Almost localized fermions in a magnetic field deviation from the Landau picture and a transition to non-Fermi liquid

A simple slave-boson representation combined with the Hartree-Fock approximation for the Hund's rule coupling is introduced for a doubly degenerate narrow band, which bears a direct relation to that introduced previously in the nondegenerate case. Namely, one keeps the fermion representation of the spin operator to recover properly the energy of fermionic quasiparticles in the presence of an applied magnetic field. A simple two-parameter mean-field analysis of the metamagnetism is provided, with the emphasis on the role of the Hund's rule coupling. We also analyse the appearance of the spin-split effective masses in the applied field and for nonhalf-filled-band situation. The Mott-Hubbard boundary is determined at nonzero temperature (T > 0); it shifts towards lower interactions with increasing T and the field signalling the precursory localization effects, explicitly exhibited in the behavior of the magnetic susceptibility calculated in the Appendix. We also formulate a more general two-parameter rotationally invariant approach for an arbitrary degeneracy d of equivalent orbitals and show that the Mott-Hubbard transition at zero temperature and at any integer filling n > 1 is always discontinuous. A brief overview of experimental situation is also made.

show abstract

Simple treatment of the metal-insulator transition: Effects of degeneracy, temperature, and applied magnetic field

Klejnberg

Spałek

1998

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Almost localized fermions in a magnetic field deviation from the Landau picture and a transition to non-Fermi liquid

Cited by 1 publication

References 3 publications

Simple treatment of the metal-insulator transition: Effects of degeneracy, temperature, and applied magnetic field

Simple treatment of the metal-insulator transition: Effects of degeneracy, temperature, and applied magnetic field

Contact Info

Product

Resources

About