Raman spectroscopic study of the rare-earth fullerides Eu6-xSrxC60

被引：2

作者：

Arvanitidis, J. ^{[1
]}

Christofilos, D. ^{[2
]}

Kourouklis, G. A. ^{[2
]}

Paloumpi, A. ^{[3
]}

Papagelis, K. ^{[3
]}

Ves, S. ^{[4
]}

Iwasa, Y. ^{[5
,6
]}

Prassides, K. ^{[7
]}

机构：

[1] Technol Educ Inst Thessaloniki, Dept Appl Sci, Sindos 57400, Greece

[2] Aristotle Univ Thessaloniki, Phys Div, Sch Technol, Thessaloniki 54124, Greece

[3] Univ Patras, Dept Mat Sci, Patras 26504, Greece

[4] Aristotle Univ Thessaloniki, Dept Phys, Thessaloniki 54124, Greece

[5] Univ Tokyo, Quantum Phase Elect Ctr, Bunkyo Ku, Tokyo 1138656, Japan

[6] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

[7] Univ Durham, Dept Chem, Durham DH1 3LE, England

来源：

NANOSCALE | 2011年 / 3卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

T(1G) STATES; C-60; SCATTERING; FULLERENES; SR6C60; BA6C60;

D O I：

10.1039/c0nr00921k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present Raman spectroscopic studies of the isostructural and isoelectronic Eu6-xSrxC60 (x-0, 3, 5, 6) and Ba6C60 compounds. The Raman spectra of the Eu-based fullerides show dramatic changes compared to the pure alkaline-earth systems, including significant broadening, splitting and frequency shifts of the fivefold degenerate H-g intramolecular modes of C-60. Moreover, the A(g)(2) mode exhibits an even larger downshift and a remarkable broadening. These findings are consistent with distortions of the C-60 molecular cages and a considerable electron-phonon coupling strength-strongly enhanced in the Eu containing systems-originating from the strong orbital hybridization between the metal atom and the C-60 molecule.

引用

页码：2490 / 2493

页数：4

共 19 条

[1] Temperature-induced valence transition and associated lattice collapse in samarium fulleride [J].

Arvanitidis, J ;

Papagelis, K ;

Margadonna, S ;

Prassides, K ;

Fitch, AN .

NATURE, 2003, 425 (6958) :599-602

[2] Raman-scattering study of Ba-doped C60 with t1g states [J].

Chen, XH ;

Taga, S ;

Iwasa, Y .

PHYSICAL REVIEW B, 1999, 60 (06) :4351-4356

[3] Anomalous Raman shift in the ternary fullerides with t1g states [J].

Chen, XH ;

Takenobu, T ;

Muro, T ;

Fudo, H ;

Iwasa, Y .

PHYSICAL REVIEW B, 1999, 60 (17) :12462-12466

[4] Structure and properties of a fulleride Sm6C60 [J].

Chen, XH ;

Liu, ZS ;

Li, SY ;

Chi, DH ;

Iwasa, Y .

PHYSICAL REVIEW B, 1999, 60 (09) :6183-6186

[5] Electronic states of Ba6C60 and Sr6C60 fullerides [J].

Gogia, B ;

Kordatos, K ;

Suematsu, H ;

Tanigaki, K ;

Prassides, K .

PHYSICAL REVIEW B, 1998, 58 (03) :1077-1079

[6] Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu6-xSrxC60 -: art. no. 134431 [J].

Ishii, K ;

Fujiwara, A ;

Suematsu, H ;

Kubozono, Y .

PHYSICAL REVIEW B, 2002, 65 (13) :1-6

[7] MODE SOFTENING AND MODE STIFFENING IN C-60 DOPED WITH ALKALI-METALS [J].

JISHI, RA ;

DRESSELHAUS, MS .

PHYSICAL REVIEW B, 1992, 45 (12) :6914-6918

[8] Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A4C60 (A = K, Rb, Cs) [J].

Klupp, G ;

Kamarás, K ;

Nemes, NM ;

Brown, CM ;

Leao, J .

PHYSICAL REVIEW B, 2006, 73 (08)

[9] RAMAN-SCATTERING IN C-60 FULLERENES AND FULLERIDES [J].

KUZMANY, H ;

MATUS, M ;

BURGER, B ;

WINTER, J .

ADVANCED MATERIALS, 1994, 6 (10) :731-745

[10] Raman spectroscopy of fullerenes and fullerene-nanotube composites [J].

Kuzmany, H ;

Pfeiffer, R ;

Hulman, M ;

Kramberger, C .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2004, 362 (1824) :2375-2406

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