An anisotropic phase field crystal model for isotropic and anisotropic crystal lattice systems of arbitrary Poisson ratio
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cond-mat.other↗
arXiv subjects
R. Haberkern
Publications and source records attributed to R. Haberkern.
Magnetoconductivity of icosahedral and amorphous Al-Pd-Re films - a comparison
The magnetoconductivity of quasicrystals is often discussed in the frame of quantum corrections, namely weak (anti-) localiza-tion and electron-electron interaction. A premise for both effects is a strong elastic scattering of conduction electrons. Amorphous and icosahedral phases are discussed as Hume-Rothery alloys with an electronically induced structural peak at the diameter of the Fermi sphere. Therefore, both should exhibit quantum corrections. The preparation of quasicrystalline films via the amorphous route offers the possibility to compare the magnetoconductivity on samples of identical composition but different structure. We report on magnetoconduc-tivity measurements at temperatures between 0.2 K and 22 K and for magnetic fields up to 16 T. With the exception of the electronic diffusion constant, amorphous as well as icosahedral Al-Pd-Re films can be described by nearly the same set of parameters if the samples are well on the metallic side of the metal-insulator transition.
cond-mat.dis-nn↗
Electronic-Transport Properties of Al-Cu-Fe Thin Films
Amorphous samples of Al-Cu-Fe were crystallized to the icosahedral phase under the control of electrical conductivity and thermopower at a rather small temperature of T=720 K. A comparison between different annealing states of the amorphous and the resulting quasicrystalline phase done on the same sample shows aston-ishing parallels in conductivity and large differences in thermopower.
cond-mat.mtrl-sci↗
Fabrication of High Quality QC Films via the Route of the Amorphous Phase
We discuss the preparation of thin icosahedral films (Al-Cu-Fe and Al-Pd-Re) via the route of the amorphous (a-)phase which in some aspects is a precursor to the icosahedral phase. A direct transition from the a- to the i-phase occurs for Al-Cu-Fe films at 430 C on the time scale of minutes. The resulting films are of good quality as shown by diffraction and electronic transport properties. The surface of the resulting films is very smooth.
cond-mat.mtrl-sci↗