2011/01/01 by V. R. Shaginyan, К. Г. Попов, K. G. Popov +4
Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Critical field #Electron #Fermi liquid theory #Fermion #Iron-based superconductors research #Magnetic field #Magnetization #Metamagnetism #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum critical point #Quantum mechanics #Quantum phase transition #Quasiparticle #Rare-earth and actinide compounds #Strongly correlated material #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1209/0295-5075/93/17008
published as EPL 93 (2011) 17008 · 6 pages, 7 figures
openalex publication_date 2011/01/01 · arxiv created 2011/02/02 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We perform a comprehensive theoretical analysis of the high-magnetic-field behavior of the heavy-fermion (HF) compound YbRh 2 Si 2 . At low magnetic fields B , YbRh 2 Si 2 has a quantum critical point related to the suppression of antiferromagnetic ordering at a critical magnetic field B ⊥ c of B = B c 0 ≃0.06 T. Our calculations of the thermodynamic properties of YbRh 2 Si 2 in wide magnetic field range from B c 0 ≃0.06 T to B ≃18 T allow us to straddle a possible metamagnetic transition region and probe the properties of both low-field HF liquid and high-field fully polarized one. Namely, high magnetic fields B ∼ B * ∼10 T fully polarize the corresponding quasiparticle band generating a Landau-Fermi-liquid (LFL) state and suppressing the HF (actually NFL) one, while at increasing temperatures both the HF state and the corresponding NFL properties are restored. Our calculations are in good agreement with experimental facts and show that the fermion condensation quantum phase transition is indeed responsible for the observed NFL behavior and quasiparticles survive both high temperatures and high magnetic fields.