Ultraviolet photoemission spectroscopic and magnetic properties of Fe1−xCoxSi single crystals

Menzel, D.; Zur, D.; Schoenes, J.

doi:10.1016/j.jmmm.2003.11.065

Cited by 12 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…% this compound becomes magnetically ordered and a metallic system. 19,20 Thus the magnetic and transport properties of these compounds are strongly correlated showing also a positive magnetoresistive effect in the ordered phase. 21 The critical temperature T C increases rapidly upon doping with Co, has its maximum value near 60 K at x = 0.35 and then decreases smoothly and diminishes to T =0 at x = 0.8.…”

Section: A Samplesmentioning

confidence: 97%

Magnetic structure ofFe1−xCoxSiin a magnetic field studied via small-angle polarized neutron diffraction

et al. 2007

View full text Add to dashboard Cite

The magnetic structure of Fe 1−x Co x Si single crystals with x = 0.10, 0.15, 0.20, 0.50 has been studied by small angle polarized neutron diffraction and superconducting quantum interference device measurements. Experiments have shown that in zero field the compounds with x = 0.1, 0.15 have a well-defined tendency to order in the one-handed spiral along ͗100͘ axes due to the anisotropic exchange, that, however, decreases with increasing Co concentration x. The magnetic structure of Fe 1−x Co x Si with x = 0.2, 0.5 consists of spiral domains with randomly oriented spiral wave vector k. The applied magnetic field produces a single domain helix oriented along the field. The process of the reorientation starts at the field H C1 . Further increase of the field leads to a magnetic phase transition from a conical to a ferromagnetic state near H C2 . In the critical range near T C the integral intensity of the Bragg reflection shows a well-pronounced minimum at H fl attributed to a k flop of the helix wave vector. On the basis of our experiments we built the H-T phase diagram for each compound. It is shown that the same set of the parameters governs the magnetic properties of these compounds k, H C1 , H fl , and H C2 . Our experimental findings are well interpreted in the framework of a recently developed theory ͓Phys. Rev. B 73, 174402 ͑2006͔͒ for cubic magnets with Dzyaloshinskii-Moriya ͑DM͒ interaction. In particular, the theory suggests an additional quantum term in the magnetic susceptibility caused by the DM interaction which is in good agreement with the experiment.

show abstract

Section: A Samplesmentioning

confidence: 97%

Magnetic structure ofFe1−xCoxSiin a magnetic field studied via small-angle polarized neutron diffraction

et al. 2007

View full text Add to dashboard Cite

show abstract

“…% Co, ferromagnetic order is observed and the sample displays a conical spin structure. 12 Above 80 at. % Fe 1−x Co x Si is paramagnetic, and finally, CoSi is a diamagnetic semimetal.…”

Section: Introductionmentioning

confidence: 98%

Electron-phonon interaction and spectral weight transfer inFe1−xCoxSi

et al. 2009

View full text Add to dashboard Cite

A comprehensive ellipsometric study was performed on Fe 1−x Co x Si single crystals in the spectral range from 0.01 to 6.2 eV. Direct and indirect band gaps of 73 and 10 meV, respectively, were observed in FeSi at 7 K. One of four infrared-active phonons that is energetically close to the direct absorption edge is coupled both to the electrons and to the low-energy phonon. This is evident from asymmetry in the phonon line shape and a reduction in its frequency when the absorption edge shifts across the phonon energy due to the temperature dependence of the direct band gap. As the temperature increases, the indirect gap changes sign, which manifests as a transition from a semiconductor to a semimetal. The corresponding gain of the spectral weight at low energies was recovered within an energy range of several eV. The present findings strongly support the model indicating that Fe 1−x Co x Si can be well described in an itinerant picture, taking into account self-energy corrections.

show abstract

“…15 The Fe 1−x Co x Si compounds remain paramagnetic for 0 Ͻ x Ͻ 0.05, while at x ͓0.05, 0.8͔, they order magnetically and become metallic. 14,16 The pure CoSi is, however, a diamagnetic semimetal. 17 Thus, the magnetic and transport properties of these compounds are strongly correlated, showing also a positive magnetoresistive effect in the ordered phase.…”

mentioning

confidence: 99%

Principal interactions in the magnetic systemFe1−xCoxSi: Magnetic structure and critical temperature by neutron diffraction and SQUID measurements

et al. 2007

View full text Add to dashboard Cite

The compound Fe 1−x Co x Si is a good representative for a cubic magnet with Dzyaloshinskii-Moriya interaction. On the basis of the neutron diffraction and superconducting quantum interference device measurements, we built the H-T phase diagram for the compound with different x from 0.1 to 0.7. The same set of parameters governs the magnetic system for different x. These parameters are well interpreted in the framework of the recently developed theory ͓S. V. Maleyev, Phys. Rev. B 73, 174402 ͑2006͔͒. As a result, the spin-wave stiffness, the Dzyaloshinskii constant, the anisotropic exchange constant, and the spin-wave gap caused by the Dzyaloshinskii interaction have been obtained and plotted as a function of x. The changes of the magnetic structure with x can be well interpreted on the basis of our findings.

show abstract

Ultraviolet photoemission spectroscopic and magnetic properties of Fe1−xCoxSi single crystals

Cited by 12 publications

References 5 publications

Magnetic structure ofFe1−xCoxSiin a magnetic field studied via small-angle polarized neutron diffraction

Magnetic structure ofFe1−xCoxSiin a magnetic field studied via small-angle polarized neutron diffraction

Electron-phonon interaction and spectral weight transfer inFe1−xCoxSi

Principal interactions in the magnetic systemFe1−xCoxSi: Magnetic structure and critical temperature by neutron diffraction and SQUID measurements

Contact Info

Product

Resources

About