Itinerant ferromagnetism of systems with double orbital degeneracy

Didukh, L.; Hankevych, V.; Kramar, Oleksandr; Skorenkyy, Yuriy

doi:10.1088/0953-8984/14/4/315

Cited by 9 publications

(5 citation statements)

References 24 publications

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“…Surprisingly similar behavior of magnetization as a function of d-band filling has been observed experimentally in the itinerant ferromagnetic systems 1xx2 FeCoS − and 1xx2CoNiS −[10]. Also similar behavior of magnetization has been seen in the theoretical work of Didukh et al[11] in their study of doubly orbitally degenerate generalized Hubbard model.…”

supporting

confidence: 77%

Role of inter-site exchange and hybrid interactions in itinerant ferromagnetism

Dua

Singh

2004

Journal of Physics and Chemistry of Solids

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We study role of inter-site hybrid interactions in deciding ferromagnetic state in the itinerant electron (narrow band) systems like some of the transition metals. We have considered Hubbard like tight binding model alongwith exchange and hybrid interactions. All interactions have been treated within mean-field approximation. It is found here that hybrid interactions play significant role at zero as well as infinite temperatures in deciding on-set of ferromagnetic state. We have studied variation of effective mass of up and down spin electrons in ferromagnetic state as a function of temperature. Also studied are magnetic susceptibility, optical conductivity and magnetoresistance as a function of temperature.Suggested PACS Numbers: 71.28.+d, 75.10.Lp,

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supporting

confidence: 77%

Role of inter-site exchange and hybrid interactions in itinerant ferromagnetism

Dua

Singh

2004

Journal of Physics and Chemistry of Solids

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“…At the same time, the majority of the results in the case of degenerated band (see for example [30][31][32][33][34][35]) are devoted only to a "standard" generalization of the degenerate Hubbard model. Besides, taking into account the correlated hopping essentially enriches the properties of the model (see [36][37][38]). …”

Section: Introductionmentioning

confidence: 99%

Metallic ferromagnetism in the systems with strongly correlated electrons

Didukh¹,

Kramar²

2005

Condens. Matter Phys.

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The present paper considers the ground state ferromagnetic ordering in narrow-band models with strongly correlated electrons, in particular, in a single-band generalized Hubbard model with correlated hopping and interatomic exchange interaction, as well as in a double orbitally degenerate Hubbard model with correlated hopping. The effective Hamiltonians of these models are treated by means of variants of generalized Hartree-Fock approximations, in which the quasi-particle energy spectra are obtained. The ground state energy, critical electron concentration and magnetization are calculated for some types of density of states. The mechanisms of ferromagnetic ordering stability in the narrow-band materials are discussed.

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“…Together with evidence from the one orbital model we can conclude that these oscillations, appearing when doping the Néel state at half filling, are indeed signs of an incommensurate spin density wave 33,34,35 . For occupations of n 1.5 the physical situation starts to become influenced by the double exchange mechanism 36,37 and we thus expect to find ferromagnetic order 38,39,40,41,42,43,44,45 . Figure 1 and 2 FIG.…”

Section: A Filling Range 1 < N ≤mentioning

confidence: 95%

Magnetic groundstates in a correlated two orbital Hubbard model

Peters,

Pruschke

2009

Preprint

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We examine the orbital and magnetic order of the two orbital Hubbard model within dynamical mean field theory. The model describes the low energy physics of a partially filled eg-band as can be found in some transition metal compounds. The model shows antiferromagnetic as well as ferromagnetic phases. For stabilizing ferromagnetism we find that Hund's coupling is particularly important. Quarter filling represents a very special situation in the phase diagram, where the coupling of spin, charge, and orbital degrees of freedom are involved. Exactly at quarter filling we find a metal insulator transition (MIT) between two almost fully polarized ferromagnetic states. This MIT can be tuned by changing the local interaction strength and seems to be a first order transition at zero temperature. Apart from these ferromagnetic states we were also able to stabilize antiferromagnetic and charge ordered phases at quarter filling, depending on the interaction parameters.

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Itinerant ferromagnetism of systems with double orbital degeneracy

Cited by 9 publications

References 24 publications

Role of inter-site exchange and hybrid interactions in itinerant ferromagnetism

Role of inter-site exchange and hybrid interactions in itinerant ferromagnetism

Metallic ferromagnetism in the systems with strongly correlated electrons

Magnetic groundstates in a correlated two orbital Hubbard model

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