Fractionalization and Fermi-surface volume in heavy-fermion compounds: the case of YbRh2Si2.

摘要: We establish an effective theory for heavy-fermion compounds close to a zero temperature antiferromagnetic (AFM) transition. Coming from the heavy Fermi liquid phase across AFM phase, electron fractionalizes into light electron, bosonic spinon, and new excitation: spinless fermionic field. Assuming this field acquires dynamics dispersion when one integrates out high energy degrees of freedom, we give scenario volume its surface through diagram. apply our special case ${\mathrm{Y}\mathrm{b}\mathrm{R}\mathrm{h}}_{2}({\mathrm{S}\mathrm{i}}_{1\ensuremath{-}x}{\mathrm{G}\mathrm{e}}_{x}{)}_{2}$ where recover, within experimental resolution, several low exponents transport thermodynamics.