Enhanced thermal stability and spin-lattice relaxation rate of N@<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mtext>C</mml:mtext><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>inside carbon nanotubes

Tóth, S.; Quintavalle, D.; Náfrádi, Bálint; Korecz, L.; Forró, Lászlø; Simón, F.

doi:10.1103/physrevb.77.214409

Cited by 20 publications

(28 citation statements)

References 32 publications

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“…No mechanistic studies of the route for this encapsulation have been reported, although it is thought to proceed in a similar fashion to C 60 . Until recently, the high temperature of sublimation methods prevented the encapsulation of the thermally sensitive nonmetal endohedral fullerenes; however, the development of room-temperature methods such as solution and supercritical fluid filling has enabled peapod systems of the fullerenes to be formed in modest yields of 5-10% [39,40].…”

Section: Endohedral Fullerenesmentioning

confidence: 99%

Carbon Nanotubes as Containers

Chamberlain

Giménez-López

Khlobystov

2010

Carbon Nanotubes and Related Structures

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Section: Endohedral Fullerenesmentioning

confidence: 99%

Carbon Nanotubes as Containers

Chamberlain

Giménez-López

Khlobystov

2010

Carbon Nanotubes and Related Structures

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“…However, as P becomes larger, this saturation term becomes increasingly important, leading to a decrease in χ . By taking the ratio of χ (P ) to χ (P → 0) the effect of this saturation term can be clearly delineated: 28,30 …”

mentioning

confidence: 99%

Spin relaxation times of single-wall carbon nanotubes

et al. 2013

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We have measured temperature (T )-and power-dependent electron spin resonance in bulk single-wall carbon nanotubes to determine both the spin-lattice and the spin-spin relaxation times, T 1 and T 2 . We observe that T −1 1 increases linearly with T from 4 K to 100 K, whereas T −1 2 decreases by over a factor of two when T is increased from 3 K to 300 K. We interpret the T −1 1 ∝ T trend as spin-lattice relaxation via interaction with conduction electrons (Korringa law) and the decreasing T dependence of T −1 2 as motional narrowing. By analyzing the latter, we find the spin hopping frequency to be 285 GHz. Last, we show that the Dysonian line shape asymmetry follows a three-dimensional variable-range hopping behavior from 3 K to 20 K; from this scaling relation, we extract a localization length of the hopping spins to be ∼100 nm. Understanding spin dynamics is key to a broad range of modern problems in condensed-matter physics 1-6 and applied sciences. 7,8 Spin transport is a sensitive probe of many-body correlations as well as an indispensable process in spintronic devices. Confined spins, particularly those in one dimension (1D), are predicted to show strong correlations 2,4-6,9 and long coherence times.3 Single-wall carbon nanotubes (SWCNTs) are ideal materials for studying 1D spin physics due to their long mean free paths and relatively weak spin-orbit coupling.10 Exotic spin properties in metallic SWCNTs at low temperatures and high magnetic fields have been predicted, including the appearance of a peak splitting in the spin energy density spectrum, which can be used to probe spin-charge separation in Luttinger-liquid theory. [4][5][6] One method for studying spin dynamics is electron spin resonance (ESR), which can provide information on spin-orbit coupling, phase relaxation time, spin susceptibility, and spin diffusion. Many ESR studies of SWCNTs have been performed over the past decade. 5,6,[11][12][13][14][15][16][17][18][19][20][21][22] Unfortunately, substantial conflicts have emerged in the literature, such as the temperature (T ) dependence of the spin susceptibility 12,15,18,22 and whether the ESR is caused by SWCNT defects 11,15,17,21,22 or is intrinsic to nanotubes. 12,13,16,[18][19][20] Because of these divergent empirical observations of nanotube ESR, there is only scant experimental data on electron spin-lattice relaxation times in SWCNTs, which limits our understanding of nanotube spin dynamics.Here, we present a detailed study of the T dependence of both the spin-lattice (T 1 ) and spin-spin (T 2 ) relaxation times of paramagnetic electron spins in SWCNTs. From the T dependence of T 1 , we find that the spin-lattice relaxation rate, T −1 1 , is proportional to T . This trend is consistent with the notion that the probed spins relax through interaction with conduction electrons that are present in metallic SWCNTs in the sample. Additionally, we find that the dephasing rate, T −1 2 , becomes smaller as T is increased, which is a hallmark of the phenomenon of motional narrowing. 23,24 This spin...

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“…It can be increased by encapsulation into carbon nanotubes. 55 The situation is less clear for the optical stability; recent studies indicate that while properly cooled PEF molecules are not harmed by highpower optical irradiation, insufficient cooling may induce thermal instability. 56 This may have caused confusion in some optical stability investigations.…”

Section: Synthesis Purification Stabilitymentioning

confidence: 99%

“…The thermal, chemical, and optical stability of PEF complexes have been investigated several times. [54][55][56][57] Thermal decomposition sets in above 130 − 150 °C; the thermal stability is thus sufficient for safe handling at room temperature and even allows chemical reactions to occur under reflux in toluene. It can be increased by encapsulation into carbon nanotubes.…”

Section: Synthesis Purification Stabilitymentioning

confidence: 99%

Spin Quantum Computing with Endohedral Fullerenes

Harneit

2017

Nanostructure Science and Technology

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Enhanced thermal stability and spin-lattice relaxation rate of N@C60inside carbon nanotubes

Cited by 20 publications

References 32 publications

Carbon Nanotubes as Containers

Carbon Nanotubes as Containers

Spin relaxation times of single-wall carbon nanotubes

Spin Quantum Computing with Endohedral Fullerenes

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