1996 Fiscal Year Final Research Report Summary
Experimental and Theoretical Research for Electrical Properties of Quasicrystals
| Project/Area Number |
07455254
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | The University of Tokyo |
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Principal Investigator |
INO Hiromitsu The University of Tokyo, Department of Materials Science, Professor, 大学院・工学系研究科, 教授 (20029466)
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| Co-Investigator(Kenkyū-buntansha) |
KIMURA Kaoru The University of Tokyo, Department of Materials Science, Associate Professor, 大学院・工学系研究科, 助教授 (30169924)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Quasicrystal / Al-Pd-Re / Al-Cu-Ru / Electrical Conductivity / Hall Effect / Magnetoresistance |
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| Research Abstract |
The formation range of single icosahedral phase in the Al-Pd-Re system has been extensively studied based on a large variety of alloys with slitely different compositions. Composition dependence of electrical resistivity was successfully obtained for the first time in the Al-Pd-Re system. In order to elucidate the origin of the composition dependence of resistivity, the quasilattice constant and the intensities of the 1/2(311111)superlattice peak and the(211111)five fold peak have been closely investigated and it has been found that an increase of the quasilattice constant and deviation from closely packed structures coincide with an increase of the resistivity of alloys. Measurements of the temperature dependences of the resistivity, Hall coefficient and magnetoresistance on samples with different compositions and different resistivity values have been presented to shed light on the conduction mechanism in the insulating Al-Pd-Re quasicrystal. Discussions on the conduction mechanism are presented in terms of the band scheme. An analysis on the temperature dependence of conductivity and Hall coefficient in high temperature region(>20K)are performed based on the two band model which takes account of the temperature variation of the effective electrons and holes. The conductivity and magnetoresistance data in low temperature region(<20K)are analyzed in the framework of the weak localization and the electron-electron interaction theories.
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