Fluctuating field model for conduction electron spin resonance in graphite

Huber, D. L.; Urbano, R. R.; Sercheli, M. S.; Rettori, C.

doi:10.1103/physrevb.70.125417

Cited by 30 publications

(26 citation statements)

References 18 publications

(21 reference statements)

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“…The spin susceptibility shows the characteristics expected from band structure calculations, that is x $ T. The finite intercept of x might indicate a nonnegligible presence of ultrathin graphitic flakes in our sample, although the overall characteristics (x, DH and g-factor) are markedly different from the properties of graphite [16].…”

Section: Discussionmentioning

confidence: 86%

Towards electron spin resonance of mechanically exfoliated graphene

Ćirić

Sienkiewicz

Náfrádi

et al. 2009

Physica Status Solidi (b)

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We have attempted to prepare graphene samples by mechanical exfoliation of HOPG (highly oriented pyrolytic graphite) using scotch tape. Random testing of the flakes by AFM has shown in majority single layer graphene. Nevertheless, the presence of ultrathine graphite cannot be excluded in the large assembly of flakes needed for electron spin resonance (ESR) measurements. Graphene flakes sitting on ESR-silent scotch tapes were stacked parallel to form a multilayer sandwich. The ESR measurements performed in the 4-300 K range yielded narrow Lorentzian line.The spin susceptibility was decreasing linearly with decreasing temperature as expected for the conical band dispersion of graphene. Below 70 K the spin susceptibility started to deviate from the linear temperature dependence and a Curie-like behavior was observed. This contribution to the susceptibility is due to the existence of defects or impurities, which are in strong exchange coupling limit with conduction electrons. The temperature dependence of the linewidth suggests Elliott's mechanism for spin relaxation in graphene flakes.

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Section: Discussionmentioning

confidence: 86%

Towards electron spin resonance of mechanically exfoliated graphene

Ćirić

Sienkiewicz

Náfrádi

et al. 2009

Physica Status Solidi (b)

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“…The crystal structure of the AlB 2 and MgB 2 compounds are reminiscent of that of the GIC, except for the eventual mobility of the intercalated species in GIC [7]. In spite of these similarities, the observed g-value anisotropy of graphite [8,16] is absent in AlB 2 , MgB 2 and also in GIC.…”

Section: Discussionmentioning

confidence: 90%

Conduction electron spin resonance in AlB₂

Holanda¹,

Mendonça-Ferreira²,

Ribeiro³

et al. 2013

J. Phys.: Condens. Matter

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This work reports on electron spin resonance experiments in oriented single crystals of the hexagonal AlB 2 diboride compound (P6/mmm, D16h structure) which display conduction electron spin resonance. The X-band electron spin resonance spectra showed a metallic Dysonian resonance with g-value and intensity independent of temperature. The thermal broadening of the anisotropic electron spin resonance linewidth H tracks the T-dependence of the electrical resistivity below T 100 K. These results confirm the observation of a conduction electron spin resonance in AlB 2 and are discussed in comparison with other boride compounds. Based on our main findings for AlB 2 and the calculated electronic structure of similar layered honeycomb-like structures, we conclude that any array of covalent B-B layers potentially results in a conduction electron spin resonance signal. This observation may shed new light on the nature of the non-trivial conduction electron spin resonance-like signals of complex f-electron systems such as β-YbAlB 4 .

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“…Earlier reports of ESR studies on graphite revealed a dependence of the g-factor on temperature as well as the external magnetic field orientation relative to the (out of plane) c-axis [34,35]. These studies indicate that when B ⊥ c-axis, g ⊥ is essentially constant with respect to temperature and very close to that of the free electron, with g ⊥ = 2.0023.…”

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confidence: 72%