Low-temperature orientational ordering and possible domain structures in C60 fullerite

被引:23
作者
Loktev, VM
Pogorelov, YG
Khalack, JN
机构
[1] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, UA-03143 Kiev 143, Ukraine
[2] Univ Porto, Ctr Fis Porto, P-4169007 Porto, Portugal
关键词
D O I
10.1063/1.1374727
中图分类号
O59 [应用物理学];
学科分类号
摘要
Based on a simple model for the ordering of hexagons on a square planar lattice, an attempt is made to consider the possible structure of C-60 fullerite in its low-temperature phase. It is shown that hexagons representing fullerenes oriented along the C-3 axes of the sc lattice can be ordered into an ideal structure with four nonequivalent molecules in the unit cell. Then the energy degeneracy for the rotation of each hexagon by pi /3 around its C-3 axis leaves the translational and orientational order in this structure but leads to a random distribution of pi /3 rotations and hence to an "averaged" unit cell with two molecules. However, the most relevant structural defects are not these intrinsic "misorientations" but some walls between domains with different sequences of the above-mentioned two (nonideal) sublattices. Numerical estimates are made for the anisotropic intermolecular potential, showing that the anisotropy is noticeably smaller for molecules in walls than in domains. (C) 2001 American Institute of Physics.
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页码:397 / 403
页数:7
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共 19 条
  • [1] Negative thermal expansion of fullerite C-60 at liquid helium temperatures
    Aleksandrovskii, AN
    Eselson, VB
    Manzhelii, VG
    Udovidchenko, BG
    Soldatov, AV
    Sundqvist, B
    [J]. LOW TEMPERATURE PHYSICS, 1997, 23 (11) : 943 - 946
  • [2] Thermal expansion of single-crystal fullerite C60 at liquid-helium temperatures
    Aleksandrovskii, AN
    Esel'son, VB
    Manzhelii, VG
    Udovidchenko, BG
    Soldatov, A
    Sundqvist, B
    [J]. LOW TEMPERATURE PHYSICS, 2000, 26 (01) : 75 - 80
  • [3] PHYSICS OF MAGNETIC DOMAINS
    BARYAKHTAR, VG
    BOGDANOV, AN
    YABLONSKII, DA
    [J]. USPEKHI FIZICHESKIKH NAUK, 1988, 156 (01): : 47 - 92
  • [4] STRUCTURAL PHASE-TRANSITIONS IN THE FULLERENE C-60
    DAVID, WIF
    IBBERSON, RM
    DENNIS, TJS
    HARE, JP
    PRASSIDES, K
    [J]. EUROPHYSICS LETTERS, 1992, 18 (03): : 219 - 225
  • [5] Thermal conductivity of crystalline fullerite C-60 in the simple cubic phase
    Efimov, VB
    MezhovDeglin, LP
    Nikolaev, RK
    [J]. JETP LETTERS, 1997, 65 (08) : 687 - 693
  • [6] On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet
    Gomonaj, EV
    Loktev, VM
    [J]. LOW TEMPERATURE PHYSICS, 1999, 25 (07) : 520 - 526
  • [7] TRIPLET EXCITATION OF C-60 AND THE STRUCTURE OF THE CRYSTAL AT 1.2-K
    GROENEN, EJJ
    POLUEKTOV, OG
    MATSUSHITA, M
    SCHMIDT, J
    VANDERWAALS, JH
    MEIJER, G
    [J]. CHEMICAL PHYSICS LETTERS, 1992, 197 (03) : 314 - 318
  • [8] Superconductivity in fullerides
    Gunnarsson, O
    [J]. REVIEWS OF MODERN PHYSICS, 1997, 69 (02) : 575 - 606
  • [9] OPTICALLY DETECTED LIBRONS AND PHONONS IN CRYSTALLINE C-60
    HOROYSKI, PJ
    THEWALT, MLW
    [J]. PHYSICAL REVIEW B, 1993, 48 (15): : 11446 - 11449
  • [10] KUZMANY H, 2000, OPTICAL ELECT PROPER