Summary of Research Project Results Under the JSPS FY2000
"Research for the future Program"



1.Research Institution University of Tokyo
 
2.Research Area Physical and Engineering Science
 
3.Research Field Exploratory Research on Novel Artificial Materials and Substances for Next-Generation Industries
 
4.Term of Project FY1996〜FY2000
 
5.Project Number 96P00104
 
6.Title of Project Materials Science and Microelectronics of Nanometer-Scale Materials, Fullerenes and Nanotubes

7.Projetct Leader
Name Institution,Department Title of Position
Suematsu, Hiroyoshi Graduate school of Sciences, University of Tokyo Professor

8.Core Members

Names Institution,Department Title of Position
Fujii, Yasuhiko Institute for Solid State Physics, Univ. of Tokyo Professor
Tanigaki, Katsumi Department of Material Science, Osaka City Univ. Professor
Iwasa, Hiroyoshi Japan Advanced Institute Science and Technology Associate Professor

9.Cooperating Researchers

Names Institution,Department Title of Position
Blinder Gorgia Faculty of Sciences, University of Tokyo Research Associate
Watanuki, Tetsu Faculty of Sciences, University of Tokyo Research Associate
Ishii, Kenji Faculty of Sciences, University of Tokyo Research Associate

10.Summary of Research Results

In this Project, we have studied the electronic, optical and magnetic properties of fullerene compounds and carbon nanotubes, and developed the basic research for their potential electronic devices.
Carbon nanotube is a most attractive material in the nanometer science and technology because of the unique nature of the one-dimensional (lD) macroscopic molecule. We have succeeded first the observation of the photoconduction of single-walled carbon nanotubes (SWCN) with uses of a tunable-energy laser and the lithographic technique, and showed that the SWCN can work as a lD-semiconductor with the tunable band-gap energy. We also determined the electronic band structure of SWCNs from the optical absorption spectrum. Another important progress we made is to develop a new technique of the dual-probe AFM/STM method, which enable us to observe the local conductivity and electronic structure on a single SWNT (a few nanometer in diameter). This technique provides a strong tool of electronic characterization of nanometer materials.
We have investigated the systematic studies of the superconductivity and magnetic properties of fullerene compounds, and obtained a complete diagram of Tc vs inter-molecular distance d. We also discovered new superconductors, new ferromagnetic and antiferromagnetic fullererides. In the alkaline-earth compounds of C60, the superconductivity appears only at the C60-valency of n = 8,9, and 10, in contrast to the case of alkali C60-compounds where it appears only for n = 3. This critical difference comes from the hybridization of molecular orbitals between AE-metal and fullerene. In compounds with large molecular distance d, Tc increases significantly, but the most surprising feature is the appearance of an antiferromagnetic insulator phase. We determined the magnetic phase diagram of TN vs d, which was found to be very close to that for the single-band Hubbard model. The origin of antiferromagnetism can be ascribed to the band splitting due to the reduction of the crystal symmetry at low temperatures. Another very interesting materials we discovered is a ferromagnetic rare-earth fulleride having the giant negative magnetoresistance (GMR), which shows a negative GMR of three orders of magnitude. The phenomenum can be understood in terms of the spin-dependent tunneling conduction in the ferromagnetic powder crystal sample.

11.Key Words

(1)Fullerene Compounds、(2)Carbon Nanotubes、(3)Nanometer Materials
(4)Electronic Structure、(5)Magnetic Properties、(6)Structure Transition
(7)Metal-Insulator Transition

12.References

[Reference Articles]
Author Title of Article
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Journal Volume Year Pages Concerned
Phys. Rev. Lett. 85 2000 3189-3192

Author Title of Article
C. J. Nuttall et al., Pressure dependence of magnetization of M[N(CN)2]2: Mechanism for the long range magnetic ordering
Journal Volume Year Pages Concerned
Mol. Cryst. Liq. Cryst. 343 2000 227-234

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A. Fujiwara et al., Synchrotron radiation x-ray powder diffractometer using a cylindrical imaging plate
Journal Volume Year Pages Concerned
J. Appl. Crystallogr. 33 2000 1241-1245

Author Title of Article
K. Ishii et. Al., Colosal magnetoresistance in the ferromagnetic rare earth fulleride Eu6C60
Journal Volume Year Pages Concerned
submitted to Phys. Rev. Lett.      

