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Title: Feasibility of a metamagnetic transition in correlated systems
Authors: Acharya, Swagata
Medhi, Amal
Vidhyadhiraja, N. S.
Taraphder, A.
Keywords: Physics
scaling behavior
slave rotor
Issue Date: 2016
Publisher: IoP Publishing Ltd
Citation: Acharya, S.; Medhi, A.; Vidhyadhiraja, N. S.; Taraphder, A., Feasibility of a metamagnetic transition in correlated systems. Journal of Physics-Condensed Matter 2016, 28 (11), 8
Journal of Physics-Condensed Matter
Abstract: 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.
Description: Restricted Access
ISSN: 0953-8984
Appears in Collections:Research Articles (Vidhyadhiraja N. S.)

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