The X-ray debye temperature of LaB6

Korsukova, M. M.; Lundström, Torsten; Tergenius, Lars-Erik; Гурин, В. Н.

doi:10.1016/0038-1098(87)90837-4

Cited by 13 publications

(8 citation statements)

References 15 publications

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“…(1), which is valid for emission from an isolated atom, suggests, in the first approximation, that the boron atoms can freely recoil out of the lattice during the present photoemission process. This experimental result is not in contradiction with what was calculated by Korsukova et al [71], reporting that the estimated Debye temperature of LaB 6 is of 417 K for "the more loosely bound lanthanum ions" and 732 K for the rigid boron network. In fact, if we consider that the experimental Boron recoil energy of 0.13 eV corresponds to a temperature of ≈1500 K, which is well above the predicted Debye temperature (≈800 K) of the boron lattice, we can conclude that B recoils as an approximately "free" atom.…”

Section: Recoil Effectsupporting

confidence: 65%

“…Based on the Debye temperature, as reported in [Ref. [71]], and on Eq. (3) we estimated that the DW factor for LaB 6 is about 0.6 at 3237.5 eV and at 30 K, and as a consequence, we expect to observe a clear bulk dispersive band structure.…”

Section: Valence-band Structurementioning

confidence: 99%

“…Korsukova at al. 73 considered that the two La and B sub-lattices have different Debye temperatures: the more loosely bound lanthanum ions are assigned a Debye temperature of 417 K and the rigid boron network to 732 K. This assumes relatively weak coupling between the two sub-lattices. Based on the W(T) as reported in 73 and on Eq.…”

Section: D) Valence-band Structurementioning

confidence: 99%

“…73 considered that the two La and B sub-lattices have different Debye temperatures: the more loosely bound lanthanum ions are assigned a Debye temperature of 417 K and the rigid boron network to 732 K. This assumes relatively weak coupling between the two sub-lattices. Based on the W(T) as reported in 73 and on Eq. ( 3) we estimated that the DW factor for LaB 6 is about 0.6 at 3237.5 eV and at 30 K, as a consequence, we expect to observe a clear bulk dispersive band structure.…”

Section: D) Valence-band Structurementioning

confidence: 99%

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Bulk electronic structure of lanthanum hexaboride ( LaB6 ) by hard x-ray angle-resolved photoelectron spectroscopy

Rattanachata

Nicolaï

Martins

et al. 2021

Phys. Rev. Materials

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In the last decade rare-earth hexaborides have been investigated for their fundamental importance in condensed matter, and for their applications in advanced technological fields. Among these compounds, LaB 6 has a special place, being a traditional d-band metal without additional f bands. In order to understand the bulk electronic structure of the more complex rare-earth hexaborides, in this paper we investigate the bulk electronic structure of LaB 6 using tender/hard x-ray photoemission spectroscopy, measuring both core-level and angle-resolved valence-band spectra. Furthermore, we compare the La 3d core level spectrum to cluster model calculations in order to understand the bulklike core-hole screening effects. The results show that the La 3d well-screened peak is at a lower binding energy compared to the main poorly screened peak; the relative intensity between these peaks depends on how strong the hybridization is between La and B atoms. We show that the recoil effect, negligible in the soft x-ray regime, becomes prominent at higher kinetic energies for lighter elements, such as boron, but is still negligible for heavy elements, such as lanthanum. In addition, we report the bulklike band structure of LaB 6 determined by tender/hard x-ray angle-resolved photoemission spectroscopy (HARPES). We compare HARPES experimental results to the free-electron final-state calculations and to the more precise one-step photoemission theory including matrix element and phonon excitation effects. The agreement between the features present in the experimental ARPES data and the theoretical calculations is very good. In addition, we consider the nature and the magnitude of phonon excitations in order to interpret HARPES experimental data measured at different temperatures and excitation energies. We demonstrate that the one-step theory of photoemission and HARPES experiments provides, at present, the only approach capable of probing, both experimentally and theoretically, true "bulklike" electronic band structure of rare-earth hexaborides and strongly correlated materials.

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Section: Recoil Effectsupporting

confidence: 65%

Section: Valence-band Structurementioning

confidence: 99%

Section: D) Valence-band Structurementioning

confidence: 99%

Section: D) Valence-band Structurementioning

confidence: 99%

See 2 more Smart Citations

Bulk electronic structure of lanthanum hexaboride ( LaB6 ) by hard x-ray angle-resolved photoelectron spectroscopy

Rattanachata

Nicolaï

Martins

et al. 2021

Phys. Rev. Materials

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show abstract

“…Equation 5Equation (6 Table 2 LaB 6 structural parameters with different absorption correction compared with single-crystal values (Korsukova et al, 1986(Korsukova et al, , 1987. Figure 2 dependence of the transmission factor for a specimen with = 5 cm À1 in a 0.5 mm-diameter glass capillary, comparing the effect of including absorption in the glass (Cu K radiation).…”

mentioning

confidence: 99%

Absorption correction for cylindrical and annular specimens and their containers or supports

Bowden

Ryan

2010

J Appl Crystallogr

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The absorption correction for cylindrical specimens, typically capillary or annular, is affected by absorption in both the specimen and the supporting material. These corrections are calculated here using numerical integration of the lengths through the different regions of the specimen that the beam traverses. Suitable formulae have been derived and built in to a computer program for calculating the absorption correction for a range of cylindrical geometries. The influence of absorption in the support is most significant for annular specimens on a highly absorbing core, and for capillary specimens of highly absorbing compounds. The error arising from neglecting absorption in the specimen and additionally in the capillary is demonstrated in Rietveld refinements of LaB6. Interpolation of correction factors between values calculated at discrete θ intervals, and θ offsets arising from absorption, are also discussed.

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Boron compounds with lanthanides: properties of lanthanide hexaborides: SmB6

Landolt-Börnstein - Group III Condensed Matter

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The X-ray debye temperature of LaB6

Cited by 13 publications

References 15 publications

Bulk electronic structure of lanthanum hexaboride ( LaB6 ) by hard x-ray angle-resolved photoelectron spectroscopy

Bulk electronic structure of lanthanum hexaboride ( LaB6 ) by hard x-ray angle-resolved photoelectron spectroscopy

Absorption correction for cylindrical and annular specimens and their containers or supports

Boron compounds with lanthanides: properties of lanthanide hexaborides: SmB6

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