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A. Fujiwara et al., Gas adsorption in the inside and outside of single-walled Carbon nanotubes
Journal Volume Year Pages Concerned
submitted to Chem. Phys. Lett.      

Author Title of Article
M. Kosaka et al., Superconductivity in LixCsC60 fullerides
Journal Volume Year Pages Concerned
Phys. Rev. B59 1999 R6628-R6630

Author Title of Article
X. H. Chen et al., Raman scattering study of Ba-doped C60 with tlg states
Journal Volume Year Pages Concerned
Phys. Rev. B60 1999 4351-4356

Author Title of Article
X. H. Chen et al., Structure and properties of novel fulleride Sm6C60
Journal Volume Year Pages Concerned
Phys. Rev. B60 1999 6183-6186

Author Title of Article
X. H. Chen et al., Anomalous Raman shift in the ternary fullerides with tlg states
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Author Title of Article
S. Margadonna et al., Excess Lithium Intercalation in the Fulleride Superconductor Li3CsC60
Journal Volume Year Pages Concerned
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Author Title of Article
S. Margadonna et al., Pressure and temperature evolution of the structure of the superconducting Na2CsC60 fulleride
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Author Title of Article
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Journal Volume Year Pages Concerned
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Author Title of Article
T. Takenobu et al., Anomalous High Pressure Effect in Superconducting Fullerides
Journal Volume Year Pages Concerned
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Author Title of Article
Y. Maniwa et al., NMR studies of ammoniated NaA2C60 superconductors
Journal Volume Year Pages Concerned
Synth. Metals 103 1999 2458-2461

Author Title of Article
Y. Iwasa et al., Band Filling and Width Control in Fullerides
Journal Volume Year Pages Concerned
Synth. Metals 103 1999 2462-2465

Author Title of Article
Y. Iwasa et al., Current Issues of Intercalation and Superconductivity in Solid State Fullerenes
Journal Volume Year Pages Concerned
Fullerene Science and Technology 7 1999 587-598

Author Title of Article
S. Margadonna et al., Temperature and Pressure Dependence of Orientational Disorder and Bonding in Li2CsC60
Journal Volume Year Pages Concerned
Int. J. Inorg. Mater. 1 1999 157-163

Author Title of Article
Y. Kubozono et al., Structure and Physical properties of Cs3C60 under Ambient and High Pressures
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Proceedings of XIIIth International Winterschool on Electronic Properties of Novel Materials   1999 69-72

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S. Fujiki et al., Structure and Raman scattering of Cs3C60 under high pressure
Journal Volume Year Pages Concerned
Phys. Rev. B62 2000 5366-5369

Author Title of Article
K. Prassides et al., Powder diffraction and inelastic neutron scattering studies of the Na2RbC60 fulleride
Journal Volume Year Pages Concerned
J. Mater. Chem 10 2000 1443-1449

Author Title of Article
Z. Sun et al., Structure and Raman behavior of Sm2.75C60
Journal Volume Year Pages Concerned
J. Phys. : Condens. Matter 12 2000 8919-8926

Author Title of Article
Y. Iwasa et al., Electronic Properties of Ba-Intercalated Fullerides
Journal Volume Year Pages Concerned
Mol. Cryst. Liq. Cryst. 340 2000 583-586

Author Title of Article
T. Takenobu et al., Anomalous High Pressure Properties in Fullerene Superconductors
Journal Volume Year Pages Concerned
Mol. Cryst. Liq. Cryst. 340 2000 599-604

