Interplay of the Boltzmann-type ordinary transport and quantum corrections in Ag-Cu-Ge amorphous alloy system. I. Temperature dependence of electrical resistivity

Mizutani, Uichiro; Sato, Kyosuke; Sakamoto, Isao; Yonemitsu, K.

doi:10.1088/0305-4608/18/9/018

Cited by 22 publications

(18 citation statements)

References 13 publications

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“…The Q-T curves below 300 K change from types a to c with increasing Ge content in the low-resistivity region x 5 30, where g is kept unity [3]. As is clear from Fig.…”

Section: F Fmentioning

confidence: 64%

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Electron Transport in Non‐Periodic Metallic Systems: Amorphous Alloys and Quasicrystals

Mizutani

1993

Physica Status Solidi (b)

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“…The Q-T curves below 300 K change from types a to c with increasing Ge content in the low-resistivity region x 5 30, where g is kept unity [3]. As is clear from Fig.…”

Section: F Fmentioning

confidence: 64%

“…An amorphous single phase can be obtained in the (Ago,,Cuo,,)loo~xGex alloys over the range 0 5 x 5 100 in the form of a thin film by the vapor deposition onto a substrate at 77 K [3] and in the form of ribbons over the range 20 x 5 27.5 by liquid quenching [13].…”

Section: Scattering Mechanism In Amorphous Ag-cu-ge Alloysmentioning

confidence: 99%

Electron Transport in Non‐Periodic Metallic Systems: Amorphous Alloys and Quasicrystals

Mizutani

1993

Physica Status Solidi (b)

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“…Figure 1(a) and (b) reproduce the Ge concentration dependence of the resistivity at 300 K together with that of the Hall coefficient for a series of the amorphous (Ag 0.5 Cu 0.5 ) 100−x Ge x alloys [5][6][7][8]. The data for the electronic specific heat coefficient are included in the inset to figure 1(b).…”

Section: Test Of G 2 -Dependence Of the Conductivity In Sp-electron S...mentioning

confidence: 94%

“…x 60) [5,7], (Ag 0.5 Cu 0.5 ) 77.5 Si 22.5 [13] and Mg 70 Zn [15]. Full and dashed lines having a slope of −2 are drawn to pass through the data points for the first and second families, respectively.…”

Section: (N (E F )) 2 Dependence Of the Conductivity In Sp-and D-elec...mentioning

confidence: 99%

Role of the pseudogap in the electron transport of quasicrystals and their approximants

Mizutani

1998

J. Phys.: Condens. Matter

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There are two routes in the opening of the pseudogap: one due to the band separation in a disordered system such as expanded liquid mercury and amorphous alloys and the other due to the Fermi surface-Brillouin zone interaction in quasicrystals and their approximants. The role of the pseudogap in the electron transport has been studied by plotting resistivities at 4.2 and 300 K against the electronic specific heat coefficient for a total of 49 quasicrystals and their approximants on the log-log diagram in comparison with those for the amorphous alloys. Among them, 32 data points are for sp-electron quasicrystals and their approximants like Al-Mg-Zn, Al-Li-Cu, Mg-Zn-Ga while 17 data points are for the Mackay icosahedral-type quasicrystals like Al-Cu-Fe and Al-Cu-Ru. All the data except for the Al-Pd-Re quasicrystal of high quality are found to fall on a straight line with a slope of -2. Whether or not the data for the Al-Pd-Re quasicrystal of high quality can be treated on the same footing is left for further investigation. From this we conclude that the resistivity changes in proportion to the square of the density of states (DOS) at the Fermi level in conformity with the Mott theory for all systems characterized by the pseudogap across the Fermi level.

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“…The T -dependence of the resistivity can be complicated, with many contributions from very different sources (Butenko et al, 1990;Mizutani et al, 1988;Yildiz et al, 2009). 2. In the presence of magnetic impurities, or impurities with a large spin-orbit coupling, the soft fermionic modes in the disordered case will be suppressed (Belitz and Kirkpatrick, 1994;Lee and Ramakrishnan, 1985), and the nature of the FM QPT is unclear.…”

Section: B Open Problemsmentioning

confidence: 99%

Metallic quantum ferromagnets

et al. 2016

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We give an overview of quantum phase transitions (QPTs) in metallic ferromagnets, discussing both experimental and theoretical aspects. These QPTs can be classified with respect to the presence and strength of quenched disorder: Clean systems generically show a discontinuous, or first-order, QPT from a ferromagnetic to a paramagnetic state as a function of some control parameter, as predicted by theory. Disordered systems are much more complicated, depending on the disorder strength and the distance from the QPT. In many disordered materials the QPT is continuous, or second order, and Griffiths-phase effects coexist with QPT singularities near the transition. In other systems the transition from the ferromagnetic state at low temperatures is to a different type of long-range order, such as an antiferromagnetic or a spin-density-wave state. In still other materials a transition to a state with glass-like spin dynamics is suspected. The review provides a comprehensive discussion of the current understanding of these various transitions, and of the relation between experiment and theory.

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Interplay of the Boltzmann-type ordinary transport and quantum corrections in Ag-Cu-Ge amorphous alloy system. I. Temperature dependence of electrical resistivity

Cited by 22 publications

References 13 publications

Electron Transport in Non‐Periodic Metallic Systems: Amorphous Alloys and Quasicrystals

Electron Transport in Non‐Periodic Metallic Systems: Amorphous Alloys and Quasicrystals

Role of the pseudogap in the electron transport of quasicrystals and their approximants

Metallic quantum ferromagnets

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