Crystal-field ground state for the localized f state in heavy fermion metal YbRh2Si2
Abstract
We fully support the interpretation of Prof. F. Steglich, reported recently in Phys. Rev. Lett. 91 (2003)156401, that the observed below Kondo temperature, Electron Spin Resonance (ESR) in a heavy fermion metal YbRh2Si2 is associated with the Yb3+ moment, more exactly with the strongly-correlated 4f13 configuration. We derived the ground-state eigenfunction Gamma71= 0.803| 3/2>+ 0.595| 5/2> - 0.026| 1/2> - 0.008| 7/2> and crystal field parameters: B20= +14 K, B40= +60 mK, B60= -0.5 mK, B44= -2.23 K and B64= -10 mK with a small orthorhombic distortion B22= +0.23 K, that perfectly reproduce the observed ESR values of gperp= 3.561 and gpar= 0.17. These parameters also describe the observed overall temperature dependence of the paramagnetic susceptibility and predict anomalous temperature dependence of quadrupolar interactions.
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