PHOTOELECTRON ANGULAR DISTRIBUTION PARAMETERS FOR ELEMENTS Z=55 to Z=100 IN THE PHOTOELECTRON ENERGY RANGE 100–5000 eV

Trzhaskovskaya, M. B.; Nefedov, V. I.; Yarzhemsky, V. G.

doi:10.1006/adnd.2002.0886

Cited by 201 publications

(104 citation statements)

References 8 publications

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“…No spectral O 2p valence band weight is found in the gap or at the chemical potential, thus indicating the absence of a potential gradient within the GAO film. The absence of spectral weight from interfacial Ti 3d charge carriers is due to the very small Ti 3d photoionization cross section for hard x rays [25,26].…”

Section: Resultsmentioning

confidence: 99%

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Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

et al. 2015

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Section: Resultsmentioning

confidence: 99%

“…Since the direct investigation of the interfacial 2DES by HAXPES is hindered by the small photoabsorption cross section of Ti 3d states, an indirect analysis based upon Ti 2p core levels, which exhibit a three orders of magnitude higher cross section [25,26], is the method of choice. As shown in Ref.…”

Section: Interfacial Confinement Of Charge Carriersmentioning

confidence: 99%

Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

et al. 2015

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“…One can expect to suppress the spectral weight derived mainly from s states in the spectrum measured with the spolarized light. Meanwhile, the value of σ Ir 5d 5 /σ (O 2p 6 ) 4 for the s-polarized light is smaller (∼20 at hν = 8 keV in BL19LXU) than that for the p-polarized light (∼80 at hν = 8 keV in BL19LXU and ∼90 at hν = 6 keV in P09) [28]. As can be seen in Fig.…”

mentioning

confidence: 81%

Bulk nature of layered perovskite iridates beyond the Mott scenario: An approach from a bulk-sensitive photoemission study

et al. 2014

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We present genuine bulk Ir 5d j eff states of layered perovskite iridates obtained by hard-x-ray photoemission spectroscopy (HAXPES) with s-and p-polarized lights. HAXPES spectra of Sr 2 IrO 4 and Ba 2 IrO 4 are well reproduced by the quasiparticle density of states calculated by the local density approximation with dynamical mean-field theory (LDA + DMFT). It is demonstrated that the insulating nature of the iridates is triggered by antiferromagnetic correlation (Slater type) combined with electron correlation (Mott type). The extremely-lowenergy bulk-sensitive photoemission spectroscopy reveals "bad metallic" states in the paramagnetic phase of the iridates, suggesting strongly renormalized metallic states above the Néel temperature as predicted by the LDA + DMFT. Mott physics, which explains the insulating nature in materials triggered by strong electron correlations, has been vigorously studied for several decades from both experimental and theoretical points of view [1]. Owing to these efforts, new mechanisms for the metal-insulator transition (MIT) were proposed in some "Mott" systems, for instance, orbital switching for VO 2 and the essential role of antiferromagnetic (AF) correlation effects for La 2 CuO 4 [2,3].Layered perovskite iridates A 2 IrO 4 (A = Sr, Ba) have an insulating state, the origin of which was mysterious in the early stage of the research [4]. Detailed spectroscopic and theoretical studies recently demonstrated Sr 2 IrO 4 to be a spin-orbit (SO) -driven Mott insulator [5]. According to that scenario, the electronic structure near the Fermi level (E F ) is characterized by Kramers-doublet Ir 5d j eff = 1/2 states, which are eigenstates of the SO Hamiltonian within the t 2g subspace. For the iridate with five 5d electrons, the lower j eff = 3/2 bands are fully occupied and the higher half-filled j eff = 1/2 band split into the upper and lower Hubbard bands due to the relatively weak on-site Coulomb interaction (U ). This simple picture has been widely accepted since the results of experiments, such as optical conductivity spectra, seemed to be well explained [5,6]. In addition, the results of angle-resolved ultraviolet photoemission spectroscopy were well reproduced by the local density approximation (LDA) + U + SO band structure calculations [5]. For 5d transition-metal systems, however, the nature of atom-band duality, which is a characteristic feature of heavy elements, makes the interpretation of optical conductivity spectra complicated [7]. In addition, we point out here that the photoemission spectra excited by several tens-eV photons are strongly affected by the surface electronic structures modified by stronger electron correlation effect on the surface than in the bulk even for quasi-two-dimensional compounds [8,9].Recently, the LDA study with dynamical mean-field theory (LDA + DMFT) pointed out that both Sr 2 IrO 4 and Ba 2 IrO 4 should be classified as Slater insulators, in which the AF correlation mainly contributed to realizing the insulating states in these materials rather ...

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“…The spectra were acquired at photon energies from 2 keV to 6 keV and, in some cases, to 9 keV; the slit width was of 0.5 mm for all the excitation photon energies. Atomic ratios of elements (I i,h ) relative to S were calculated from the intensity area of the detail spectra for each energy (A i,h ) employing photoionization cross-sections ( i,h ) tabulated in [57,58] and the ones extrapolated for the higher energies, and taking into account IMFP ( (KE) i ) calculated for FeS 2 and Fe 9 S 10 employing TPP−2M formula [38] and analyzer's transmission function (T(KE) i ) [40][41][42] using following equation…”

Section: Methodsmentioning

confidence: 99%

Hard X-ray photoelectron and X-ray absorption spectroscopy characterization of oxidized surfaces of iron sulfides

Mikhlin

Tomashevich

Vorobyev

et al. 2016

Applied Surface Science

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a b s t r a c tHard X-ray photoelectron spectroscopy (HAXPES) using an excitation energy range of 2 keV to 6 keV in combination with Fe K-and S K-edge XANES, measured simultaneously in total electron (TEY) and partial fluorescence yield (PFY) modes, have been applied to study near-surface regions of natural polycrystalline pyrite FeS 2 and pyrrhotite Fe 1−x S before and after etching treatments in an acidic ferric chloride solution. It was found that the following near-surface regions are formed owing to the preferential release of iron from oxidized metal sulfide lattices: (i) a thin, no more than 1-4 nm in depth, outer layer containing polysulfide species, (ii) a layer exhibiting less pronounced stoichiometry deviations and low, if any, concentrations of polysulfide, the composition and dimensions of which vary for pyrite and pyrrhotite and depend on the chemical treatment, and (iii) an extended almost stoichiometric underlayer yielding modified TEY XANES spectra, probably, due to a higher content of defects. We suggest that the extended layered structure should heavily affect the near-surface electronic properties, and processes involving the surface and interfacial charge transfer.

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PHOTOELECTRON ANGULAR DISTRIBUTION PARAMETERS FOR ELEMENTS Z=55 to Z=100 IN THE PHOTOELECTRON ENERGY RANGE 100–5000 eV

Cited by 201 publications

References 8 publications

Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

Bulk nature of layered perovskite iridates beyond the Mott scenario: An approach from a bulk-sensitive photoemission study

Hard X-ray photoelectron and X-ray absorption spectroscopy characterization of oxidized surfaces of iron sulfides

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