Origin of magnetic circular dichroism in soft x-ray fluorescence of Heusler alloys at threshold excitation

Yablonskikh, M. V.; Yarmoshenko, Yu. M.; Гребенников, В. И.; Kurmaev, E.Z.; Butorin, Sergei M.; Duda, Laurent; Nordgren, Joseph; Plogmann, S.; Neumann, M.

doi:10.1103/physrevb.63.235117

Cited by 53 publications

(46 citation statements)

References 31 publications

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“…V arious spectroscopy techniques such as x-ray absorption, x-ray emission, an d p h o to electro n spectroscopies (xas, xes, and xps) give an im p o rta n t inform ation a b o u t th e electronic stru c tu re of th e H M F and related com pounds, such as ferrom agnetic sem iconductors and colossal m agnetore sistance m aterials (see, e.g., Refs. [51,52,53,54]). It is well know n th a t the m an y -b o d y effects, p a rtic u larly dynam ical core hole screening, m ay be im p o rta n t for a core level spectroscopy even in th e case th a t a system is not stro n g ly co rrelated in th e in itial s ta te [55,56].…”

Section: F Irst-p Rin Cip Le C a Lcu La Tio N S O F N O N Q U A Sip Amentioning

confidence: 99%

“…H ere we shall tre a t this problem q u a n titativ ely and estim ate explicitly th e corresponding enhancem ent factor. T he in ten sity of resonant x -ray em ission induced by th e ph o to n w ith th e energy w and polarization q is given by th e K ram ers-H eisenberg form ula [63,52,64] here q', u' are th e p o larization and energy of th e em itted photon, |n), |0) and |Z) are th e final, in itial an d in term ed iate sta te s of th e scatterin g system w ith th e energies Ei, respectively, an d C q is th e o p e ra to r of a dipole m om ent for th e tra n sitio n , which is p ro p o rtio n al to (fc + c f t). For sim plicity we assum e h ereafter th a t r l does n o t depend on th e in term ed iate state: r l = r , and tak e in to account only th e m ain x -ray scatterin g channel where th e hole is filled by conduction electron.…”

Section: F Irst-p Rin Cip Le C a Lcu La Tio N S O F N O N Q U A Sip Amentioning

confidence: 99%

“…Close to the Fermi level the NQP contribution follows the power law (6). Therefore, the im purity contribution to the resistivity is equal to Ôpim^T ) = -ô a im p( T ) oc -V 2 j d E ) S N incoh(E ) oc T 3/2 (52) The contribution of the order of T a with a ^ 1.65 (which is not too far from 3/2) has been observed recently in the tem perature dependence of the resistivity for NiMnSb [67].…”

Section: T Ran Sp Ort P Ro P Ertiesmentioning

confidence: 99%

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Non-quasiparticle effects in half-metallic ferromagnets

Irkhin

Katsnelson

Lichtenstein

2007

J. Phys.: Condens. Matter

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The unusual electronic structure of the half-metallic ferromagnets (HMF) is analysed taking account of correlation effects (electron–magnon interaction, in particular spin-polaron effects). Special attention is paid to the so-called non-quasiparticle (NQP) (incoherent) states which arise in the minority- (majority-) spin gap above (below) the Fermi level and which may make considerable contributions to the electronic properties. First-principles calculations of the NQP states in HMF within the local-density approximation plus dynamical mean field theory (LDA+DMFT) are reviewed. These states can be probed, in particular, by spin-polarized scanning tunnelling microscopy. They also lead to observable effects in core–hole spectroscopy, nuclear magnetic relaxation and contribute to the temperature dependence of impurity resistivity, etc. The peculiarities of the transport properties of three- and two-dimensional HMF are discussed, which are connected with the absence of one-magnon spin-flip scattering processes.

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Section: F Irst-p Rin Cip Le C a Lcu La Tio N S O F N O N Q U A Sip Amentioning

confidence: 99%

Section: F Irst-p Rin Cip Le C a Lcu La Tio N S O F N O N Q U A Sip Amentioning

confidence: 99%

Section: T Ran Sp Ort P Ro P Ertiesmentioning

confidence: 99%

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Non-quasiparticle effects in half-metallic ferromagnets

Irkhin

Katsnelson

Lichtenstein

2007

J. Phys.: Condens. Matter

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“…Ferromagnetic properties of various Heusler compounds have been investigated experimentally [11][12][13][14][15][16] and theoretically [9,17] (see Refs. [18,19] for comprehensive review).…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and spectroscopy of the quaternary Heusler alloy Co₂Cr_1−xFe_xAl

Wurmehl

Fecher

Kroth

et al. 2006

J. Phys. D: Appl. Phys.

139

105

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Quaternary Heusler alloys Co2Cr1−xFexAl with varying Cr to Fe ratio x were investigated experimentally and theoretically. The electronic structure and spectroscopic properties were calculated using the full relativistic Korringa–Kohn–Rostocker method with coherent potential approximation to account for the random distribution of Cr and Fe atoms as well as random disorder. Magnetic effects are included using spin dependent potentials in the local spin density approximation.Magnetic circular dichroism in x-ray absorption was measured at the L2,3 edges of Co, Fe and Cr of the pure compounds and the x = 0.4 alloy in order to determine element specific magnetic moments. Calculations and measurements show an increase of the magnetic moments with increasing iron content. Resonant (560–800 eV) soft x-ray as well as high resolution–high energy (⩾3.5 keV) hard x-ray photo emission was used to probe the density of the occupied states in Co2Cr0.6Fe0.4Al.

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“…Figure 4 shows the nonresonant spin-polarized Mn L 2,3 x-ray emission spectra of Ni 75 Experimental studies of magnetic dichroism in x-ray emission spectra of magnetic materials based on 3d transition metals were reviewed by Duda [18]. Note also recent studies by Yablonskikh et al [19,20] and Kotani [21]. …”

Section: Introductionmentioning

confidence: 95%

X-ray Fluorescence Spectroscopy of Novel Materials

Kurmaev

2005

Inorg Mater

Self Cite

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This review focuses on the capabilities and potential of soft x-ray fluorescence spectroscopy for the study of the electronic structure and chemical bonding of novel materials. The basic principle of x-ray fluorescence measurements using synchrotron radiation and the corresponding instrumentation issues are outlined. Particular attention is given to x-ray spectroscopic studies of the electronic structure and characterization of nanostructures, thin films, interfaces, adsorbates, half-metallic ferromagnets, and impurities in alloys, superconductors, and semiconductors and the chemical bonding in biomaterials and liquids.

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Origin of magnetic circular dichroism in soft x-ray fluorescence of Heusler alloys at threshold excitation

Cited by 53 publications

References 31 publications

Non-quasiparticle effects in half-metallic ferromagnets

Non-quasiparticle effects in half-metallic ferromagnets

Electronic structure and spectroscopy of the quaternary Heusler alloy Co₂Cr_1−xFe_xAl

X-ray Fluorescence Spectroscopy of Novel Materials

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Origin of magnetic circular dichroism in soft x-ray fluorescence of Heusler alloys at threshold excitation

Cited by 53 publications

References 31 publications

Non-quasiparticle effects in half-metallic ferromagnets

Non-quasiparticle effects in half-metallic ferromagnets

Electronic structure and spectroscopy of the quaternary Heusler alloy Co2Cr1−xFexAl

X-ray Fluorescence Spectroscopy of Novel Materials

Contact Info

Product

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Electronic structure and spectroscopy of the quaternary Heusler alloy Co₂Cr_1−xFe_xAl