Electronic properties of sp-electron dominant quasicrystalline alloys

Matsuda, Takeshi; Sakabe, Y; Ohara, Ichiro; Mizutani, Uichiro

doi:10.1016/0022-3093(90)90650-b

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…The Mg based quasicrystals are of particular interest from the viewpoint of electron transport, since the Fermi level is located in the sp band and is free from any magnetic effect and from the d-electron conduction. These electronically simple quasicrystals are considered to be of prime importance in studying the scattering mechanism of conduction electrons travelling in the quasiperiodic lattice (Wagner et a1 1988, Bruhwiler 1988, Matsuda et a1 1989, 1990. Extensive experimental studies under the same guiding 0953-8984/90/286153 + 15 $03.50 @ 1990 IOP Publishing Ltd principle have been made for the sp-electron amorphous alloys and the scattering mechanism involved has been elucidated (Mizutani 1988a, b).…”

Section: Introductionmentioning

confidence: 99%

Electronic properties of icosahedral quasicrystals in Mg-Al-Ag, Mg-Al-Cu and Mg-Zn-Ga alloy systems

Mizutani

Sakabe

Matsuda

1990

J. Phys.: Condens. Matter

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The electronic structure and the electron transport properties of sp-electron quasicrystals have been studied, using in total, 20 quasicrystals in the three alloy systems Mg-Al-Ag, Mg-Al-Cu and Mg-Zn-Ga. We revealed that the temperature dependence of the electrical resistivity changes its characteristic features with increasing resistivity in the same manner as that in the non-magneticamorphous alloys. Thisisapparentlyconsistent with the generalised Faber-Ziman theory, but this simple model poses difficulties in explaining a definite increase in the resistivity upon improvement in the quasicrystallinity, brought about by the heat-treatment of the Mg3, 5Zn40Ga20 quasicrystal. The Hall coefficient exhibits the sizable temperature dependence when its magnitude deviates from the free electron value, suggesting the important role of the Fermi surface-Brillouin zone interaction. The temperature dependence of the thermoelectric power below 300 K is found to be non-linear, as opposed to a more linear one in the amorphous alloy. The electronic specific heat coefficient plotted against the electron concentration e/a exhibits a universal trend regardless of the alloy system and decreases with decreasing e/a from the free electron value to about onethird of the free electron value. It is noted that a thermally stable quasicrystal apparently possesses a reduced electronic specific heat coefficient.

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Section: Introductionmentioning

confidence: 99%

Electronic properties of icosahedral quasicrystals in Mg-Al-Ag, Mg-Al-Cu and Mg-Zn-Ga alloy systems

Mizutani

Sakabe

Matsuda

1990

J. Phys.: Condens. Matter

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show abstract

“…In the case of Mg-Al-(Zn, Cu, Ag) [256,260], the temperature dependence of the resistivity suggests that the scattering mechanism in the quasicrystalline phase is essentially the same as in the corresponding amorphous phase. The temperature dependence of the Hall coefficient and the thermopower, however, are found to be unique to quasicrystals.…”

Section: Quasicrystalsmentioning

confidence: 99%

“…In a plot of the resistivity versus the electronic specific heat, the data for sp-and d-electron systems fall into different branches [256,260]. Such a plot provides interesting information on the Fermi velocity and the electronic mean free path.…”

Section: Quasicrystalsmentioning

confidence: 99%

“…The temperature dependence of the Hall coefficient and the thermopower, however, are found to be unique to quasicrystals. The behaviour of the resistivity can be explained by means of the generalized Faber-Ziman theory [265], which is believed [256,260] to be applicable to quasicrystals, as far as the electronic mean free path is longer than the average atomic distance or the resistivity is less than about 200 pi2 cm, as observed in the system quoted.…”

Section: Quasicrystalsmentioning

confidence: 99%

“…[260]) Al-Cu-Li and Al-Cu-Ru quasicrystals the resistivity exceeds 800 [266] and 1600 pi2 cm [260], respectively. It has been argued [256,260] that in these materials weak localization governs the electron transport. The high value of the resistivity and the very low value of the electronic specific heat observed in A1-Cu-(Li, Ru) suggests the existence of a structure-induced minimum in the electron density of states at the Fermi level [256, 2601. Icosahedral Mg,Zn,Al [254] is a well behaved, weakly coupled superconductor with an electron density of states close to the free-electron model.…”

Section: Quasicrystalsmentioning

confidence: 99%

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