This title appears in the Scientific Report :
2008
Please use the identifier:
http://dx.doi.org/10.1007/s10909-007-9518-3 in citations.
Very low temperature electronic transport in Al-Pd-Re quasicrystalline alloys
Very low temperature electronic transport in Al-Pd-Re quasicrystalline alloys
Electrical resistivities of two icosahedral (I) Al-Pd-Re alloys have been measured between room temperature and mK temperatures. One quasicrystalline (QC) polygrain Al-Pd-Re sample exhibited insulating behavior in its resistivities, increasing by a factor of r=R(4 K)/R(300 K)=7.76; its room temperat...
Saved in:
Personal Name(s): | Rosenbaum, R. |
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Balanetskyy, S. / Grushko, B. / Przepiorzynski, B. | |
Contributing Institute: |
Mikrostrukturforschung; IFF-8 |
Published in: | Journal of low temperature physics, 150 (2008) |
Imprint: |
Dordrecht
Springer Science + Business Media B.V.
2008
|
DOI: |
10.1007/s10909-007-9518-3 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Journal of Low Temperature Physics
150 |
Subject (ZB): | |
Publikationsportal JuSER |
Electrical resistivities of two icosahedral (I) Al-Pd-Re alloys have been measured between room temperature and mK temperatures. One quasicrystalline (QC) polygrain Al-Pd-Re sample exhibited insulating behavior in its resistivities, increasing by a factor of r=R(4 K)/R(300 K)=7.76; its room temperature resistivity was 9,890 mu Omega cm. A "phenomenological" expression fitted the conductivity data well between 300 K to 0.5 K. Below 0.4 K a crossover to an activated variable-range hopping law was observed. Low temperature magnetoresistance ratio data and fits using the wave function shrinkage theory are presented. A second QC Al-Pd-Re sample had a small resistance temperature ratio r=2.12. The room temperature resistivity was extremely large, rho(300 K)approximate to 40,980 mu Omega cm. Its conductivity could be described well using a simple temperature power law between 300 K to 20 K. Below 20 K there was a crossover to a new behavior. Below 1 K, the conductivity could be fitted using a very weakly insulating power law where sigma(T)approximate to 11.37T(0.032) in (Omega cm)(-1), suggesting that this sample is located just below the metal-insulator transition. The magnetoconductivity data could not be fitted successfully using the 3D weak localization (WL) theory and inserting into it physical and realistic fitting magnitudes for the inelastic magnetic field B-in. |