Fluctuating local magnetic moments in ferromagnetic Ni observed by the spin-resolved resonant photoemission

Kakizaki, Akito; Fujii, J.; Shimada, Kenya; Kamata, Atsushi; Ono, Kanta; Park, Kang-Ho; Kinoshita, Toyohiko; Ishii, Takehiko; Fukutani, Hirohito

doi:10.1103/physrevlett.72.2781

Cited by 43 publications

(21 citation statements)

References 20 publications

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“…This is also true below T C , where the spin dependence of the spectra is more pronounced for the satellite region in nickel than for that of the quasiparticle bands near the Fermi level. This can explain the apparent discrepancies between different experimental determinations of the high-temperature magnetic splittings ͑Kisker et al., 1984;Kreutz et al, 1989;Kakizaki et al, 1994;Sinkovic et al, 1997͒ as results of probing different energy regions. Resonant photoemission experiments ͑Sinkovic et al, 1997͒ reflect the presence of local-moment polarization in the high-energy spectrum above the Curie temperature in nickel, while the low-energy ARPES investigations ͑Kreutz et al, 1989͒ results in nonmagnetic bands near the Fermi level.…”

Section: Iron and Nickelmentioning

confidence: 99%

Electronic structure calculations with dynamical mean-field theory

et al. 2006

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A review of the basic ideas and techniques of the spectral density-functional theory is presented. This method is currently used for electronic structure calculations of strongly correlated materials where the one-electron description breaks down. The method is illustrated with several examples where interactions play a dominant role: systems near metal-insulator transitions, systems near volume collapse transitions, and systems with local moments.

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Section: Iron and Nickelmentioning

confidence: 99%

Electronic structure calculations with dynamical mean-field theory

et al. 2006

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“…5-9͒ compared with those given by bandstructure calculations with the local spin-density approximation ͑LSDA͒, 10,11 and the existence of a spin-polarized 6 eV satellite. [12][13][14][15] We should also note that the electronic band structure of Ni is conveniently simple from a theoretical point of view; most of the majority-spin 3d states of Ni are occupied, and less than one hole exists in the minority-spin 3d states. Kanamori considered electron correlation effects on the ferromagnetism of Ni taking into account the multiple scattering of two particles.…”

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confidence: 99%

Energy band and spin-dependent many-body interactions in ferromagnetic Ni(110): A high-resolution angle-resolved photoemission study

et al. 2005

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High-resolution angle-resolved photoelectron spectroscopy of ferromagnetic Ni͑110͒ has been conducted to elucidate energy band and spin-dependent many-body interactions. A kink structure has been clearly observed in the energy band dispersions of the minority spin ⌺ 2↓ and ⌺ 1↓ , while it is absent in the majority spin ⌺ 1↑ band. Analyses of the self-energy indicate that the kink originates from the electron-phonon interaction. Based on a detailed study of the effective mass enhancement, we find that the electron-phonon interaction and electron correlation contribute to the spectral features near the Fermi level in different ways, depending on the identity of the energy band and the spin direction. These results provide insight into the interplay of these many-body interactions on quasiparticles near the Fermi level.

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“…In the framework of the local-band theory short-range spin order may persist even above T C although per definitionem long-range spin order is lost at the ferromagneticparamagnetic phase transition. Indeed, transverse spin fluctuations have recently been observed on Ni(110) [4]. Nowadays it is widely accepted that the question whether or not the exchange splitting collapses in itinerant ferromagnets at or above T C substantially depends on the degree of localization of the considered electron bands which has to be compared with the size of regions that exhibit shortrange spin order.…”

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Temperature-Dependent Exchange Splitting of a Surface State on a Local-Moment Magnet: Tb(0001)

et al. 1999

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We have investigated the temperature-dependent binding energies of the exchange-split Tb(0001) surface state by means of scanning tunneling spectroscopy. At T 16 K the majority and minority part of the surface state exhibit a binding energy of 2135 6 8 meV and 1430 6 15 meV, respectively. Both peak positions shift with increasing temperature and continuously decrease the exchange splitting down to 200 meV at 260 K, i.e., 30 K above the bulk Néel temperature T NB . This result is explained in terms of a decrease of helical short-range spin order with increasing temperature above T NB .

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Fluctuating local magnetic moments in ferromagnetic Ni observed by the spin-resolved resonant photoemission

Cited by 43 publications

References 20 publications

Electronic structure calculations with dynamical mean-field theory

Electronic structure calculations with dynamical mean-field theory

Energy band and spin-dependent many-body interactions in ferromagnetic Ni(110): A high-resolution angle-resolved photoemission study

Temperature-Dependent Exchange Splitting of a Surface State on a Local-Moment Magnet: Tb(0001)

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