Testing the Elliott-Yafet spin-relaxation mechanism in KC<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>8</mml:mn></mml:msub></mml:math>: A model system of biased graphene

Fábián, Gábor; Dóra, Balázs; Antal, Ágnes; Szolnoki, Lénárd; Korecz, L.; Rockenbauer, Antal; Nemes, N. M.; Forró, Lászlø; Simón, F.

doi:10.1103/physrevb.85.235405

Cited by 15 publications

(24 citation statements)

References 44 publications

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“…The mean value of the linewidth is

1.28

mT, which is in a good agreement with the literature results:

1.43

mT ,

1.14

mT for

B ∥ c

and

1.26

mT for

B ⊥ c

(),

1.2

mT for

B ∥ c

, and

1.3

mT for

B ⊥ c

(). This agreement confirms that the sample is indeed the stage‐I KC

_{8}

in agreement with the visual identification.…”

Section: Electron Spin Resonance Spectroscopy Resultssupporting

confidence: 91%

“…The temperature was held at

250^{\circ}

C with a gradient of

5^{\circ}

C during the 2‐day long process. Stage‐I stoichiometry was identified by the golden‐yellow color of the samples and by ESR line shape and linewidth . A photograph of the final product can be seen in the inset of Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Alkali atom intercalated graphite re‐emerged as a model system of graphene: for example, the stage‐I LiC

_{6}

or AC

_{8}

=

K, Rb, or Cs) is a model system of strongly chemically doped mono‐layer graphene as the presence of alkali atoms decouples the graphene sheets in graphite and also rearranges the stacking from the conventional AB (or Bernal) stacking to AA (). It was shown from a temperature dependent electron spin resonance (ESR) study for stage‐I graphite () that the spin‐relaxation time can be explained by the conventional Elliott–Yafet theory of spin‐relaxation of metals with inversion symmetry.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic Elliott–Yafet theory and application to KC₈ potassium intercalated graphite

Márkus

Szolnoki

Iván

et al. 2016

Physica Status Solidi (b)

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We report electron spin resonance (ESR) measurements on stage‐I potassium intercalated graphite (KC8). Angular dependent measurements show that the spin–lattice relaxation time is longer when the magnetic field is perpendicular to the graphene layer as compared to when the magnetic field is in the plane. This anisotropy is analyzed in the framework of the Elliott–Yafet theory of spin‐relaxation in metals. The analysis considers an anisotropic spin–orbit Hamiltonian and the first order perturbative treatment of Elliott is reproduced for this model Hamiltonian. The result provides an experimental input for the first‐principles theories of spin–orbit interaction in layered carbon and thus to a better understanding of spin‐relaxation phenomena in graphene and in other layered materials as well.

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“…The mean value of the linewidth is

1.28

mT, which is in a good agreement with the literature results:

1.43

mT ,

1.14

mT for

B ∥ c

and

1.26

mT for

B ⊥ c

(),

1.2

mT for

B ∥ c

, and

1.3

mT for

B ⊥ c

(). This agreement confirms that the sample is indeed the stage‐I KC

_{8}

in agreement with the visual identification.…”

Section: Electron Spin Resonance Spectroscopy Resultssupporting

confidence: 91%

“…The temperature was held at

250^{\circ}

C with a gradient of

5^{\circ}

Section: Methodsmentioning

confidence: 99%

“…Alkali atom intercalated graphite re‐emerged as a model system of graphene: for example, the stage‐I LiC

_{6}

or AC

_{8}

=

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic Elliott–Yafet theory and application to KC₈ potassium intercalated graphite

Márkus

Szolnoki

Iván

et al. 2016

Physica Status Solidi (b)

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“…Here, it is worth to note that charge neutral bulk graphite also presents a similar line with a linewidth of ≈0.29 and ≈0.51 mT for

B ⊥ c

and

B ∥ c

, respectively . Since the width is different for the intercalated species: ≈0.26 mT for Li and ≈1.29 mT for K, in a good agreement with previous literature values, thus, a successful bulk intercalation (at least down to the skin‐depth, about 10 μ) is identified. Here, no angular‐dependent measurements can be made, because the boiling ammonia makes the surface curly and ripply.…”

