Low temperature properties of the Electron Spin Resonance in YbRh2Si2
J. Sichelschmidt, T. Kambe, I. Fazlishanov, D. Zakharov, H.-A. Krug, von Nidda, J. Wykhoff, A. Skvortsova, S. Belov, A. Kutuzov, B.I. Kochelaev,, V. Pashchenko, M. Lang, C. Krellner, C. Geibel, F. Steglich
TL;DR
This paper investigates the low-temperature electron spin resonance in YbRh2Si2, revealing how ESR parameters relate to heavy electron properties and exhibit anomalies near the heavy Fermi liquid regime.
Contribution
It provides new insights into the field and temperature dependence of ESR in YbRh2Si2, linking ESR parameters to heavy electron quasiparticle characteristics.
Findings
ESR g factor shows Kondo-like evolution
Crossover anomalies near heavy Fermi liquid regime
ESR parameters relate to quasiparticle mass and cross section
Abstract
We present the field and temperature behavior of the narrow Electron Spin Resonance (ESR) response in YbRh2Si2 well below the single ion Kondo temperature. The ESR g factor reflects a Kondo-like field and temperature evolution of the Yb3+ magnetism. Measurements towards low temperatures (>0.5K) have shown distinct crossover anomalies of the ESR parameters upon approaching the regime of a well defined heavy Fermi liquid. Comparison with the field dependence of specific heat and electrical resistivity reveal that the ESR parameters can be related to quasiparticle mass and cross section and, hence, contain inherent heavy electron properties.
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