EPR and microwave absorption of alkali metal-doped fullerene superconductors

Byszewski, P.; Stankowski, J.; Трыбула, З.; Kempiński, W.; Żuk, T.

doi:10.1016/0022-2860(92)80014-9

Cited by 20 publications

(19 citation statements)

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“…1) of g N = 2.0024 and the w i d t h 2 Δ Β N1 s = 0 . 5 Gs a t t r i b u t e d t o ( C 6 0 ) + i o n -r a d i c a l a n d a w i d e ( W) l i n eΒ o f gW = 2.0016 and the width 2ΔΒW1s = 7 Gs attributed to (C60 )y ion-radical in the Rb-C60 complex [1]. When temperature was decreased below T = 120 K, line.…”

Section: Methodsmentioning

confidence: 88%

“…So far, literature reports have concerned large concentrations of alkali metal fullerites Mex C60 where x = 2, 3, 4, 5 [1][2][3][4][5]. This paper presents the results of EPR investigation of C60 spectra and conclusions connected with the process of charge transfer from the alkali metal to the fullerene ball in samples of small concentration of admixtured metal Me = K or Rb.…”

Section: Anion Radicals (C60)y-with Valence Y Occur As Complexes M Ementioning

confidence: 91%

“…The samples were prepared by the method similar to that described in [1]. The soot to synthesize fullerene were generated by the contact between graphite electrodes in the reaction chamber filled with helium up to 0.2 atm.…”

Section: Methodsmentioning

confidence: 99%

“…The holes (h) induced by ionization of fullerene molecule (C6 0 ) 1 + or trapped (t) electrons on C60 ball due to anion radical (C60) 1-. These centers present at small concentrations in pure fullerene samples [1] and their EPR spectra weakly depend on temperature. For both centers the EPR lines are narrow till the lowest temperatures (4.2 K) but g-faction are different which allows to distinguish them clearly: the former are of gh ≥ g0 = 2.0023 while those of the latter are characterized by gt ≤ g 0 , in the vicinity of g = 2.0000.…”

Section: Introductionmentioning

confidence: 99%

“…EPR investigation of fullerene Ch0 samples proved the presence of two kinds of paramagnetic centers [1,2] which differ essentially in their temperature behavior:…”

Section: Introductionmentioning

confidence: 99%

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Free Radicals in K and Rb Admixtured Fullerene C₆₀

et al. 1993

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Molecules of C60 form Van der Waals type crystals. The observations reported here concern EPR investigations of such C60 samples with only a slight amount of Rb or K. Detected defects are (C60)+ or (C60 ) ion-radicals. A hole (h) or trapped electron (t) are localized on one fullerene ball. In the case of potassium fullerites C60:K the line shape of EPR signal was of the Dysonian form which is characteristic of conducting electrons in metal. The EPR lines of holes (C60)+ are characterized by gh ≥ g0 whereas for electrons g, is below the value g0 = 2.0023 characteristic of a free electron (gt ≤ g0). The EPR linewidth 2ΔBh1s of the (C60)+ weakly increased with decreasing temperature whereas the EPR linewidth attributed to the electron 2ΔBt1s significantly decreases with decreasing temperature. The C60 :K sample reached superconducting phase below T^ = 11 K which is significantly less than T, = 16.5 K observed for K C60 where 2 ≤ x ≤ 4.

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Section: Methodsmentioning

confidence: 88%

Section: Anion Radicals (C60)y-with Valence Y Occur As Complexes M Ementioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…EPR investigation of fullerene Ch0 samples proved the presence of two kinds of paramagnetic centers [1,2] which differ essentially in their temperature behavior:…”

Section: Introductionmentioning

confidence: 99%

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Free Radicals in K and Rb Admixtured Fullerene C₆₀

et al. 1993

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Electron Paramagnetic Resonance in Me_xC₆₀ Fullerites for Me = K and Rb

Stankowski

Byszewski

Kempiński

et al. 1993

Physica Status Solidi (b)

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EPR studies of superconducting fullerites Me&, (Me = K and Rb) are performed for temperatures ranging frpm 4 to 300 K and compositions, of x = 2 to 5. A paramagnetic center is an ion radical fullerene C,, which may occur as a cation C;, or anion Cyh6 of different valency. The EPR signal of C;, weakly depends on temperature whereas the signal of C& in a complex is strongly dependent both on temperature and composition. A model of a paramagnetic center related to a wandering electron (hole) localized on the C,, fullerene ball is presented.

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