Temperature dependent crossover between positive and negative magnetoresistance in graphene nanocrystallines embedded carbon film

Ding, Dong; Dai, Xingze; Wang, Chao; Diao, Dongfeng

doi:10.1016/j.carbon.2020.03.022

Cited by 14 publications

(4 citation statements)

References 41 publications

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“…Similarly, the graphene nanocrystallite embedded carbon coatings [85,86] emerged early in this decade and have demonstrated improved friction behaviour. Fig.…”

Section: Diamond-like Coatings Deposition With Enhancement In Convent...mentioning

confidence: 99%

Deposition of diamond-like carbon coatings: Conventional to non-conventional approaches for emerging markets

Zia

Birkett

2021

Ceramics International

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“…Similarly, the graphene nanocrystallite embedded carbon coatings [85,86] emerged early in this decade and have demonstrated improved friction behaviour. Fig.…”

Section: Diamond-like Coatings Deposition With Enhancement In Convent...mentioning

confidence: 99%

Deposition of diamond-like carbon coatings: Conventional to non-conventional approaches for emerging markets

Zia

Birkett

2021

Ceramics International

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“…Comparable changes in MR with respect to temperature have been observed in other organic systems, [ 39–42 ] and several mechanisms have been proposed to explain these magnetic field‐dependent effects. [ 43–45,46–50 ] In the open‐shell DA CP, both positive and negative MR can be explained by the VRH model.…”

Section: Resultsmentioning

confidence: 93%

Large Room‐Temperature Magnetoresistance in a High‐Spin Donor–Acceptor Conjugated Polymer

Tahir,

Eedugurala,

Hsu

et al. 2023

Advanced Materials

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Open‐shell conjugated polymers (CPs) offer new opportunities for the development of emerging technologies that utilize the spin‐degree of freedom. Their light‐element composition, weak spin orbit coupling, synthetic modularity, high chemical stability, and solution‐processability offer attributes that are unavailable from other semiconducting materials. However, developing an understanding of how electronic structure correlates with emerging transport phenomena remains central to their application. Here, we provide the first connections between molecular, electronic, and solid‐state transport in a high‐spin donor‐acceptor CP, poly(4‐(4‐(3,5‐didodecylbenzylidene)‐4H‐cyclopenta[2,1‐b:3,4‐b’]dithiophen‐2‐yl)‐6,7‐dimethyl‐[1,2,5]‐thiadiazolo[3,4‐g]quinoxaline). At low temperatures (T < 180 K) a giant negative magnetoresistance (MR) is achieved in a thin‐film device with a value of –98% at 10 K, which surpasses the performance of all other organic materials. The thermal depopulation of the high‐spin manifold and negative MR decrease as temperature increases and at T > 180 K, the MR becomes positive with a relatively large MR of 13.5% at room temperature. Variable temperature electron paramagnetic resonance spectroscopy and magnetic susceptibility measurements demonstrate that modulation of both the sign and magnitude of the MR correlates with the electronic and spin structure of the CP. These results indicate that donor‐acceptor CPs with open‐shell and high‐spin ground states offer new opportunities for emerging spin‐based applications.This article is protected by copyright. All rights reserved

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“…Potentially, dominating conductance mechanisms and the possible contribution of topological surface states to the properties of TI-CNT heterostructures may be revealed by analyzing the magnetoresistance measurements of the heterostructures. In recent years, topological insulator nanostructures have been found to exhibit magnetoresistance properties characterized by weak anti-localization (WAL) effects at temperatures below 30 K and low magnetic fields, which originate from the surface states of these materials [23][24][25][26][27]. In turn, the magnetoresistance of CNTs at low temperatures and low magnetic fields reveals the presence of weak localization (WL) effects [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Topological States on the Thermoelectric Performance of p- and n-Type Sb2Te3/Bi2Se3-Multiwalled Carbon Nanotubes Heterostructured Networks

Andzane,

Buks,

Spalva

et al. 2023

Coatings

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The resistance and magnetoresistance of flexible thermoelectric p-type Sb2Te3-MWCNT, p-type Bi2Se3-MWCNT, and n-type Bi2Se3-MWCNT heterostructures were studied in the temperature range from 2 K to 300 K to reveal the conductance mechanisms governing the thermoelectric properties of these heterostructured networks. It was found that the conductance in heterostructured networks at different temperatures is governed by different processes and components of the networks. This effect was found to be related to the growth mechanisms of the Sb2Te3 and Bi2Se3 nanostructures on the MWCNT networks. At near-room temperatures, the Sb2Te3 and Bi2Se3 nanostructures were found to have the dominant contribution to the total conductance of the p-type Sb2Te3-MWCNT and n-type Bi2Se3-MWCNT networks. In turn, the conduction of p-type Bi2Se3-MWCNT heterostructured networks in a full temperature range and p-type Sb2Te3-MWCNT and n-type Bi2Se3-MWCNT heterostructured networks at temperatures below 30 K was governed by the MWCNTs; however, with the contribution from 2D topological states of Sb2Te3 and Bi2Se3 nanostructures, these were manifested by the weak antilocalization effect (WAL) cusps observed at temperatures below 5–10 K for all heterostructured networks considered in this work.

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Temperature dependent crossover between positive and negative magnetoresistance in graphene nanocrystallines embedded carbon film

Cited by 14 publications

References 41 publications

Deposition of diamond-like carbon coatings: Conventional to non-conventional approaches for emerging markets

Deposition of diamond-like carbon coatings: Conventional to non-conventional approaches for emerging markets

Large Room‐Temperature Magnetoresistance in a High‐Spin Donor–Acceptor Conjugated Polymer

The Impact of Topological States on the Thermoelectric Performance of p- and n-Type Sb2Te3/Bi2Se3-Multiwalled Carbon Nanotubes Heterostructured Networks

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