Compton-scattering study of the electronic properties of the transition-metal alloys FeAl, CoAl, and NiAl

Manninen, S.; Honkimäki, V.; Hämäläinen, K.; Laukkanen, J.; Blaas, C.; Redinger, J.; McCarthy, J.; Suortti, P.

doi:10.1103/physrevb.53.7714

Cited by 20 publications

(12 citation statements)

References 15 publications

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“…This is the first high statistics and high resolution measurement in these materials, which are difficult candidates for such experiments given the problems related to fluorescence background from heavy atoms and low count-rates due to absorption. These problems have been overcome thanks to high energy synchrotron radiation and dedicated instrumentation at ID15B at the ESRF [9,10]. Our measurements show that the experimental momentum density is similar to that given by LDA band-structure calculations for YBa 2 Cu 3 O 7−δ .…”

supporting

confidence: 69%

Hole depletion and localization due to disorder in insulatingPrBa2Cu3O

et al. 1999

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The ͑mostly͒ insulating behavior of PrBa 2 Cu 3 O 7Ϫ␦ is still unexplained and even more interesting due to the occasional appearance of superconductivity in this material. Since YBa 2 Cu 3 O 7Ϫ␦ is nominally isostructural and always superconducting, we have measured the electron momentum density in these materials. We find that they differ in a striking way, the wave function coherence length in PrBa 2 Cu 3 O 7Ϫ␦ being strongly suppressed. We conclude that Pr on Ba-site substitution disorder is responsible for the metal-insulator transition. Preliminary efforts at growth with a method to prevent disorder yield 90 K superconducting

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supporting

confidence: 69%

Hole depletion and localization due to disorder in insulatingPrBa2Cu3O

et al. 1999

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“…The spectra were collected using a hyperpure germanium solid-state detector, with an energy resolution of ∼500 eV at 122 keV. Although this leads to a momentum resolution 2-4 times worse than that obtainable using a scanning crystal spectrometer (see for example [29]), the acquisition of data by the latter is too slow for a systematic investigation. The data for each profile were collected over ∼36 hours, giving an integrated count under the Compton profile of 1.3 × 10 8 , which resulted in 8.3 × 10 5 counts in the MCP.…”

Section: The Measurementmentioning

confidence: 99%

Spin density in ferromagnetic nickel: a magnetic Compton scattering study

Dixon

Duffy

Gardelis

et al. 1998

J. Phys.: Condens. Matter

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The magnetic Compton profiles (MCPs) measured in the [100], [110], [111] and [112] directions in single-crystal nickel with an incident photon beam of energy 224 keV are presented and discussed. The momentum resolution achieved, of 0.43 atomic units, improves on previous studies by almost a factor of two, and facilitates the interpretation of the MCPs in terms of the underlying spin-dependent momentum densities. Calculations have been performed using the linear muffin-tin orbital method, within both the local spin-density approximation (LSDA) and the generalized gradient approximation (GGA). Comparison with experiment reveals the limitations of the LSDA at low momentum, where the GGA is better able to reproduce the contribution of the s-and p-like electrons. All of the calculations overestimate the moment associated with the d-like electrons, for momenta corresponding to the first Brillouin zone. We also confirm the existence of the so-called Umklapp shoulders, which derive from the Fermi surface topology.

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“…The beam from such an extra reflection may reach the narrow but vertically extended receiving slit and contribute to detectable intensity, if the relp of the reflection lies in the vertical plane that is spanned by the nominal relp (440) and the vertical rotation axis, and thus fulfils the horizontal focusing condition at least approximately. This has been observed both for an off-focusing-plane reflection {(551) with [001] as the rotation axis} and for parasitic scattering excited by incident beam harmonics and reflected by other (hh0) of the analyser (Manninen et al, 1996;Suortti et al, 1999). Both types of unwanted irregular contributions to the measured spectrum are avoided in the present set-up by choosing the (311) reflection of the Si monochromator (overtones forbidden or very weak), and by choosing ½1 " 1 10 as the rotation axis of the analyser crystal (Suortti et al, 1999).…”

Section: Quantum Efficiency Function Of the Analysermentioning

confidence: 96%

Directional lithium hydride Compton profiles of 0.1% statistical accuracy

Huotari

Boldrini

Honkimäki

et al. 2009

J Synchrotron Radiat

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The present status and accuracy of determining the electron momentum density from experimental Compton profiles is reviewed. The new spectrometers operating at third-generation synchrotron radiation sources have made possible measurements with 0.1% statistical accuracy at the Compton peak. A comparable accuracy of the Compton profiles is achieved only after careful corrections for departures from the impulse approximation, effects of multiple scattering, and variations in the analyser response function. Detailed descriptions are given of the correction procedures applied to the data collected by the Johann-type scanning spectrometer that is one of the Compton spectrometers in use at the ESRF. Special attention is paid to the calculation and correction of the glitches that are caused by extra reflections of the analyser crystal. The Fourier transform of the Compton profile, the reciprocal form factor, is calculated, and its use in data treatment and presentation is discussed.

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Compton-scattering study of the electronic properties of the transition-metal alloys FeAl, CoAl, and NiAl

Cited by 20 publications

References 15 publications

Hole depletion and localization due to disorder in insulatingPrBa2Cu3O

Hole depletion and localization due to disorder in insulatingPrBa2Cu3O

Spin density in ferromagnetic nickel: a magnetic Compton scattering study

Directional lithium hydride Compton profiles of 0.1% statistical accuracy

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