Influence of dislocation microstructure on low temperature magnetoresistance in copper single- and polycrystals

Niewczas, M.; Bian, Q.

doi:10.1016/j.matdes.2016.02.009

Cited by 5 publications

(22 citation statements)

References 73 publications

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“…As the residual resistivity increases or the RRR decreases, the MR decreases. A reduction in MR is observed in gold film and bulk copper, which results from the enhancement of the scattering sources, such as dislocations, grain boundaries, and impurities 28,29 . The RRR values of MF4, MF5 and the Cu microwire are 2.6, 3.1 and 56.7, respectively.…”

Section: Mr At Low Temperaturesmentioning

confidence: 99%

Metal nanofibrils embedded in long free-standing carbon nanotube fibers with a high critical current density

Rho

Park

et al. 2018

NPG Asia Mater

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With the growth of nanoelectronics, the importance of thermal management in device packaging and the improvement of high-current-carrying interconnects/wires for avoiding the premature failure of devices have been emphasized. The heat and electrical transport properties of the bulk may not be valid in the characterization of a material at the nanometer level, because the phenomena that occur at the interfaces and grain boundaries become dominant. The failure mechanism of bulk metal interconnects has been understood in the context of electromigration; however, in nanoscale materials, the effect of the heat dissipation that occurs at the nanointerfaces may play an important role. Here, we report the preparation of continuous carbon nanotube (CNT)-Cu composite fibers that possess Cu nanofibrillar structures with a high current-carrying capacity. Various-shaped CNT-Cu microfibers with different Cu grain morphologies were produced via Cu electroplating on continuous CNT fibers. Cu fibril structures were embedded in the voids inside the CNT fiber during the early stage of electrodeposition. The temperaturedependent and magnetic field-dependent electrical properties and the ampacity of the produced CNT-Cu microfibers were measured, and the failure mechanism of the fiber was discussed. The interconnection of Cu nanograins on the surface of the individual CNTs contributed to the enhancement in the charge-carrying ability of the fiber. The effective ampacity of the Cu nanofibrils was estimated to be~1 × 10 7 A/cm 2 , which is approximately 50 times larger than the ampacity measured for a bulk Cu microwire.

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Section: Mr At Low Temperaturesmentioning

confidence: 99%

Metal nanofibrils embedded in long free-standing carbon nanotube fibers with a high critical current density

Rho

Park

et al. 2018

NPG Asia Mater

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“…The present work is the continuation of our previous studies [7]. The aim is to provide a theoretical foundation for the experimental results reported there and to gain insight into the effect of dislocation microstructure on low temperature transverse magnetoresistance in copper.…”

Section: Introductionmentioning

confidence: 58%

“…The theory relies on the above-mentioned two-band scattering model with different relaxation times for belly and neck electrons, enabling us to reproduce the TMR behaviour of single crystals in arbitrary orientation of the magnetic field and in polycrystals at different stages of microstructure evolution, as reported in Ref. [7] for copper. Nevertheless, the present theory is applicable to all metals with an open Fermi surface.…”

Section: Overview Of Effective Medium Theory For Crystals With Internmentioning

confidence: 99%

“…Considerable efforts have been directed to understand these processes, but no theory capable of describing magnetotransport of electrons in the material containing often complex dislocation arrangements has been developed so far. In recent paper [7], we have reported experimental studies on the influence of lattice dislocations on transverse magnetoresistivity (TMR) in single and polycrystals of copper at 2 K. The results show that dislocations strongly affect the dependence of TMR on the magnetic field and suppress magnetoresistivity (MR) anisotropy. In the orientations of closed belly orbits, TMR follows Kohler's rule, independent on the density of dislocations stored in the single crystals.…”

Section: Introductionmentioning

confidence: 99%

“…This causes upward deviation from Kohler's rule with respect to dislocation-free crystals. However, when the electrons move in the belly orbits, the relaxation time τ b due to dislocation and impurity scattering is isotropic, leading to conservation of Kohler's rule in distorted crystals [7].…”

Section: Introductionmentioning

confidence: 99%

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Theory of magnetoresistance due to lattice dislocations in face-centred cubic metals

Bian

Niewczas

2016

Philosophical Magazine

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A theoretical model to describe the low temperature magnetoresistivity of high purity copper single and polycrystals containing different density and distribution of dislocations has been developed. In the model, magnetoresistivity tensor is evaluated numerically using the effective medium approximation. The anisotropy of dislocation-induced relaxation time is considered by incorporating two independent energy bands with different relaxation times and the spherical and cylindrical Fermi surfaces representing open, extended and closed electron orbits. The effect of dislocation microstructure is introduced by means of two adjustable parameters corresponding to the length and direction of electron orbits in the momentum space, which permits prediction of magnetoresistance of FCC metals containing different density and distribution of dislocations. The results reveal that dislocation microstructure influences the character of the field-dependent magnetoresistivity. In the orientation of the open orbits, the quadratic variation in magnetoresistivity changes to quasi-linear as the density of dislocations increases. In the closed orbit orientation, dislocations delay the onset of magnetoresistivity saturation. The results indicate that in the open orbit orientations of the crystals, the anisotropic relaxation time due to small-angle dislocation scattering induces the upward deviation from Kohler's rule. In the closed orbit orientations Kohler's rule holds, independent of the density of dislocations. The results obtained with the model show good agreement with the experimental measurements of transverse magnetoresistivity in deformed single and polycrystal samples of copper at 2 K. ARTICLE HISTORY

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Generation mechanism and dual-dynamics simulation of surface patterns in single-point diamond turning of single-crystal copper

Zhang

Han

Chen

et al. 2022

Journal of Manufacturing Processes

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Influence of dislocation microstructure on low temperature magnetoresistance in copper single- and polycrystals

Cited by 5 publications

References 73 publications

Metal nanofibrils embedded in long free-standing carbon nanotube fibers with a high critical current density

Metal nanofibrils embedded in long free-standing carbon nanotube fibers with a high critical current density

Theory of magnetoresistance due to lattice dislocations in face-centred cubic metals

Generation mechanism and dual-dynamics simulation of surface patterns in single-point diamond turning of single-crystal copper

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