Pressure evolution of the structure of (NH3)K3C60

被引：14

作者：

Margadonna, S ^{[1
]}

Prassides, K

Simoda, H

Iwasa, Y

Mézouar, M

机构：

[1] Univ Sussex, Sch Chem Phys & Environm Sci, Brighton BN1 9QJ, E Sussex, England

[2] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

[3] NCSR Demokritos, Inst Sci Mat, Athens 15310, Greece

[4] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231292, Japan

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

EUROPHYSICS LETTERS | 2001年 / 56卷 / 01期

关键词：

D O I：

10.1209/epl/i2001-00481-1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The structural features of the ammoniated (NH3)K3C60 fulleride are studied by synchrotron X-ray powder diffraction as a function of pressure to 6.7 GPa. A superstructure appears at similar to1 GPa as a result of orientational ordering of both the C-60 and K+ -NH3 units ( orthorhombic symmetry, space group Fddd). The pressure evolution of the lattice constants reveals a highly compressible, strongly anisotropic structure. The centre-to-centre interfullerene separations of similar to 10.40 Angstrom in the basal plane are comparable to those in the superconducting cubic analogue, RbCs2C60 and evidently sufficiently short to drive the system superconducting, despite its low crystal symmetry.

引用

页码：61 / 66

页数：6

共 18 条

[1] Metal-insulator transition and molecular dynamics in (NH3)K3C60 [J].

Allen, KM ;

Hayes, SJ ;

Rosseinsky, MJ .

JOURNAL OF MATERIALS CHEMISTRY, 1996, 6 (08) :1445-1447

[2] Structural and electronic properties of the noncubic superconducting fullerides A′4C60 (A′= Ba, Sr) [J].

Brown, CM ;

Taga, S ;

Gogia, B ;

Kordatos, K ;

Margadonna, S ;

Prassides, K ;

Iwasa, Y ;

Tanigaki, K ;

Fitch, AN ;

Pattison, P .

PHYSICAL REVIEW LETTERS, 1999, 83 (11) :2258-2261

[3] Superconductivity in expanded fcc C603- fullerides [J].

Dahlke, P ;

Denning, MS ;

Henry, PF ;

Rosseinsky, MJ .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (49) :12352-12361

[4] Dependence of the superconducting transition temperature and lattice parameter on hydrostatic pressure for Rb3C60 [J].

Diederichs, J ;

Schilling, JS ;

Herwig, KW ;

Yelon, WB .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1997, 58 (01) :123-132

[5] Mott transition in degenerate Hubbard models: Application to doped fullerenes [J].

Gunnarsson, O ;

Koch, E ;

Martin, RM .

PHYSICAL REVIEW B, 1996, 54 (16) :11026-11029

[6] Structural phase transition in the ammoniated alkali C60 compound (NH3)K3C60 [J].

Ishii, K ;

Watanuki, T ;

Fujiwara, A ;

Suematsu, H ;

Iwasa, Y ;

Shimoda, H ;

Mitani, T ;

Nakao, H ;

Fujii, Y ;

Murakami, Y ;

Kawada, H .

PHYSICAL REVIEW B, 1999, 59 (06) :3956-3960

[7] Metal-insulator transition in ammoniated K3C60 [J].

Iwasa, Y ;

Shimoda, H ;

Palstra, TTM ;

Maniwa, Y ;

Zhou, O ;

Mitani, T .

PHYSICAL REVIEW B, 1996, 53 (14) :R8836-R8839

[8] Screening, Coulomb pseudopotentials and superconductivity in alkali-doped fullerenes [J].

Koch, E ;

Gunnarsson, O ;

Martin, RM .

PHYSICAL REVIEW LETTERS, 1999, 83 (03) :620-623

[9] DISCRIMINATION BETWEEN EQUATIONS OF STATE [J].

MACDONALD, JR ;

POWELL, DR .

JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS SECTION A-PHYSICS AND CHEMISTRY, 1971, A 75 (05) :441-+

[10]

MARGADONNA S, UNPUB PHYS REV B

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