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  • 1
    Electronic Resource
    Electronic Resource
    Der Einfluß struktureller Fehlstellen in polykristallinem Kupfer auf den Magnetwiderstand (1969)
    Springer
    The European physical journal 9 (1969), S. 260-263 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Zusammenfassung Der longitudinale Magnetwiderstand polykristalliner Kupferdrähte wurde bei 4,6°K untersucht in Abhängigkeit von der Art der Streuzentren. Abweichungen von der Kohlerregel treten auf bei Änderung der Streuzentrenkonfiguration (Fremdatome, Eigenzwischengitteratome und Leerstellen, Frank-Versetzungsringe). Die Ergebnisse zeigen, daß der Magnetwiderstand von der Konfiguration der Streuzentren abhängt und zur Untersuchung von Streupotentialen der Leitungselektronen verwendet werden kann.
    Abstract: Résumé La magnetoresistance longitudinale de fils de cuivre polycristallins a été mesurée à 4,6°K en fonction de la nature de différents centres diffuseurs. Des déviations de la loi de Kohler apparaissent suivant que prédominent des impuretés résiduelles, des interstitiels, des lacunes, des anneaux de dislocations de Frank. Ces résultats montrent que la magnetoresistance dépend de la nature des centres diffuseurs et qu’elle peut servir pour l’étude de leurs potentiels.
    Notes: Abstract The longitudinal magnetoresistance of polycrystalline copper wires was observed at 4,6°K after various treatments. Deviations of the Kohler rule occur when the predominant scattering centers are changed from foreign atoms to self-interstitials and vacancies and to Frank dislocation loops. The experimental results show that the magnetoresistance depends on the configuration of scattering centers and can be used to investigate the scattering potentials for conduction electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422569
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  • 2
    Electronic Resource
    Electronic Resource
    Die Kohler-Regel für den longitudinalen Magnetwiderstand von neutronenbestrahltem Kupfer bei 4,6°K (1970)
    Springer
    The European physical journal 12 (1970), S. 72-80 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Zusammenfassung Wir haben den longitudinalen Magnetwiderstand von reinem ein- und polykristallinem Kupfer nach Tieftemperaturbestrahlung mit schnellen Neutronen und anschließendem stufenweisen Tempern gemessen. Änderungen der Streuanisotropie der Defekte während Bestrahlung und Erholung machen sich in Abweichungen von der Kohler-Regel bemerkbar. Das Ergebnis der Messungen lautet, daß während der Bestrahlung und der Erholungsstufe I vorwiegend dieselbe Streukonfiguration vorhanden ist, die sich dann so verändert, daß nach Stufe III eine neue Konfiguration vorherrscht.
    Abstract: Résumé Nous avons mesuré la magnetorésistivité longitudinale de cuivre pur mono- et polycrystallin après avoir crée à basse température des défauts ponctuels par bombardement neutronique et après des récuits isochrones. Les changements des anisotropies de la diffusion des électrons par ces défauts peuvent être étudiés à partir des déviations de la loi de Kohler. Il résulte de nos mesures que durant l’irradiation et le stage I du recuit la même configuration de diffusion est présente, qu’elle se transforme ensuite et qu’après le stage III une nouvelle configuration prédomine.
    Notes: Abstract We have measured the longitudinal magnetoresistance of pure single- and polycrystalline copper after introducing structural defects at low temperature with fast neutrons and subsequent step-annealing. There are deviations from Kohler’s rule if the scattering anisotropies of the defects change. The result of the measurement is that during irradiation and recovery stage I almost the same scattering configuration is present, which rearranges to another configuration which dominates after stage III.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422905
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  • 3
    Electronic Resource
    Electronic Resource
    Superconducting transition temperature and low temperature resistivity in the niobium-hydrogen system (1977)
    Springer
    The European physical journal 27 (1977), S. 227-232 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The superconducting transition temperature and the low temperature resistivity of highpurity NbH x samples were measured up tox=1.08. In the hydride phases (x〉0.7) no transition was found above 1.3 K, whereas samples in the two-phase region 0〈x〈0.7 are superconducting withT c=9.4 K. The residual resistivity in the normal state exhibits a maximum of 1.2 µΩ cm atx~0.69. Magnetization curves belowT c exhibit large hysteresis effects. The morphology of the two-phase structure was analyzed by optical microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325532
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  • 4
    Electronic Resource
    Electronic Resource
    The low-field galvanomagnetic transport coefficients of cubic metals: General formulae and experiments on the hall coefficient in Al(Ge) (1979)
    Springer
    The European physical journal 34 (1979), S. 243-254 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The scattering of conduction electrons by defects is described by a low-field transport relaxation timeτ k x . It depends on the electron wavevectork and on the direction of the electric fieldE/E, but not on the magnetic fieldH. From a discussion of Kohler's rule written in terms of the exact relaxation timeτ k * it follows that this approximation is very good for low values ofH/ρ, withρ being the resistivity forH=0. Assumingτ k x to be known, the linearized Boltzmann equation is solved by a Jones-Zener expansion up to termsH 3. For metals with cubic symmetry we derive simple formulae for the coefficients of transverse and longitudinal magnetoresistance and for the two leading terms of the Hall coefficientR(H)=R 0+R 2(H/ρ)2. Simplifications occur for aτ k with cubic symmetry and for metals with special Fermi surfaces. These formulae are used to interpret experimental results of the magnetic field dependence ofR(H) in Al(Ge) at 4 K. In this dilute aluminium alloyR 0 is highly positive andR 2 strongly negative. By irradiating a 3,000 ppm Al(Ge) sample with reactor neutrons at 4 K, an increasing concentration of self-interstitials and vacancies is added to the germanium impurities resulting in a decrease of bothR 0 and |R 2|. This is discussed in a three-group model of the Fermi surface of aluminium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325618
