Inverse Photoelectron Spectroscopy

Hüfner, S.

doi:10.1007/978-3-662-09280-4_9

Cited by 181 publications

(252 citation statements)

References 88 publications

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“…4, the in situ spin-integrated UPS and the HAXPES results fundamentally agree although the information depth of both experiments varies from 2 nm to 20 nm. This provides evidence that true surface states like Shockley or Tamm states, which are mainly located at the first atomic layer30, do not contribute to the UPS data.…”

Section: Resultsmentioning

confidence: 83%

Direct observation of half-metallicity in the Heusler compound Co2MnSi

et al. 2014

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Ferromagnetic thin films of Heusler compounds are highly relevant for spintronic applications owing to their predicted half-metallicity, that is, 100% spin polarization at the Fermi energy. However, experimental evidence for this property is scarce. Here we investigate epitaxial thin films of the compound Co2MnSi in situ by ultraviolet-photoemission spectroscopy, taking advantage of a novel multi-channel spin filter. By this surface sensitive method, an exceptionally large spin polarization of () % at room temperature is observed directly. As a more bulk sensitive method, additional ex situ spin-integrated high energy X-ray photoemission spectroscopy experiments are performed. All experimental results are compared with advanced band structure and photoemission calculations which include surface effects. Excellent agreement is obtained with calculations, which show a highly spin polarized bulk-like surface resonance ingrained in a half metallic bulk band structure.

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Section: Resultsmentioning

confidence: 83%

Direct observation of half-metallicity in the Heusler compound Co2MnSi

et al. 2014

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“…Note that the PE and IPE spectra contain information about the density of states of the occupied and unoccupied bands, respectively. Therefore, the combination of PE and IPE spectroscopies has been established as the most direct method for determining an electronic energy gap23. To avoid possible sample charging effects, we adjusted source fluxes for both ARPES and IPE experiments as shown in the insets of Fig.…”

Section: Resultsmentioning

confidence: 99%

Electronic Structure of the Kitaev Material α-RuCl3 Probed by Photoemission and Inverse Photoemission Spectroscopies

Sinn

Kim

et al. 2016

Sci Rep

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Recently, α-RuCl3 has attracted much attention as a possible material to realize the honeycomb Kitaev model of a quantum-spin-liquid state. Although the magnetic properties of α-RuCl3 have been extensively studied, its electronic structure, which is strongly related to its Kitaev physics, is poorly understood. Here, the electronic structure of α-RuCl3 was investigated by photoemission (PE) and inverse-photoemission (IPE) spectroscopies. The band gap was directly measured from the PE and IPE spectra and was found to be 1.9 eV, much larger than previously estimated values. Local density approximation (LDA) calculations showed that the on-site Coulomb interaction U could open the band gap without spin-orbit coupling (SOC). However, the SOC should also be incorporated to reproduce the proper gap size, indicating that the interplay between U and SOC plays an essential role. Several features of the PE and IPE spectra could not be explained by the results of LDA calculations. To explain such discrepancies, we performed configuration-interaction calculations for a RuCl63− cluster. The experimental data and calculations demonstrated that the 4d compound α-RuCl3 is a Jeff = 1/2 Mott insulator rather than a quasimolecular-orbital insulator. Our study also provides important physical parameters required for verifying the proposed Kitaev physics in α-RuCl3.

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“…When the incident photon energy is 600 eV, which is used in the present measurements, the electron kinetic energy originating from Ga 3d core level is 580 eV, and corresponds to about 10 Å. 12 The maximum escape depth can be assumed to be about three times (1/e 3 ϭ0.05) or 30 Å in this case. As seen in Table II, the ratio of Ga/N of the ICP-treated sample is nearly the same as that of the as-grown one above ϭ60°.…”

Section: Observation Of Inductively Coupled-plasma-induced Damage On mentioning

confidence: 99%