Soft x-ray emission spectra of nickel-copper alloys

Clift, J.; Curry, C.J.; Thompson, Brian J.

doi:10.1080/14786436308211158

Cited by 53 publications

(6 citation statements)

References 21 publications

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“…1 There are mainly two quite distinct approaches to this problem: The first is the rigidband model which makes no distinction between the different constituents of the alloy and attributes a common band to all electrons. The second is the virtual-bound-state model (preferred for dilute impurities) which assumes screening of the host electrons at the site of the impurity.…”

mentioning

confidence: 99%

Density of States in CuNi Alloys

Hüfner¹,

Wertheim²,

Cohen³

et al. 1972

Phys. Rev. Lett.

116

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PHYSICAL REVIEW LETTERS 21 FEBRUARY 1972 7 D. W. Ross, unpublished calculation (cf. Ref. 3, Appendix C). The important point is that the resonant contribution to the growth or damping rate contains the average along a field line of $ cos(moJ b Idl/v H) which is small because of the oscillating cosine factor.The nature of the electronic state of transition metals and alloys remains a subject of discussion. 1 There are mainly two quite distinct approaches to this problem: The first is the rigidband model which makes no distinction between the different constituents of the alloy and attributes a common band to all electrons. The second is the virtual-bound-state model (preferred for dilute impurities) which assumes screening of the host electrons at the site of the impurity. Neither of these two limiting models can fully describe the actual situation. Though many experimental facts favor the virtual-bound-state model, its application is difficult in the case of concentrated alloys, especially when the magnetic electrons have much itinerant character as, for example, in CuNi alloys. 2 Soven 3 and Velicky, Kirkpatrick, and Ehrenreich 4 have therefore used the coherent-potential approximation (CPA) to describe the electronic properties of binary alloys. The results of these calculations are very promising, and invite comparison with experimental results.The CuNi system may be regarded as one of the test cases for theoretical descriptions of magnetic alloys. 5 This system had long been considered the prototype alloy whose magnetic properties are explained by the rigid-band model. Yet simple theoretical considerations 6 * 7 and much recent experimental evidence 5 ' 8 " 12 show the inadequacy of that model for the CuNi system. Ehrenreich and co-workers 4 ' 6t 7 * 13 find that an approach based on the CPA (which they call the minimum polarity model) does indeed account much more satisfactorily for the experimental observations. Recently Stocks, Williams, and Faulkner 14 have re-examined the CuNi problem using the CPA, Here, m is the closest integer to lq(r). The mode is not assumed to be of the form e im ® but instead slowly varying along the field line at each radius. 9 R. Z. Sagdeev and A. A. Galeev, Dokl. Akad. Nauk SSSR 180, 839 (1968) [Sov. Phys. Dokl. 13, 562 (1968)].following the work of Kirkpatrick, Velicky, and Ehrenreich. 13 We report here x-ray photoemission spectroscopy (XPS) data for the density of states of NiCu alloys and compare them with the theoretical predictions and with other measurements. These include (1) the specific-heat measurements of Gupta, Cheng, and Beck, 8 which strongly favor a CPA description; (2) the very extensive uv-photoemission data of Seib and Spicer 9 ' 10 which were originally interpreted in terms of the virtual-bound-state model, but can indeed be very well interpreted 13 ' 14 in the CPA; and (3) the extensive x-ray-emission investigation of Clift, Curry, and Thompson, u who found that the sharing of electrons between Cu and Ni is small but were unable to determine the form ...

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mentioning

confidence: 99%

Density of States in CuNi Alloys

Hüfner¹,

Wertheim²,

Cohen³

et al. 1972

Phys. Rev. Lett.

116

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“…Among the many measurements of the &I2,, emission band of copper that have been reported, those of Skinner et al (1954( ), Fisher et al (1958, Bedo and Tomboulian (1959), Catterall and Trotter (1962) and Clift et al (1963) appear to be in good agreement. I n figure 6 the values of I(E)/v2 tabulated by Bedo and Tomboulian are plotted.…”

Section: Comparison With Observed Spectramentioning

confidence: 69%

Influence of the temperature of a gas stream on a high-voltage diffuse discharge

Pashkin¹,

Peretyatko²

1978

Sov. J. Quantum Electron.

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T h e L and hI x-ray emission bands of metallic copper are calculated in the one-electron approximation using augmented plane wave Bloch functions analysed into s, p and d symmetry components. T h e effect on the calculated intensity distributions of lifetime broadening due to Auger processes is estimated in a simple manner, and appropriately broadened curves are compared with the available experimental data.

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“…Although, no experiment seems to have given relevant information on the empty part of the d-band there is much experimental evidence that the rigidband model [6] is inadequate to describe the density of states of the filled states. Measurements of soft X-ray emission by Clift et al [7], uv photoemission by Seib and Spicer [S, 91 and X-ray photoemission by Huffner et al…”

Section: Introductionmentioning

confidence: 99%

Soft X‐Ray Absorption in CuNi Alloys

Gudat

Kunz

1972

Physica Status Solidi (b)

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Cu-Ni alloy films have been investigated in the vicinity of the onset of 3p electron absorption in the photon energy range 50 to 90 eV. The spectra obtained can be described as a stoichiometric superposition of the individual Cu and Ni metal spectra. Any rearrangement of the states due to an alloy interaction is of no great influence. This result is in general agreement with results on soft X-ray emission, uv and X-ray photoelectric emission. It is in contradiction to the rigid band model and supports more recent alloy theories such as the coherent-potential approximation. This result, moreover, supports the interpretation of the wide structures in the transition metal spectra as a predominantly atomic effect.Dunne Schichten einer Cu-Ni-Legierung wurden in der Umgebung der Absorption der 3p-Elektronen im Photonenenergiebereich 50 bis 90 eV untersucht. Die Spektren konnen als stochiometrische Superposition der Spektren von Cu und Ni beschrieben werden. Veranderungen der ZustLnde durch die Legierungsbildung sind ohne merklichen EinfluB. Dieses Ergebnis zeigt die gleiche Tendenz wie Rontgenemissionsmessungen im weichen Rontgengebiet und Photoelektronenuntersuchungen im UV-und Rontgengebiet. Es steht im Widerspruch zum ,,rigid-band-model" und unterstiitzt neuere Theorien wie die ,,coherentpotential approximation". Dariiber hinaus spricht dieses Ergebnis fur eine atomare Deutung der breiten Maxima in den Spektren der ubergangsmetalle.

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Soft x-ray emission spectra of nickel-copper alloys

Cited by 53 publications

References 21 publications

Density of States in CuNi Alloys

Density of States in CuNi Alloys

Influence of the temperature of a gas stream on a high-voltage diffuse discharge

Soft X‐Ray Absorption in CuNi Alloys

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