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Studies of icosahedral AlPdRe quasicrystals across the metal-insulator transition
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
2004 (English)In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 334, 356-362 p.Article in journal (Refereed) Published
Abstract [en]

The metal-insulator transition (MIT) in icosahedral AlPdRe quasicrystals is investigated by studying changes in sample properties across the transition. The magnetoresistance (MR) the conductivity sigma(T), and the magnetic susceptibility chi(T) have been studied. The MR results show that an MIT occurs for resistance ratios R [ = rho(4.2 K)/rho(295 K)] of about 20-30. sigma(0 K) is finite, and decreases over four orders of magnitude with increasing R. Besides the MR, the most prominent change in a studied property across the MIT is a change of slope of log sigma(0) vs R. In contrast, no features in the resistivity from 1.5 to 300 K reveals an MIT. New results for chi(T, R) are presented. The diamagnetic Z decreases from the metallic to the insulating side, while on the insulating side chi(T,R) is almost independent of R. Although the MR indicates a disorder driven MIT, there is no support for this picture from the results for Z.

Place, publisher, year, edition, pages
2004. Vol. 334, 356-362 p.
Keyword [en]
al-pd-re, electron-transport, i-alpdre, conductivity, magnetoresistance, regime, susceptibility, localization, resistivity, systems
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-23212DOI: 10.1016/j.jnoncrysol.2003.12.002ISI: 000189274200073Scopus ID: 2-s2.0-17744409940OAI: oai:DiVA.org:kth-23212DiVA: diva2:341910
Note
QC 20100525 QC 20111019Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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