Section: Intercalated Hopg Prepared By the Alkali–ammonia Methodssupporting

confidence: 89%

Improved Alkali Intercalation of Carbonaceous Materials in Ammonia Solution

Márkus

Szirmai

Kollarics

et al. 2019

Physica Status Solidi (b)

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Alkali‐intercalated graphite compounds represent a compelling modification of carbon with significant application potential and various fundamentally important phases. The intercalation of graphite with alkali atoms (Li and K) using liquid ammonia solution as a mediating agent is reported. Alkali atoms dissolve well in liquid ammonia, which simplifies and speeds up the intercalation process, and it also avoids the high temperature formation of alkali carbides. Optical microscopy, Raman, and electron spin‐resonance spectroscopy attest that the prepared samples are highly and homogeneously intercalated to a level approaching stage‐I intercalation compounds. The method and the synthesis route may serve as a starting point for the various forms of alkali‐atom‐intercalated carbon compounds (including carbon nanotubes and graphene), which can be exploited in energy storage and further chemical modifications.

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“…They found that the Elliott-relation is valid with α1 α 2 2 ≈ 10 for alkali metals (except for Li) and for monovalent transition metals (Cu, Ag, and Au). It is interesting to note that the validity of the Elliottrelation has since been confirmed for alkali fullerides 19 and intercalated graphite 20 . Deviations from the Elliott-relation for polyvalent metals (such as Mg and Al) was explained by Fabian and Sarma by considering the unique details of the band structure where the SOC is enhanced, which is known as the "hot-spot" model 21,22 .…”

Section: Elliott Showedmentioning

confidence: 90%

Empirical Monod-Beuneu relation of spin relaxation revisited for elemental metals

et al. 2014

Self Cite

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Monod and Beuneu [Monod and Beuneu, Phys. Rev. B 19, 911 (1979)] established the validity of the ElliottYafet theory for elemental metals through correlating the experimental electron spin resonance line-width with the so-called spin-orbit admixture coefficients and the momentum-relaxation theory. The spin-orbit admixture coefficients data were based on atomic spin-orbit splitting. We highlight two shortcomings of the previous description: i) the momentum-relaxation involves the Debye temperature and the electron-phonon coupling whose variation among the elemental metals was neglected, ii) the Elliott-Yafet theory involves matrix elements of the spin-orbit coupling (SOC), which are however not identical to the SOC induced energy splitting of the atomic levels, even though the two have similar magnitudes. We obtain the empirical spin-orbit admixture parameters for the alkali metals by considering the proper description of the momentum relaxation theory. In addition, we present a model calculation which highlights the difference between the SOC matrix element and energy splitting.

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Testing the Elliott-Yafet spin-relaxation mechanism in KC8: A model system of biased graphene

Cited by 15 publications

References 44 publications

Anisotropic Elliott–Yafet theory and application to KC₈ potassium intercalated graphite

Anisotropic Elliott–Yafet theory and application to KC₈ potassium intercalated graphite

Improved Alkali Intercalation of Carbonaceous Materials in Ammonia Solution

Empirical Monod-Beuneu relation of spin relaxation revisited for elemental metals

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Testing the Elliott-Yafet spin-relaxation mechanism in KC8: A model system of biased graphene

Cited by 15 publications

References 44 publications

Anisotropic Elliott–Yafet theory and application to KC8 potassium intercalated graphite

Anisotropic Elliott–Yafet theory and application to KC8 potassium intercalated graphite

Improved Alkali Intercalation of Carbonaceous Materials in Ammonia Solution

Empirical Monod-Beuneu relation of spin relaxation revisited for elemental metals

Contact Info

Product

Resources

About

Anisotropic Elliott–Yafet theory and application to KC₈ potassium intercalated graphite

Anisotropic Elliott–Yafet theory and application to KC₈ potassium intercalated graphite