The Fermi surface of [Formula: see text]

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Chemistry

Background:

• Heavy-fermion compounds exhibit unique electronic properties due to localized f electrons interacting with conduction electrons.
• Understanding the electronic structure of these materials is crucial for predicting and controlling their magnetic and transport behaviors.

Purpose of the Study:

• To investigate the electronic structure and Fermi surface of the heavy-fermion compound YbRh2Si2.
• To compare theoretical calculations with experimental data, including de Haas-van Alphen frequencies and electron-positron annihilation radiation measurements.
• To provide a new interpretation of existing experimental results.

Main Methods:

• Utilized the fully relativistic spin-polarized mean muffin-tin orbital (SP-MMTO) method.
• Employed the local density approximation (LDA) for electronic structure calculations.
• Performed two distinct calculations, treating the f electron as a valence electron and as a core electron.

Main Results:

• Obtained the Fermi surface for YbRh2Si2 under different theoretical assumptions.
• Calculated angular-dependent de Haas-van Alphen (dHvA) frequencies and compared them with experimental values.
• Computed electron momentum densities and compared them with experimental data from 2D angular correlation of electron-positron annihilation radiation (ACAR).

Conclusions:

• The study provides valuable insights into the electronic structure of YbRh2Si2.
• The theoretical calculations offer a basis for reinterpreting experimental dHvA and ACAR data.
• This work contributes to a deeper understanding of heavy-fermion system physics.