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  • 1
    Electronic Resource
    Electronic Resource
    Pseudostructural disorder in metallic solid solutions: A study of Ag−Cd and Ag−Mg random alloys (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1431-1441 
    Details
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have investigated some Ag−Cd and Ag−Mg alloys within the KKR-CPA framework in order to give insights on their electronic properties. Notwithstanding Cd and Mg have different electronic configurations it appears that their effect on the pure Ag is quite the same. In fact measurements on their optical properties and Fermi surface indicate that most of the spectra and Fermi surface parameters are comparable. In the meantime it also appears that they cannot be classified as rigid band alloys. From the results we obtain it is possible to give sensible explanations to this peculiar behaviour in terms of the angularmomentum channels of the coherent scattering amplitude obtained within the KKR-CPA theory, the main conclusion being thats- andp-like states remain essentially free-electron-like, whiled-like states are very much perturbed by the alloying.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02452110
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  • 2
    Electronic Resource
    Electronic Resource
    Relativistic korringa-kohn-rostoker CPA theory: Extension tol=3 scattering channel (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1453-1463 
    Details
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have extended the well-known relativistic KKR-CPA theory up tol≤3 angular momentum, in order to make this framework suitable to deal with rare-earth alloys. However, such an extension has also relevance in judging the convergence of the KKR-CPA calculations even for those atomic species with empty valencef-states. To do that we worked out the transformation from the usual real spherical harmonics to the cubic double-point group representatin. We have tested the present theory and corresponding codes by computing the electronic structure of Cu0.75−Au0.25 and by comparing our results with earlierl≤2 R-KKR-CPA calculations. In order to reduce the large amount of computing time required, we have also used a new technique for the Brillouin zone integration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02452112
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of the Coulomb correlation in partially filledd-bands on the electronic spectra of disordered alloys (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 853-873 
    Details
    ISSN: 0392-6737
    Keywords: Other topics in electron states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Usando densità degli stati elettronici, calcolate mediante CPA, e una teoria che tiene conto degli effetti della correlazione coulombiana in banded non completamente piene, sono stati calcolati gli spettri Auger XVV e lo spettro a una particella rinormalizzato per le leghe disordinate Cu−Ni, Zr−Nb, Nb−Mo e Ta−W, in funzione della repulsione coulombiana.
    Notes: Summary The XVV Auger spectra of Cu−Ni, Zr−Nb, Nb−Mo and Ta−W alloys at different concentrations have been computed by using CPA densities of states and a theory which takes into account the effect of the Coulomb correlation between the two Auger holes in partially filledd-bands. The renormalized one-particle spectra and the Auger spectra are presented as a function of the Coulomb repulsion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453224
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  • 4
    Electronic Resource
    Electronic Resource
    Electronic properties of nonhomovalent alloys: A study of the b.c.c. Li−Mg solid solution (1987)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 1495-1513 
    Details
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono state studiate varie proprietà elettroniche delle leghe di Li−Mg nell’intervallo di concentrazione in cui questi sistemi cristallizzano nel reticolo b.c.c. In particolare sono state calcolate la struttura a bande, le superfici di Fermi, la resistività residua, gli spettri X ed Auger e si sono confrontati i risultati con i dati sperimentali esistenti. Il buon accordo fra risultati teorici e dati sperimentali indica che, anche per leghe di metalli semplici, gli approcci perturbativi a basso ordine possono essere insufficienti a descrivere il comportamento di tali sistemi.
    Abstract: Резюме В рамках KKR-CPA исследуется влияние процесса сплавления на электронные свойства объемноцетририованного кубического твердого раствора Li−Mg. Проводятся вычисления зонной структуры, поверхности Ферми, спектров мягкого рентгеновского излучения, остаточного сопротивления и Ож-ye-спектров для выбранных величин состава. Полученные теоретические величины хорошо согласуются с существуюими экспериментальными данными.
