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Localized f Electron Aspect in Heavy-Fermion Intermetallic YbRh₂Si₂

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Radwanski R., Nalecz D., Fedyk S., Ropka Z.

Acta Physica Polonica A

2018

vol. 133

issue 3

387-390

We point out that there is more and more experiments showing the almost perfect localization of thirteen f-electrons in the canonical heavy-fermion system: YbRh₂Si₂. The revealing of the Yb³⁺ crystal-field (CEF) states confirms the Quantum Atomistic Solid State Theory. QUASST was the only theory, which has claimed from 1992 the existence of the discrete CEF electronic structure and the Kramers doublet ground state in heavy-fermion intermetallics. The removal of the on-site Kramers degeneracy via spin-dependent interactions is origin of the large specific heat at low temperatures (a hallmark of the heavy-fermion phenomena) and of low-energy neutral spin-like excitations. The Kondo resonance is related to the slight splitting of the Kramers doublet ground state of the Yb³⁺ ion.

Cases of coat colour anomalies in the common shrew, Sorex araneus L

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Chetnicki W., Fedyk S., Bajkowska U.

Coat colour anomalies in the common shrew, Sorex araneus L., in the geographical range of this species, including Poland, are extremely rare. This study describes atypically coloured common shrews. Light colouration of the coat is a result of lack of pigment in the entire hair or hair fragments. It appears that atypically coloured shrews occur more often in isolated populations whose gene transfer with neighboring populations is limited.

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1 Acta Physica Polonica A

1 Folia Biologica

1 2018

1 2007

2 Fedyk S.

1 Bajkowska U.

1 Chetnicki W.

1 Nalecz D.

1 Radwanski R.

1 Ropka Z.

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Localized f Electron Aspect in Heavy-Fermion Intermetallic YbRh₂Si₂

Cases of coat colour anomalies in the common shrew, Sorex araneus L