Effect of Grain Boundaries on the Electrical Resistivity of High-Purity Iron at 4.2°K

Arajs, Sigurds; Oliver, B.F.; Michalak, J. T.

doi:10.1063/1.1709740

Cited by 30 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[62] More discussions on the sensitivity of this value to the onset slope of XANES spectrum will be found later. Regarding R value for Fe in literature, there is at least one experimental report on the effect of grain boundaries on the electric resistivity of iron, [74] however, Mayadas and Shatzkes did not report the R value for iron due to complications in interpreting the results, which are stemming from the magnetism of iron. [57] We emphasize that, although the accurate value of R for iron is not known, a poly crystalline iron must show lower thermal conductivity than that of a single crystal due to the grain boundary scattering.…”

Section: Ii-v Thermal Conductivitymentioning

confidence: 99%

Ab initio modeling of nonequilibrium electron-ion dynamics of iron in the warm dense matter regime

et al. 2018

View full text Add to dashboard Cite

Spatiotemporal electron and ion relaxation dynamics of iron induced by femtosecond laser pulse was studied using one dimensional Two Temperature Model (1D-TTM) where the electron and ion temperature dependent thermophysical parameters, specific heat (C), electron-phonon coupling (G), and thermal conductivity (K), are calculated with ab-initio density-functional-theory (DFT) simulations. Based on the simulated time evolutions of electron and ion temperature distributions (T e (x,t) and T i (x,t)), time evolution of X-ray Absorption Near Edge Spectroscopy (XANES) was calculated and compared with experimental results reported by Fernandez-Pañella et al. where the slope of XANES spectrum at the onset of absorption (s) was used due to its excellent sensitivity to the electron temperature. Our results indicate that ion temperature dependences on G and C, that are largely neglected in the past studies, are very important for studying non-equilibrium electron-ion relaxation dynamics of iron in warm dense matter (WDM) condition. It is also shown that 1/s behavior becomes very sensitive to thermal gradient profile, in the other words, to the values of K in TTM simulation, for the range of target thickness of about two to four times of the mean free path of conduction electrons. Our approach based on 1D-TTM and XANES simulations can be used to determine optimal combination of target geometry and laser fluence for a given target material that will enable us to tightly constraint thermophysical parameters under electron-ion non-equilibrium WDM condition.

show abstract

Section: Ii-v Thermal Conductivitymentioning

confidence: 99%

Ab initio modeling of nonequilibrium electron-ion dynamics of iron in the warm dense matter regime

et al. 2018

View full text Add to dashboard Cite

show abstract

“…As to the abrupt increase of resistivity for the NiSi nanowire with the linewidth of 32 nm, it may be explained by the enhanced grain boundary scattering effect or reduced interface area at thinner linewidth (the mean crystallite size of 17 nm is comparable to the linewidth of about 30 nm). And it may also be due to the higher interface barrier of cascaded NiSi crystallites for electrons to tunnel through between the electrodes [19].…”

Section: Resultsmentioning

confidence: 99%

Nickel silicide nanowires formed in pre-patterned SiO₂trenches and their electrical transport properties

Wang

Luo

Gu³

2007

Nanotechnology

View full text Add to dashboard Cite

Nickel silicide (NiSi) nanowires with different linewidth (from 1000 to 32 nm) are formed in pre-patterned SiO 2 trenches on a silicon substrate. SiO 2 trenches are milled by focused ion beam (FIB) etching, and an electrical endpoint detection technique is used to control the FIB milling depth to just reveal the silicon surface. The formation is based on Ni thin film deposition and the subsequent annealing at 550 • C. Compared with the previously reported self-aligned formation process of NiSi nanowires, the present technique can form NiSi nanowires with controlled length and linewidth because of the pre-patterning of the SiO 2 trenches. The as-formed NiSi nanowires show metallic transport characteristics with a rather low resistivity of about 15 μ cm, which exhibits very weak dependence on linewidth above 50 nm. The lowest resistivity of the nanowire is observed at a linewidth of about 100 nm. The low resistivity is thought to be due to the good crystalline structure of our as-formed NiSi nanowires. When the linewidth of NiSi nanowires is decreased to 32 nm, the resistivity increased abruptly to 22.7 μ cm, which can be explained by considering the short electron mean free path (about 5 nm), as well as the obvious effect of grain boundary on electron transport properties of NiSi.

show abstract

Electrical Resistivity Studies of Iron–Nitrogen Solid Solutions

Wagenblast¹,

Arajs²

1968

Physica Status Solidi (b)

View full text Add to dashboard Cite

The electrical resistivity of iron-nitrogen solid solutions prepared from high purity iron has been studied as a function of applied longitudinal magnetic fields up to 60 kOe a t 4.2 OK. It is demonstrated that the presence of interstitial nitrogen increases the resistivity of iron and alters the shape of resistivity vs. magnetic field curves, particularly a t low fields.By extrapolating the data to B = 0, where B is the internal magnetic induction, it has been possible to determine that the residual resistivity contribution per 1 at% nitrogen in solid solution in iron is about 6.1 pncm.

show abstract

Effect of Grain Boundaries on the Electrical Resistivity of High-Purity Iron at 4.2°K

Cited by 30 publications

References 7 publications

Ab initio modeling of nonequilibrium electron-ion dynamics of iron in the warm dense matter regime

Ab initio modeling of nonequilibrium electron-ion dynamics of iron in the warm dense matter regime

Nickel silicide nanowires formed in pre-patterned SiO₂trenches and their electrical transport properties

Electrical Resistivity Studies of Iron–Nitrogen Solid Solutions

Contact Info

Product

Resources

About

Effect of Grain Boundaries on the Electrical Resistivity of High-Purity Iron at 4.2°K

Cited by 30 publications

References 7 publications

Ab initio modeling of nonequilibrium electron-ion dynamics of iron in the warm dense matter regime

Ab initio modeling of nonequilibrium electron-ion dynamics of iron in the warm dense matter regime

Nickel silicide nanowires formed in pre-patterned SiO2trenches and their electrical transport properties

Electrical Resistivity Studies of Iron–Nitrogen Solid Solutions

Contact Info

Product

Resources

About

Nickel silicide nanowires formed in pre-patterned SiO₂trenches and their electrical transport properties