Hochfrequenzwiderstand abschreckend kondensierter supraleitender Metallschichten

Reichert, V.; Hasse, J.

doi:10.1007/bf01379686

Cited by 18 publications

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“…It is zero if the effective masses of p-and s-electrons are equal. For amorphous metals the effective mass is about twice as big as the free electron mass [21]. For liquid metals the deviation of the effective mass from the free electron mass is about 10 % [22].…”

Section: Discussionmentioning

confidence: 99%

Temperature dependence of the electrical resistivity in amorphous metals

1973

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In amorphous metals the electrical resistivity increases linearly in the temperature range from 2 to 40 K. This result differs fundamentally from the nonlinear behaviour known for crystalline metals and it suggests the conduction electrons not to be scattered by the vibrations of the amorphous point lattice. The temperature dependent part of the resistivity in anaorphous metals is explained with scattering of conduction electrons by fluctuations of p-electrons. Properties of Amorphous MetalsAmorphous metals can be produced by condensation of the metal vapour onto a cold substratum [l]. In general, additions of other components are necessary. Amorphous metals are metastable and exist only below a temperature of about the same order of magnitude as the Debye temperature. The transition "amorphous-crystalline" occurs irreversibly and is connected with a latent heat [2,3]. From electronand X-ray diffraction experiments [4,5] it is known that the structure of amorphous metals is very much the same as that of the corresponding liquid metals [6]. Crystalline metal films growing from the vapour phase show elastic stress. The same is true for films of amorphous semiconductors and glasses. Amorphous metals, however, grow without any mechanical stress [7]. In analyzing this fact one has to keep in mind that in the crystalline state these metals have covalent bonds due to the p-electrons. The result for amorphous metals seems to indicate that these covalent bonds are broken, which means, the metal atoms in the amorphous phase are less tightly bound than those in the crystalline phase. Amorphous metals have a higher specific heat than crystalline metals [3,8]. Ewert [8] measured the specific heat between 5 and 8 K and, in the case of Bi, he found a T3-1aw, corresponding to the vibrations of an elastic continuum. The Debye temperature of the amorphous * Parts of this work have been reported by D. Korn at the 6th Summer School for Superconductivity of the "Fachausschul3 Tiefe Temperaturen der Deutschen Physikalischen Gesellschaft" in Pegnitz/Oberfranken, 1970.

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Section: Discussionmentioning

confidence: 99%

Temperature dependence of the electrical resistivity in amorphous metals

1973

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“…Ml/70 15-11-5 (19). Mel 14 (20), anti-asiaio GMI, anti-NK 1-2 and 2-4G2 (21) respectively. For the CD4 and CD8 staining directly conjugated L3T4-PE (GKl-5) and Ly2-FITC (53-6-7) antibodies (Becton Dickinson, Mountain View.…”

Section: Celt Surface Antibody Stainingmentioning

confidence: 99%

Development of thymocytes in organ culture: Migrant cells with natural killer cell characteristics

1989

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Summary During organ culture of foetal thymic lobes, up to 5% of the thymic cells migrate out of the lobes and a majority of these have phenotypic characteristics of thymocytes or macrophages. Interleukin-2 (IL-2) increases the number of these migrant cells, and cytotoxic cells can be detected which display natural killer cell surface markers. In contrast, although cytotoxic activity can be detected in cells from adult thymic fragments cultured with IL-2, the cytotoxic activity is not detected with natural killer sensitive target cells. The appearance of natural killer-like cells during the culture of foetal thymiclobcs suggests that they are involved in differentiation events which occur at this time in the thymus.

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Pb based alloys and compounds

Yu¹,

Kaner²

O (Without Cuprates) - Sc

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Hochfrequenzwiderstand abschreckend kondensierter supraleitender Metallschichten

Cited by 18 publications

References 0 publications

Temperature dependence of the electrical resistivity in amorphous metals

Temperature dependence of the electrical resistivity in amorphous metals

Development of thymocytes in organ culture: Migrant cells with natural killer cell characteristics

Pb based alloys and compounds

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