The dual nature of 5 f electrons and origin of heavy fermions in U compounds
نویسندگان
چکیده
We develop a theory for the electronic excitations in UPt 3 which is based on the localization of two of the 5f electrons. The remaining f electron is delocalized and acquires a large effective mass by inducing intra-atomic excitations of the localized ones. The measured deHaas-vanAlphen frequencies of the heavy quasiparticles are explained as well as their anisotropic heavy mass. A model calculation for a small cluster reveals why only the largest of the different 5f hopping matrix elements is operative causing the electrons in other orbitals to localize.
منابع مشابه
Mean Field Description of Kondo-stabilized Spin Liquid in Kondo Lattice with Heavy Fermions
Microscopic mechanism of forming the spin liquid of neutral fermions in Kondo lattices with nearly integer valence of the f-electrons in presented. It is shown that the competition between the Kondo scattering and the indirect exchange interaction can result in stabilization of a state with separated spin and charge excitations with a Fermi-type spectrum for both of them. The origin of strong a...
متن کاملNovel effect of critical valence fluctuations in unconventional superconductivity of Ce-based heavy fermions and related compounds
For this decade, our group has developed a theory for unconventional superconductivity in Ce-based heavy fermion systems CeCu2(Ge,Si)2 which exhibits anomalous enhancement of superconducting transition temperature Tsc and non-Fermi liquid properties such as T-linear resistivity and huge enhancement of residual resistivity under pressure P~Pv where the valence of Ce ion appears to change drastic...
متن کاملEvaluation of Heavy Metal Dust Pollution and their Origin in the Atmosphere of Kuhdasht, Lorestan Province
Dust is one of the environmental hazards in arid and semi-arid regions of the world. In some areas, under the influence of human activities, dust is contaminated by heavy metals. In this study, the dust of 10 stations in the Kuhdasht region of Lorestan province in four seasons of spring, summer, autumn, and winter, as well as adjacent surface soils (a total of 40 dust samples and 10 surface soi...
متن کاملSources of contamination in rainwater by major and heavy elements in Arak, Iran
Measurements of Pb, Cu, Zn, As, Ni, Hg, and Fe heavy metals and major elements and components such as Ca, HCO3, SO4, Na, K, Mg and Cl in soluble rain fractions were performed on rainwater collected at Arak plain during the rainy seasons of 2012. Concentrations of the heavy metals in the soluble fractions decreased for Fe, Pb, Zn, Ni, Cu, As and Hg, respectively and the major elements and compon...
متن کاملخواص ساختاری و الکترونی بلور سریم حاصل از محاسباتLDA+U
In this work structural, electronic and magnetic properties of alpha and gamma phases of cerium crystal have been calculated by means of the LDA and LDA+U methods. The equilibrium volume and magnetic moment obtained from the GGA approximation in agreement with the experiment are equal to 27.64 Å3 and 0.00018 µB, respectively. This agreement shows that the 4f electrons in alpha phase are itiner...
متن کامل