2014/11/30 by Swagata Acharya, Amal Medhi, N. S. Vidhyadhiraja +3
Physics and Astronomy · #Coherence (philosophical gambling strategy) #Heisenberg model #Hubbard model #Magnetic field #Magnetization #Metamagnetism #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Rare-earth and actinide compounds #Scaling #Spin (aerodynamics) #Zeeman effect #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/28/11/116001
published as Journal of Physics: Condensed Matter, Volume 28, Number 11, 19 February 2016 · arxiv version has 8 pages and 7 figures
openalex publication_date 2016/02/19 · arxiv created 2016/02/28 · arxiv updated 2016/03/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The long-standing issue of the competition between the magnetic field and the Kondo effect, favoring, respectively, triplet and singlet ground states, is addressed using a cluster slave-rotor mean-field theory for the Hubbard model and its spin-correlated, spin-frustrated extensions in two dimensions. The metamagnetic jump is established and compared with earlier results of dynamical mean-field theory. This approach also reproduces the emergent super-exchange energy scale in the insulating side. A scaling is found for the critical Zeeman field in terms of the intrinsic coherence scale just below the metal-insulator transition, where the critical spin fluctuations are soft. The conditions required for metamagnetism to appear at a reasonable field are also underlined. Gutzwiller analysis on the two-dimensional Hubbard model and a quantum Monte Carlo calculation on the Heisenberg spin system are performed to check the limiting cases of the cluster slave-rotor results for the Hubbard model. Low-field scaling features for magnetization are discussed.