are non-interacting, their influence on the qp properties may be calculated in a controlled way. A prominent example is the 'marginal Fermi liquid,' characterized by a logarithmic variation of the specific heat coefficient and a linear variation of the resistivity with temperature. The latter is induced by the interaction of qps with three-dimensional ferromagnetic (FM) or, in a disordered system, with quasi-two-dimensional antiferromagnetic (AFM) spin fluctuations. It is argued that both types of fluctuations are present in YbRh2Si2. It is suggested that the experimentally observed crossover line at T * marks the changeover from AFM to FM fluctuations with increasing magnetic field. The non-Fermi liquid behavior found in the electron spin resonance data on YbRh2Si2 may be completely interpreted using critical quasiparticle theory.

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

Cited by 33 publications

References 21 publications

Magnetic properties and spin kinetics of a heavy-fermion Kondo lattice

Magnetic properties and spin kinetics of a heavy-fermion Kondo lattice

Theory of Electron Spin Resonance in Ferromagnetically Correlated Heavy Fermion Compounds

Quantum critical behavior of heavy fermions: Quasiparticles in the Gaussian fluctuation regime

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