| Tartalom: |
http://real.mtak.hu/6069/ |
| Archívum: |
MTA Könyvtár |
| Gyűjtemény: |
Status = Published
Type = Article
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| Cím: |
Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A(4)C(60) (A = K, Rb, Cs)
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| Létrehozó: |
Klupp, Gyöngyi
Kamarás, Katalin
Nemes, N. M.
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| Kiadó: |
American Physical Society
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| Dátum: |
2006
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| Téma: |
QC Physics / fizika
QC06 Physics of condensed matter / szilárdtestfizika
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| Tartalmi leírás: |
We report the temperature dependent mid- and near-infrared
spectra of
K4C60, Rb4C60, and Cs4C60. The splitting of the vibrational and
electronic transitions indicates a molecular symmetry change of
C-60(4-) which brings the fulleride anion from D-2h to either a
D-3d or
a D-5d distortion. In contrast to Cs4C60, low temperature
neutron
diffraction measurements did not reveal a structural phase
transition
in either K4C60 and Rb4C60. This proves that the molecular
transition
is driven by the molecular Jahn-Teller effect, which overrides
the
distorting potential field of the surrounding cations at high
temperature. In K4C60 and Rb4C60 we suggest a transition from a
static
to a dynamic Jahn-Teller state without changing the average
structure.
We studied the librations of these two fullerides by temperature
dependent inelastic neutron scattering and conclude that both
pseudorotation and jump reorientation are present in the dynamic
Jahn-Teller state.
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| Típus: |
Article
PeerReviewed
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| Formátum: |
text
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| Azonosító: |
Klupp, Gyöngyi and Kamarás, Katalin and Nemes, N. M. (2006) Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A(4)C(60) (A = K, Rb, Cs). PHYSICAL REVIEW B CONDENSED MATTER AND MATERIALS PHYSICS, 73 (8). Paper-085415. ISSN 1098-0121
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