    Notes: Summary The influence of the alloying on the electronic properties of the b.c.c. Li−Mg solid solution has been investigated within the KKR-CPA framework. Such an influence has been studied by computing the band structure, Fermi surface, soft X-ray spectra, residual resistivity and Auger spectra for chosen values of the composition. The theoretical results we obtained are in fair agreement with the surface existing experimental data and support the view that also in «simple metals» alloys care has to be taken in studying such systems in terms of low-order perturbation approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451130
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  • 5
    Electronic Resource
    Electronic Resource
    Cluster calculations of the electronic density of states in a Cu−Zr metallic glass (1982)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 186-194 
    Details
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto La densità di stati elettronici nel vetro Cu−Zr è stata calcolata mediando le densità di stati di piú cluster di atomi. Le posizioni degli atomi nei cluster sono state scelte in modo da riprodurre la funzione di distribuzione di coppia del sistema. La densità di stati è stata calcolata per ciascun cluster con la formula di Lloyd nella teoria dello scattering multiplo. I risultati ottenuti sono in buon accordo con i dati sperimentali e mostrano un chiaro regime di split-band, con una distanza fra i due picchi principali confrontabile con i risultati sperimentali.
    Abstract: Резюме Вычисляется плотность электронных состояний в стекле Cu−Zr с помощью усреднения плотности состояний ряда кластеров атомов. Положения атомов в кластерах выбираются таким образом, чтобы воспроизвести парную функцию распределения этой системы. Для каждого кластера плотность состояний вычисляется с помощью формулы Ллойда теории многократного рассеяния. Полученные результаты довольно хорошо согласуются с экспериментальными данными. Вычисленная плотность состояний обнаруживает явный режим расщепления зоны, причем расстояние между двумя главными пиками сравнимо с экспериментальными результатами.
    Notes: Summary The electronic density of states in glassy Cu−Zr has been computed by averaging the density of states of a number of clusters of atoms. The atomic positions in the clusters were chosen in such a way to reproduce the pair distribution function of the system. For each cluster the density of states was computed within the multiple-scattering theory by using Lloyd's formula. The results obtained are in fair agreement with the experimental dta. The computed density of states shows a clear split-band regime with a distance between the two main peaks comparable with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450077
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic properties of b.c.c. transition metal solid solutions. a study of the Nr−Nb system (1982)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 351-360 
    Details
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati eseguiti calcoli di densità di stati elettronici e di spettri di assorbimento di raggi X molli nella lega Zr−Nb a varie concentrazioni, nell'àmbito dell'approssimazione di potenziale coerente nella sua versione di scattering multiplo (KKR-CPA). Si mostra che è necessaria molta attenzione per poter interpretare dati sperimentali come semplice modello a bande rigide. I risultati sono inoltre, discussi in connessione con, i dati sperimentali esistenti con i quali si riscontra un buon accordo.
    Abstract: Резюме в рамках приближения когерентного потенциала и его модификации для многократного рассеяния проводится вычисление плотностей электронных состояний и спектров поглощения мягких рентгеновских лучей в Zn−Nb сплавах. Показывается, что необходимо проявлять особое внимание при интерпретации экспериментальных данных с помощью простой модели недеформируемых зон. Полученные результаты обсуждаются в связи с имеющимися экспериментальными данными и овнаружено хорошее согласие.
    Notes: Summary Calculations of electron densities of states and of soft—X-ray absorption spectra in Zr−Nb alloys have been performed in the frame of the coherent potential approximation in its multiple-scattering version (KKR-CAP). It is shown that a lot of care is needed in applying the simple rigid-band model to these systems, in order to explain experimental data. Results are also diseussed in connection with existing experimental data and good agreement is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450932
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  • 7
    Electronic Resource
    Electronic Resource
    Electronic properties of Pt-W substitutionally random alloys (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1509-1517 
    Details
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have investigated the electronic states of some Pt-W alloys by means of the relativistic KKR-CPA theory in order to gain some insights on the many interesting physical properties of such a system. In particular we were interested in studying the role of the Fermi surface topology in the ordering phenomena shown by this alloy. It turns out that the broadening of the states at the Fermi energy makes the Fermi surface concept questionable. Reasons for that are understood in terms of our scheme and approximations, even though to give an exhaustive answer one should pursue the full-charge self-consistency obtainable in the SCF-KKR-CPA theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02452119
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  • 8
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    Conduction-band states ofTiS2studied by means of polarized x-ray absorption (1985)
    American Physical Society
    Details
    Publication Date: 1985-11-15
    Print ISSN: 0163-1829
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society
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  • 9
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    Fermi Surface Nesting in DisorderedCu1−xPdxAlloys (2001)
    American Physical Society
    Details
    Publication Date: 2001-10-31
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 10
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    Fermi surfaces and electronic topological transitions in metallic random alloys. II.AgcPd1−c (1995)
    American Physical Society
    Details
    Publication Date: 1995-11-15
    Print ISSN: 0163-1829
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society
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