The LIII X-ray emission edge in lanthanum hydrides

Sarma, Atul C.; Bos, William G.

doi:10.1016/s0022-3697(71)80036-7

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…15 The calculations provide a fairly consistent picture of the electronic band structure, 16 which is in satisfactory agreement with results from various electron spectroscopies. [17][18][19][20] Hydrogen-derived states were observed at some 5 eV binding energy, the density of states at the Fermi energy is reduced in the hydride as compared to the metal and dependent on composition. Obviously the hydride forms at the expense of the conduction-band population; the metal-derived 5d states appear to be depopulated in favor of the low-lying bands.…”

Section: Introductionmentioning

confidence: 99%

Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaH
Münzenberg
¹
,
Leuenberger
²
,
Felsch
³

et al. 2003
Phys. Rev. B
5
2
4
0
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Rare-earth hydrides RH x show a metal-to-insulator transition for x between 2 and 3. In an ionic picture strong Coulomb interactions between the electrons on H sites are responsible for opening up a gap of ϳ2 eV between the valence bands derived from RH and H-H hybridization and a set of bands of predominantly R-metal d character. We have studied the magnetic polarization near the interfaces of Fe/RH x multilayers (RϭLa, Ce͒ across the metal-to-insulator transition in the hydrides by measurements of x-ray magnetic circular dichroism ͑XMCD͒ at the R L 2,3 edges. The mean Fe-induced magnetic polarization of the R 5d states is considerably reduced in the insulating phase but remains finite. We attribute this to the presence of 5d states induced into the energy gap of the insulator sublayers by Fe, as they result from recent calculations of the electronic structure of ferromagnet/insulator interfaces. Variation of the RH x sublayer thickness reveals that the 5d polarization decays exponentially away from the interface, on a length scale of about 10 Å into the volume of the RH x sublayers, both in the metallic and insulating phase. To our knowledge this is the first experimental observation that metal-induced gap states evanescent into the interior of an insulator may be spin polarized. The identical decay length in both RH x phases, independent of the R element, is remarkable. The R L 2,3 XMCD spectra themselves reveal the complex interplay between the magnetic polarization by Fe 3d and R 5d hybridizations, and the R 4 f magnetic moment. In fact, they are not only related to the magnetic 5d polarization in the ground state, but are largely controlled by the exchange interaction between the 2p core level and the spin polarized 5d band and, in the case of Ce, by the difference between the radial parts of the 2p-to-5d matrix element for the 5d majority and minority spin channels, resulting from the 4 f -5d exchange interaction. It induces a drastic modification of the line shape and even a change in sign when the samples are cooled to low temperature or oriented under different angles with respect to the beam. We present a detailed discussion within a simple phenomenological model.

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Section: Introductionmentioning

confidence: 99%

Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaH
Münzenberg
¹
,
Leuenberger
²
,
Felsch
³

et al. 2003
Phys. Rev. B
5
2
4
0
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“…From earlier work 49 in the BCS framework, we expect this to be the case in the low magnetic field part of the phase diagram. The formalism in the SDA is built on the potential ∆ s s not the order parameter χ.…”

Section: Description Of the Second Order Phase Transitionmentioning

confidence: 74%

Ab initiotheory of superconductivity in a magnetic field. I. Spin density functional theory for superconductors and Eliashberg equations

et al. 2015

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We present a first-principles approach to describe magnetic and superconducting systems and the phenomena of competition between these electronic effects. We develop a density functional theory: SpinSCDFT, by extending the Hohenberg-Kohn theorem and constructing the non-interacting KohnSham system. An exchange-correlation functional for SpinSCDFT is derived from the Sham Schlüter connection between the SpinSCDFT Kohn-Sham and a self-energy in Eliashberg approximation. The reference Eliashberg equations for superconductors in the presence of magnetism are also derived and discussed.

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“…(5), a peculiar behavior is found in that the T c (J) curve bends inwards 14 . We solve the linearized Eq.…”

Section: The Bcs Theory With An Exchange Splittingmentioning

confidence: 99%

“…The J−T diagram of a BCS model with a homogeneous exchange splitting parameter J has been presented by Ref. 14. This approach, that we are going to review here, can only be used to obtain qualitative results.…”

Section: The Bcs Theory With An Exchange Splittingmentioning

confidence: 99%

Ab initiotheory of superconductivity in a magnetic field. II. Numerical solution

2015

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We numerically investigate the Spin Density Functional theory for superconductors (SpinSCDFT) and the approximated exchange-correlation functional, derived and presented in the preceding paper I. As a test system we employ a free electron gas featuring an exchange-splitting, a phononic pairing field and a Coulomb repulsion. SpinSCDFT results are compared with Sarma, the Bardeen Cooper and Schrieffer theory and with an Eliashberg type of approach. We find that the spectrum of the superconducting Kohn-Sham SpinSCDFT system is not in agreement with the true quasi particle structure. Therefore, starting from the Dyson equation, we derive a scheme that allows to compute the many body excitations of the superconductor and represents the extension to superconductivity of the G0W0 method in band structure theory. This superconducting G0W0 method vastly improves the predicted spectra.

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The LIII X-ray emission edge in lanthanum hydrides

Cited by 14 publications

References 13 publications

Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaH
Münzenberg
¹
,
Leuenberger
²
,
Felsch
³

et al. 2003
Phys. Rev. B
5
2
4
0
View full text Add to dashboard Cite

Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaH
Münzenberg
¹
,
Leuenberger
²
,
Felsch
³

et al. 2003
Phys. Rev. B
5
2
4
0
View full text Add to dashboard Cite

Ab initiotheory of superconductivity in a magnetic field. I. Spin density functional theory for superconductors and Eliashberg equations

Ab initiotheory of superconductivity in a magnetic field. II. Numerical solution

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The LIII X-ray emission edge in lanthanum hydrides

Cited by 14 publications

References 13 publications

Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaHMünzenberg1, Leuenberger2, Felsch3 et al. 2003Phys. Rev. B5240View full textAdd to dashboardCite

Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaHMünzenberg1, Leuenberger2, Felsch3 et al. 2003Phys. Rev. B5240View full textAdd to dashboardCite

Ab initiotheory of superconductivity in a magnetic field. I. Spin density functional theory for superconductors and Eliashberg equations

Ab initiotheory of superconductivity in a magnetic field. II. Numerical solution

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Product

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Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaH
Münzenberg
¹
,
Leuenberger
²
,
Felsch
³

et al. 2003
Phys. Rev. B
5
2
4
0
View full text Add to dashboard Cite

Magnetic polarization of the La and Ce5dstates near the interfaces ofFe/LaH
Münzenberg
¹
,
Leuenberger
²
,
Felsch
³

et al. 2003
Phys. Rev. B
5
2
4
0
View full text Add to dashboard Cite