Anisotropy of Residual Electrical Resistivity in High-Purity Aluminum Single Crystals

Hashimoto, Eiji; Ueda, Y.; Tamura, Hiroyasu; Kino, Takao

doi:10.1143/jpsj.62.4178

Cited by 12 publications

(10 citation statements)

References 6 publications

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“…Since natural aluminum (Al) and tantalum (Ta) are almost entirely composed of a single isotope, elastic isotopic scattering should be negligible in these superconductors. Simultaneously, impurity scattering in these materials is minimal due to the use of very pure single crystals (float zone refining is easily implemented in single crystal metals [33]). Thus -as was the case for excited quasiparticles in aluminum -athermal phonons in aluminum and tantalum should be ballistic for O(1 cm)-sized absorbers.…”

Section: Jhep08(2016)057mentioning

confidence: 99%

Detecting superlight dark matter with Fermi-degenerate materials

Hochberg

Pyle

Zhao

et al. 2016

J. High Energ. Phys.

203

239

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We examine in greater detail the recent proposal of using superconductors for detecting dark matter as light as the warm dark matter limit of O(keV). Detection of such light dark matter is possible if the entire kinetic energy of the dark matter is extracted in the scattering, and if the experiment is sensitive to O(meV) energy depositions. This is the case for Fermi-degenerate materials in which the Fermi velocity exceeds the dark matter velocity dispersion in the Milky Way of ∼ 10 −3 . We focus on a concrete experimental proposal using a superconducting target with a transition edge sensor in order to detect the small energy deposits from the dark matter scatterings. Considering a wide variety of constraints, from dark matter self-interactions to the cosmic microwave background, we show that models consistent with cosmological/astrophysical and terrestrial constraints are observable with such detectors. A wider range of viable models with dark matter mass below an MeV is available if dark matter or mediator properties (such as couplings or masses) differ at BBN epoch or in stellar interiors from those in superconductors. We also show that metal targets pay a strong in-medium suppression for kinetically mixed mediators; this suppression is alleviated with insulating targets.

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Section: Jhep08(2016)057mentioning

confidence: 99%

Detecting superlight dark matter with Fermi-degenerate materials

Hochberg

Pyle

Zhao

et al. 2016

J. High Energ. Phys.

203

239

View full text Add to dashboard Cite

show abstract

“…Possible explanations for the normal resistance in zero magnetic field are as follows: 1. In aluminum single crystal with RRR % 100 000, the bulk mean free path l b along the h100i current direction is only 60% of that along the h110i direction [12,13]. Therefore, the effect of the ballistic conduction of electrons is weakened, resulting in the normal bend resistance.…”

Section: Resultsmentioning

confidence: 99%

Ballistic Electron Transport Characteristics in High-Purity Aluminum Single Crystals

Ueda

Hashimoto

Kino

1998

phys. stat. sol. (a)

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Negative bend resistance was observed at 4.2 K in cross‐shaped specimens cut from a high‐purity aluminum single crystal with a residual resistance ratio RRR of about 100000. The cross section of arms of the specimens was 0.5×0.4 mm2 and the bulk mean free path lb of conduction electrons in the material was about 3 mm. The negative bend resistance was enhanced in a magnetic field parallel to a pair of arms. Nonlinear I–V characteristics were observed when one of the potential probes was placed on an arm at a distance less than lb from the center of the intersection of the arms. Besides, the I–V characteristics depended strongly on the volume of a reservoir for incident electrons, left behind the potential probe. The negative bend resistance and the nonlinear I–V characteristics were attributed to the ballistic conduction of electrons. The orientation dependence of the ballistic conduction was also examined.

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“…The contribution of the preferred orientations of the Al'and Ti filaments to the electrical resistivity was assumed to be nil at 300 K, based on the findings of Hashimoto [43]. Both room temperature and high temperature electrical resistivity measurements will be done on the alloy to determine whether the Ti-filaments will have a significant effect on the conductivity.…”

Section: Statement Of Workmentioning

confidence: 99%

“…Due to the highly directional nature of the DMMC'microstructure, the resistivity is probably anisotropic, and the resistivity in directions perpendicular to the specimen's rod axis (not measured in this study) is presumably higher than the values presented in Table 5. The contribution of the preferred orientations of the Al and Ti filaments to the electrical resistivity is assumed to be nil at 300 K, based on the findings of Hashimoto [43].…”

Section: Resistivity Measurementsmentioning

confidence: 99%

Microstructure-strength relationship of a deformation processed aluminum-titanium composite

Lund¹

1998

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Anisotropy of Residual Electrical Resistivity in High-Purity Aluminum Single Crystals

Cited by 12 publications

References 6 publications

Detecting superlight dark matter with Fermi-degenerate materials

Detecting superlight dark matter with Fermi-degenerate materials

Ballistic Electron Transport Characteristics in High-Purity Aluminum Single Crystals

Microstructure-strength relationship of a deformation processed aluminum-titanium composite

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