共查询到13条相似文献,搜索用时 0 毫秒
1.
T. Sugiyama 《Molecular Crystals and Liquid Crystals》2013,570(1):655-662
Phase transitions of a quasi-one-dimensional Fermi gas are studied by the use of the renormalization group method for the fermion system without the bosonization. Intrachain backward and forward scatterings, pair electron hopping between different chains and exchange scattering of electrons in different chains are taken account of. Pair electron hopping gives rise to the singlet and triplet superconductor phase transitions. Electron exchange scattering gives rise to the spin density wave and charge density wave transitions. Calculation is made by the use of the one-dimensional dispersion. Following Menyhárd's method (Ref. 1) for the model with interchain backward scattering only, the change of the fluctuation from the one-dimensional region to the three-dimensional region is described. The transition temperatures are given by the bare couplings at high temperatures. 相似文献
2.
Nobuyuki Kobayashi Shoji Nitta Hitoe Habuchi Takuya Yasui Takashi Itoh Shuichi Nonomura 《Molecular Crystals and Liquid Crystals》2013,570(1):781-786
Abstract C60 molecules were embedded in the pores of a zeolite FSM-16 by using a liquid phase method. The shift of photoluminescence spectra of C60 solid embedded in FSM-16 was discussed using data of ESR, PDS and SAXS. 相似文献
3.
A. Fournel C. More G. Roger J. P. Sorbier J. M. Delrieu D. Jerome 《Molecular Crystals and Liquid Crystals》2013,570(1):617-626
Electron tunnelling data in (TMTSF)2 X-GaSb Schottky barriers support the idea that strong superconducting fluctuations exist in quasi-one-dimensional (TMTSF)2X up to temperatures which are about one order or magnitude higher than the 3-D ordering critical temperature. Other tunnelling data tend to indicate that stabilization of superconductivity is possible at high temperature via chain cross-linking. 相似文献
4.
Shugo Suzuki Shinìchi Higai Nobutada Nagai Kenji Nakao 《Molecular Crystals and Liquid Crystals》2013,570(1):587-592
Abstract We have studied theoretically the electronic structures of a hypothetical donor-type material, (PH4)3C60, and a hypothetical acceptor-type material, (ClO4)3C60 from first principles by using a full-potential linear-combination-of-atomic-orbitals method based on the density-functional theory within the local-density approximation. It is found that the charge transfer from the PH4 molecules to the C60 molecules is perfect while the charge transfer from the ClO4 molecules to the C60 molecules is not perfect. We compare the latter result with the electronic structures of two typical acceptor-type organic conductors, (TMTSF)2ClO4 and (TMTSF)2PF6, and discuss the differences. 相似文献
5.
Mototada Kobayashi Toshifumi Hara Kenichi Shiota Yuichi Akahama Haruki Kawamura Youichi Murakami 《Molecular Crystals and Liquid Crystals》2013,570(1):611-616
Abstract X-ray diffraction and magnetic-susceptibility measurements have been carried out for single phase KxC70 (x=1, 3, 4, 6 and 9) compounds synthesized by heating stoichiometric amount of K9C70 and C70. The x-ray diffraction profiles show no structural transition down to 10K. The fairly large temperature-independent paramagnetic contribution was observed in x=3 and 4. The electrical resistivity has been measured for K evaporated C70 film with increasing K thickness. Two resistivity minima were observed at x=1 and 4. 相似文献
6.
J. Molenda I. Nowak L. Jedynak J. Marzec A. Stokłosa 《Molecular Crystals and Liquid Crystals》2013,570(2):199-204
Abstract Electrical conductivity and thermoelectric power measurements (77–300K) of both the pure and electrochemically doped with lithium Bi2Sr2CaCu2O8 system, are presented. Clear correlation between transport and electrochemical properties of LixBi2Sr2CaCu2O8 was shown. 相似文献
7.
Jun Onoe Tomonobu Nakayama Aiko Nakao Yuichi Hashi Keivan Esfarjani Yoshiyuki Kawazoe 《Molecular Crystals and Liquid Crystals》2013,570(1):689-694
Abstract The nano-structure of C60 photopolymers has been investigated using in situ Fourier-Transform Infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). The FTTR and XPS studies revealed that the C60 pholopolymer has a cross-linking via a [2+2] cycloaddition four-membered ring and formed a 2D rhombohedral structure when the polymerization was saturated. Using STM, we have successfully observed the direct real-space imaging of the C60 dimers and trimers in a C60 monolayer supported on a clean semiconductor surface. 相似文献
8.
