Electron transport in amorphous metals

Naugle, D. G.

doi:10.1016/0022-3697(84)90144-6

Cited by 101 publications

(11 citation statements)

References 82 publications

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“…One can see that S is linearly decreasing from 0 to 60-70 K to reach a negative value of −2, −3 V/K, above 70 K then S is almost constant. These values are in concordance with those observed in the literature for amorphous metals [33][34][35][36].…”

Section: Thermoelectric Propertiessupporting

confidence: 93%

Transport, magnetic and thermal properties of amorphous and crystallized Ce2Ni2Ga ternary gallide

Orveillon-Dubajic¹,

Chevalier²,

Gorsse³

2008

Journal of Alloys and Compounds

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Section: Thermoelectric Propertiessupporting

confidence: 93%

Transport, magnetic and thermal properties of amorphous and crystallized Ce2Ni2Ga ternary gallide

Orveillon-Dubajic¹,

Chevalier²,

Gorsse³

2008

Journal of Alloys and Compounds

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“…Since these samples are single crystals and have reasonably high resistivity ratios one would have expected some signature of a phonon-drag peak in the data. However, the usual signature is totally absent, and S is similar to that in amorphous metals 78,79 and, except for sign, many high-T c cuprate superconductors. 77 It is obvious from the thermopower data that in addition to the diffusion thermopower, which is proportional to the temperature, there is͑are͒ additional contribution͑s͒ to the thermopower yielding the observed temperature dependence of S. Figure 5 shows data (S-bT) vs T for YNi 2 B 2 C and LuNi 2 B 2 C single crystals, where b is the coefficient obtained by fitting the S vs T data to a straight line, i.e., S(T)ϭa ϩbT, in the linear region ͑TϷ100 K to RT͒.…”

Section: B Thermopowermentioning

confidence: 75%

Transport and superconducting properties ofRNi2B2C (R=Y,nLu) si

et al. 1997

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The in-plane resistivity, in-plane absolute thermopower, and upper critical field measurements are reported for single-crystal samples of YNi 2 B 2 C and LuNi 2 B 2 C superconductors. The in-plane resistivity shows metallic behavior and varies approximately linearly with temperature near room temperature ͑RT͒ but shows nearly quadratic behavior in temperature at low temperatures. The YNi 2 B 2 C and LuNi 2 B 2 C single-crystal samples exhibit large transverse magnetoresistance ͑Ϸ6-8 % at 45 kOe͒ in the ab plane. The absolute thermopower S(T) is negative from RT to the superconducting transition temperature T c. Its magnitude at RT is a few times of the value for a typical good metal. S(T) is approximately linear in temperature between Ϸ150 K and RT. Extrapolation to Tϭ0 gives large intercepts ͑few V/K͒ for both samples suggesting the presence of a much larger ''knee'' than would be expected from electron-phonon interaction renormalization effects. The upper critical fields for H parallel and perpendicular to the c axis and the superconducting parameters derived from it do not show any anisotropy for the YNi 2 B 2 C single-crystal samples in agreement with magnetization and torque magnetometry measurements, but a small anisotropy is observed for the LuNi 2 B 2 C single crystals. The analysis shows that these are moderately strong-coupling type-II superconductors ͑similar to the A-15 com-pounds͒ with a value of the electron-phonon coupling parameter ͑0͒ approximately equal to 1.2 for YNi 2 B 2 C and 1.0 for LuNi 2 B 2 C, the Ginzburg-Landau coherence length ͑0͒ approximately equal to 70 Å, and H c2 (0)ϳ60-70 kOe. The temperature dependence of the upper critical field shows a positive curvature near T c in disagreement with the Werthamer, Helfand, Hohenberg, and Maki ͑WHHM͒ theory but in agreement with a recent solution of the Gor'kov equation using a basis formed by Landau levels ͑Bahcall͒; however, the data show a severe disagreement between the observed low-temperature behavior of H c2 (T) and that predicted either by WHHM or Bahcall's expressions. ͓S0163-1829͑97͒06413-8͔

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“…Both films exhibit relatively high room temperature resistivities ͑ϳ100 ⍀ cm͒ and negative TCR values, characteristic of amorphous materials. 11,12 At low temperatures, both these films exhibit sharp drops in the resistivity due to the onset of superconductivity. However, it is important to note that while in the case of Cu-70 at.…”

Section: Discussionmentioning

confidence: 99%

The microstructure and electrical transport properties of immiscible copper-niobium alloy thin films

Banerjee

Bose

Genç

et al. 2008

Journal of Applied Physics

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Thin film reaction of transition metals with germaniumMutually immiscible in the solid state, copper and niobium exhibit a relatively strong clustering ͑phase separating͒ tendency in the liquid state and can therefore only be alloyed in a highly metastable form: for example, by vapor quenching. We have deposited metastable Cu-Nb alloy thin films with nominal compositions ranging from 5 to 90 at. % Nb by magnetron cosputtering. The microstructure of these films depends strongly on the composition and ranges from coarse-grained solid solutions for Cu-rich and Nb-rich compositions to phase-separated amorphous mixtures when the two elements are in comparable amounts. The crystalline Cu-or Nb-rich compositions exhibit positive temperature coefficients of resistivity ͑TCR͒ with the Cu-90 at. % Nb film exhibiting a superconducting transition with ͑T C ͒ onset ϳ 4.5 K. The amorphous films show high room temperature resistivity, a negative TCR, and composition dependent superconducting transitions. We investigate the relation between the microstructure, phase stability, and the electrical transport properties.

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Electron transport in amorphous metals

Cited by 101 publications

References 82 publications

Transport, magnetic and thermal properties of amorphous and crystallized Ce2Ni2Ga ternary gallide

Transport, magnetic and thermal properties of amorphous and crystallized Ce2Ni2Ga ternary gallide

Transport and superconducting properties ofRNi2B2C (R=Y,nLu) si

The microstructure and electrical transport properties of immiscible copper-niobium alloy thin films

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