Electrical, magneto-, and optical conductivity of quasicrystals in the Al-Re-Pd system
Journal Article
·
· Physical Review, B: Condensed Matter
- Laboratorium fuer Festkoerperphysik, Eidgenoessische Technische Hochschule Hoenggerberg, CH-8093 Zuerich (Switzerland)
Measurements of the electrical conductivity {sigma}(T) and magnetoconductivity {Delta}{sigma}(H) of icosahedral Al{sub 70}Re{sub 10}Pd{sub 20} and Al{sub 70}Re{sub 8.6}Pd{sub 21.4} quasicrystals at low temperatures and in high magnetic fields H are reported. Below 0.2 K, {sigma} of Al{sub 70}Re{sub 10}Pd{sub 20} varies as {sigma}(T)={sigma}{sub 0}+aT{sup 1/2} with {sigma}{sub 0}=30{Omega}{sup {minus}1}cm{sup {minus}1} and a{lt}0. The conductivity decreases with increasing magnetic field. For Al{sub 70}Re{sub 8.6}Pd{sub 21.4} {sigma}(T) decreases with decreasing T and saturates at the level {sigma}{sub 0}=1.7 {Omega}{sup {minus}1}cm{sup {minus}1} below 0.1 K. In magnetic fields up to 40kOe, {Delta}{sigma}(H) is negative below 1K and {sigma}(T,H) remains temperature-independent at the lowest temperatures. The optical conductivity {sigma}({omega}) is obtained from reflectivity data in the frequency range between 15 and 10{sup 5}cm{sup {minus}1}. The main contributions to {sigma}({omega}) are a broad absorption signal centered at about 0.1 eV and a sizable peak with its maximum at 2.6 eV. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 467389
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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