Abstract [Na(H2O)2(C18H15O6SO3)]2 was synthesized by sulfated 5-hydroxy-6,7,4′-trimethoxyisoflavone with concentrated sulfuric acid. Single-crystal X-ray diffraction
study indicates that it is a dimeric centrosymmetric species. The coordination polyhedron of each Na(I) atom exhibits a distorted
trigonal bipyramidal geometry. The dimeric units are linked by intermolecular hydrogen bonds C–H⋯π, C–H⋯O and O–H⋯O to result
in a three-dimensional framework.
Graphical Abstract [Na(H2O)2(C18H15O6SO3)]2 was synthesized by sulfated 5-hydroxy-6,7,4′-trimethoxyisoflavone with concentrated sulfuric acid. The coordination polyhedron
of each Na(I) atom exhibits a distorted trigonal bipyramidal geometry. The dimeric centrosymmetric units are linked by intermolecular
hydrogen bonds C–H⋯π, C–H⋯O and O–H⋯O to result in a three-dimensional framework.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
9.
G. C. Das M. B. Hursthouse K. M. A. Malik M. M. Rahman M. T. Rahman T. Olsson 《Journal of chemical crystallography》1994,24(8):511-515
1,3,5-triphenyl-1,5-pentanedione, C23H20O2, has been prepared and characterized by spectroscopic methods and single crystal X-ray analysis. Crystals are monoclinic, space groupP21/n, a=28.124(4),b=5.997(1),c=10.434(1)Å, -98.42(1)Å,Z=4. The structure has been refined to a finalR-value of 0.040 for 1625 reflections withF
o>3(F
o). The compound contains the two carbonyl groups in a mutuallycis arrangement. 相似文献
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11.
The growth of C60 nanowhiskers (C60NWs) prepared by a modified liquid–liquid interfacial precipitation method is investigated, focusing on the effect of solvent ratio and water content in the C60–toluene–isopropyl alcohol (IPA) solution system. The precipitation of C60NWs was markedly influenced by the solvent ratio of toluene to IPA, and the C60NWs were found to grow longer above a critical diameter (Dc), which depends on the solvent ratio. The addition of a small amount of H2O to the C60–toluene–IPA solution promoted the growth of C60NWs. This catalytic effect of water on the growth of C60NWs was confirmed also by the experiment using heavy water (D2O) and by the decrease of growth activation energy of C60NWs with increase of H2O content in the C60–toluene–IPA solution. 相似文献
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13.
The spin Hamiltonian parameters (g factors g∥, g⊥ and the hyperfine structure constants A∥, A⊥) for the Cu2+ centers in the lithium potassium borate (LKB) glasses xLi2O·(30 − x)·K2O·70B2O3 (0 ≤ x ≤ 25) were theoretically studied using the high-order perturbation formulas of these parameters for a 3d9 ion in a tetragonally elongated octahedron. The [CuO6]10− clusters in the LKB glasses are found to suffer the relative elongations of about 3% along the tetragonal axis due to the Jahn-Teller effect. The concentration dependences of the g factors are illustrated by the approximately linear decrease of the cubic field parameter Dq as well as the increases of the covalency factor N and the relative elongation ratio ρ due to the slight expansion of the cell volume or bond lengths with increasing the Li2O concentration x. Meanwhile, the slow non-linear increases of the hyperfine structure constants are described as the rough exponential increase of the core polarization constant κ with x due to the increase of the tetragonality of the systems. The theoretical spin Hamiltonian parameters and their concentration dependences show good agreement with the experimental data. To evaluate validity and applicability of the present theoretical model and formulas, the EPR results of the Cu2+ centers in similar lithium sodium borate (LNB) xLi2O·(30 − x)·Na2O·70B2O3 (5 ≤ x ≤ 25 mol%) glasses are also analyzed and compared with those in the LKB systems using the uniform model and formulas. 相似文献