Conductance and EPR study of the endohedral fullerene Li@C60

Vladimir Popok; I.I. Azarko; A.V. Gromov; M. Jönsson; A. Lassesson; Eleanor E.B. Campbell

doi:10.1016/j.ssc.2004.12.014

Conductance and EPR study of the endohedral fullerene Li@C60

Vladimir Popok, I.I. Azarko, A.V. Gromov, M. Jönsson, A. Lassesson, Eleanor E.B. Campbell

Research output: Contribution to journal › Journal article › Research › peer-review

33 Citations (Scopus)

Abstract

Thin films and bulk samples of endohedral fullerenes Li@C60 are studied using current-voltage (I-V) measurements and electron paramagnetic resonance (EPR). Electrical measurements show a linear behaviour for the I-V curves and give an average resistivity of ca. 1.5 kOhm.cm for thin Li@C60 films deposited in vacuum, four orders of magnitude lower than C60 samples. A drastic effect on the conductance, lowering it to the values typical for C60, is observed when the Li@C60 samples are exposed to ambient atmosphere. No additional paramagnetic centres (PCs) are found for the Li@C60 compared to C60 that can be related to the formation of dimers or trimers of the endohedral fullerene molecules. However, the presence of the Li atoms in the fullerene cages contributes to a change of the spin-spin and spin-lattice relaxation times. The spin-lattice relaxation time becomes 4 orders of magnitude longer compared to the spin-spin relaxation time.

Original language	English
Journal	Solid State Communications
Volume	133
Issue number	8
Pages (from-to)	499–503
Number of pages	4
ISSN	0038-1098
DOIs	https://doi.org/10.1016/j.ssc.2004.12.014
Publication status	Published - Feb 2005
Externally published	Yes

Keywords

fullerenes
Electronic transport
electron paramagnetic resonance

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title = "Conductance and EPR study of the endohedral fullerene Li@C60",

abstract = "Thin films and bulk samples of endohedral fullerenes Li@C60 are studied using current-voltage (I-V) measurements and electron paramagnetic resonance (EPR). Electrical measurements show a linear behaviour for the I-V curves and give an average resistivity of ca. 1.5 kOhm.cm for thin Li@C60 films deposited in vacuum, four orders of magnitude lower than C60 samples. A drastic effect on the conductance, lowering it to the values typical for C60, is observed when the Li@C60 samples are exposed to ambient atmosphere. No additional paramagnetic centres (PCs) are found for the Li@C60 compared to C60 that can be related to the formation of dimers or trimers of the endohedral fullerene molecules. However, the presence of the Li atoms in the fullerene cages contributes to a change of the spin-spin and spin-lattice relaxation times. The spin-lattice relaxation time becomes 4 orders of magnitude longer compared to the spin-spin relaxation time.",

keywords = "fullerenes, Electronic transport , electron paramagnetic resonance",

author = "Vladimir Popok and I.I. Azarko and A.V. Gromov and M. J{\"o}nsson and A. Lassesson and Campbell, {Eleanor E.B.}",

year = "2005",

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doi = "10.1016/j.ssc.2004.12.014",

language = "English",

volume = "133",

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journal = "Solid State Communications",

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TY - JOUR

T1 - Conductance and EPR study of the endohedral fullerene Li@C60

AU - Popok, Vladimir

AU - Azarko, I.I.

AU - Gromov, A.V.

AU - Jönsson, M.

AU - Lassesson, A.

AU - Campbell, Eleanor E.B.

PY - 2005/2

Y1 - 2005/2

N2 - Thin films and bulk samples of endohedral fullerenes Li@C60 are studied using current-voltage (I-V) measurements and electron paramagnetic resonance (EPR). Electrical measurements show a linear behaviour for the I-V curves and give an average resistivity of ca. 1.5 kOhm.cm for thin Li@C60 films deposited in vacuum, four orders of magnitude lower than C60 samples. A drastic effect on the conductance, lowering it to the values typical for C60, is observed when the Li@C60 samples are exposed to ambient atmosphere. No additional paramagnetic centres (PCs) are found for the Li@C60 compared to C60 that can be related to the formation of dimers or trimers of the endohedral fullerene molecules. However, the presence of the Li atoms in the fullerene cages contributes to a change of the spin-spin and spin-lattice relaxation times. The spin-lattice relaxation time becomes 4 orders of magnitude longer compared to the spin-spin relaxation time.

AB - Thin films and bulk samples of endohedral fullerenes Li@C60 are studied using current-voltage (I-V) measurements and electron paramagnetic resonance (EPR). Electrical measurements show a linear behaviour for the I-V curves and give an average resistivity of ca. 1.5 kOhm.cm for thin Li@C60 films deposited in vacuum, four orders of magnitude lower than C60 samples. A drastic effect on the conductance, lowering it to the values typical for C60, is observed when the Li@C60 samples are exposed to ambient atmosphere. No additional paramagnetic centres (PCs) are found for the Li@C60 compared to C60 that can be related to the formation of dimers or trimers of the endohedral fullerene molecules. However, the presence of the Li atoms in the fullerene cages contributes to a change of the spin-spin and spin-lattice relaxation times. The spin-lattice relaxation time becomes 4 orders of magnitude longer compared to the spin-spin relaxation time.

KW - fullerenes

KW - Electronic transport

KW - electron paramagnetic resonance

U2 - 10.1016/j.ssc.2004.12.014

DO - 10.1016/j.ssc.2004.12.014

M3 - Journal article

SN - 0038-1098

VL - 133

SP - 499

EP - 503

JO - Solid State Communications

JF - Solid State Communications

IS - 8

ER -

Conductance and EPR study of the endohedral fullerene Li@C60

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Keywords

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