1993
DOI: 10.1088/0953-8984/5/46/014
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On the microscopic model of Fe and Ni: the possible breakdown of the ferromagnetic fermi-liquid picture

Abstract: A new model of strong itinerant ferromagnetism, M n g into account the presence of a narrow density-of-states peak at EF. which is due lo merging of van Hove singularitis, is proposed. The states of the peak (e,-type stales for Fe) are treated within the framework of the Hubbard model with suong correlations. The role of lhe non-quasi-particle slates, which lie near EF and are not described by the theory of the ferromagnetic Fermi liquid, is investigated. In particular. experimentd data on the spin polarizatio… Show more

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Cited by 38 publications
(16 citation statements)
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References 41 publications
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“…Thus, the opening of a soft gap observed here has an origin different from the electron-electron Coulomb repulsion observed in other systems [17]. The exponent of 3/2 in SDOS suggests strong influence of electron-magnon coupling on the electronic structure [18] presumably responsible for the ferromanetic ground state.…”
contrasting
confidence: 50%
“…Thus, the opening of a soft gap observed here has an origin different from the electron-electron Coulomb repulsion observed in other systems [17]. The exponent of 3/2 in SDOS suggests strong influence of electron-magnon coupling on the electronic structure [18] presumably responsible for the ferromanetic ground state.…”
contrasting
confidence: 50%
“…The decay leading to a t ↑ 2g final hole with m v = ±1 (d xz ,d yz ) gives the strongest contribution, making a distinction between different orbitals in the DOS around the absorber ion. Indeed, considering the localized na-ture of the recombination, such DOS unravels the orbital character of the decaying states better than the DOS of the whole cluster, revealing narrow and prounounced peaks from different orbitals of the two irreducible representations in the spin up main peak, reminding of Van Hove singularities in the extended electronic structure 67,68 . Angular momentum conservation rules then dictate a Y ↓ 33 emitted wave, with strong intensity reduction along the quantization axis, similarly to the one expected in direct photoemission from a dshell (Clebsch-Gordan coefficients indeed give the highest probablity for a final m = ±3 state generated by photon absorption at the m v = ±2 states) and in line with previous reports on aligned f ±3 emitted waves for different compounds 32 .…”
Section: Resultsmentioning
confidence: 99%
“…Another important aspect is the interplay between the local Coulomb interaction, characterized by large J H , and crystal-field splitting of Fe 3d states. This interplay is particularly striking in the bcc α phase, where the partial e g density-of-states (DOS) features a large peak pinned at the Fermi level due to a van Hove singularity [25,26]. Correspondingly, this high DOS at the Fermi level in nonmagnetic α-Fe explains its tendency towards the ferromagnetism in accordance with the Stoner criterion.…”
Section: Introductionmentioning
confidence: 87%