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  • 5
    Electronic Resource
    Electronic Resource
    On muon localization in doped aluminium samples (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 197-201 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic field dependence of the transverseμSR linewidth has been studied in anAlAg single crystal. The muon site is found to be tetrahedral at 22 K and octahedral at 0.05 K. Both the site change and the magnitudes of the electric field gradients are similar to previous observations onAlMn, although these two impurities create different strain fields in Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065902
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  • 6
    Electronic Resource
    Electronic Resource
    Mobility of muons in Cu below 2 K (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 117-124 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have performed transverse fieldμSR experiments on several different samples of copper in the temperature range below 2 K, including isotope separated Cu and impurity doped polycrystalline Cu. We do not observe any strong effect of the isotope composition of the sample. A63Cu and a natural Cu sample of identical purity both yield 0.16μs−1 for the low-temperature plateau, while an increased linewidth in the65Cu case may be related to the strong effects of Fe impurities. Careful transverse field measurements on large single crystals at 0.08 K reveal non-Gaussian lineshapes in accordance with the picture of diffusing muons at this temperature. This allows us to reject several of the existing models for muon behaviour in copper below 2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065891
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  • 7
    Electronic Resource
    Electronic Resource
    μ+ diffusion in copper studied by zero field μSR (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 109-115 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Diffusion of muons in high purity Cu was studied by the zero-fieldμSR method at temperatures from 134 K down to 0.09 K. The experimental data show clear evidence that the muons still diffuse below 15 K; the measured diffusion rate has a minimum at around 15 K and seems to become independent of temperature below about 0.5 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065890
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  • 8
    Electronic Resource
    Electronic Resource
    Localization, diffusion and trapping of positive muons in al and diluteAlMn andAlLi compounds (1981)
    Springer
    Hyperfine interactions 8 (1981), S. 681-684 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01037546
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  • 9
    Electronic Resource
    Electronic Resource
    Diffusion of positive mouns in copper detected by zero-field μSR (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 205-210 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the Zero-Field μSR method coupled with the unique pulsed muon beam, new systematic measurements of diffusion (hopping) rate of positive muon were performed for the two ultra-pure copper samples (residual resistivity ratio = 18,000 and 7,350) and for the copper doped with 95 ppm iron. For these measurements a new detection system with an improved time resolution was installed to reduce the distortion of μ-e decay time spectrum due to the counting loss of positrons. A preliminary result suggests that the leveling-off of the hopping rate below 0.5 K is not affected by the purity for the ultra-pure sample, while it is strongly modified for the doped copper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401560
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  • 10
    Electronic Resource
    Electronic Resource
    Purity control of metals and of their alloys used in solid state physics by spark source mass spectrometry (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 309 (1981), S. 269-273 
    Details
    ISSN: 1618-2650
    Keywords: Reinheitskontrolle von Metallen, Aluminium, Niob, Thulium-Aluminium ; Massenspektrometrie, Funken ; Festkörperphysik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The investigation of the dynamics of particle populations in solids is an important field of research in solid state physics. For these studies well characterized samples, especially with respect to their impurity contents, are needed. Spark source mass spectrometry is an ideal tool to perform the required analysis. It is demonstrated with the help of typical examples like aluminium, niobium and a rare earth-aluminium compound that spark source mass spectrometry fulfills the requirements of the purity control for a very wide range of substances.
    Notes: Zusammenfassung Die Untersuchung der Dynamik von Teilchen in Festkörpern ist ein wichtiges Arbeitsgebiet der Festkörperphysik. Hierzu sind Proben erforderlich, die hinsichtlich ihrer Restverunreinigungen gut charakterisiert sind. Zur Analyse solcher Proben ist die Funken-Massenspektrometrie besonders geeignet. An den Beispielen Aluminium, Niob und einer Seltene Erd-Aluminiumverbindung wird gezeigt, daß die Funken-Massenspektrometrie die Forderungen der Reinheitskontrolle an so unterschiedlichen Substanzen voll erfüllen kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488599
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