Author Title of Article
Y. Iwasa et al., Metal-insulator transition in ammoniated K3C60
Journal Volume Year Pages Concerned
Phys. Rev. B53 1996 R8836-R8839

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Electrochemical Society Proceedings 97-14 1997 1191-1199

Author Title of Article
C. M. Brown et al., Magnetism and Dynamics of Ammoniated K3C60
Journal Volume Year Pages Concerned
Electrochemical Society Proceedings 97-14 1997 1224-1231

Author Title of Article
S. Margadonna et al., Rotational dynamics of C60 in (ND3)K3C60
Journal Volume Year Pages Concerned
Phys. Rev. B59 1999 943-947

Author Title of Article
K. Ishii et al., Structural phase transition in ammoniated alkali C60 compound(NH3)K3C660
Journal Volume Year Pages Concerned
Phys. Rev. B59 1999 3956-3960

Author Title of Article
Y. Kubozono et al., Metal-insulator transition at 50 K in Na2C60
Journal Volume Year Pages Concerned
Phys. Rev. B59 1999 15062-15069

Author Title of Article
K. Prassides et al., Magnetic Ordering in the Ammoniated Fulleride (ND3)K3C60
Journal Volume Year Pages Concerned
J. Am. Chem. Soc. 121 1999 11227-11228

Author Title of Article
S. Margadonna et al., Rotational Tunneling of Ammonia in (NH3)K3C60
Journal Volume Year Pages Concerned
J. Chem. Phys 111 1999 10969-10973

Author Title of Article
H. Tou et al., Mott transition and antiferromagnetic ordering in intercalated -C60 superconductor
Journal Volume Year Pages Concerned
Physica B259-261 1999 868-869

Author Title of Article
H. Tou et al., Antiferromagnetic ordering in (NH3)K3C60 13C-NMR studies
Journal Volume Year Pages Concerned
Synth. Metals 103 1999 2447

Author Title of Article
K. Ishii et al., Orientational ordering of alkali ammonia clusters in ammoniated alkali fullerides, (NH3)K3C60 and (ND3)K3C60
Journal Volume Year Pages Concerned
Proceedings of XIIIth International Winterschool on Electronic Properties of Novel Materials,   1999 60-63

Author Title of Article
T. Takenobu et al., Antiferromagnetism and phase diagram in ammoniated alkali fulleride salts
Journal Volume Year Pages Concerned
Phys. Rev. 85 Lett 85 2000 381-384

Author Title of Article
F. Simon et al., Magnetic resonance in the antiferromagnetic and normal states of NH3K3C60
Journal Volume Year Pages Concerned
Phys. Rev. B61 2000 R3826-R3829

Author Title of Article
H. Tou et al., NMR evidence for Mott-Hubbard localization in (NH3)K3C60
Journal Volume Year Pages Concerned
Phys. Rev. B62 2000 R775-R778

Author Title of Article
H. Tou et al., Mott transition with antiferromagnetic ordering in ammoniated alkali C60 superconductors: NMR studies
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Physica B281&282 2000 1018-1020

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H. Ootoshi et al., Crystal Structure of Europium C60 Compounds
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Mol. Cryst. Liq. Cryst. 340 2000 571-576

Author Title of Article
K. Ishii et al., Crystal Structure and Magnetic properties of EuxSr6-xC60
Journal Volume Year Pages Concerned
Proceedings of XIVth International Winterschool on Electronic Properties of Novel Materials   in press  

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H. Nakao et al., Structure and Phase Transition of Fullerene C76 Crystal Studied by X-ray Scattering
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J. Phys. Soc. Jpn 67 1998 4117-4123

Author Title of Article
C. J. Nuttall et al., Structural and magnetic studies of the endohedral metallofullerene La@C82
Journal Volume Year Pages Concerned
Proceedings of XIIIth International Winterschool on Electronic Properties of Novel Materials   1999 115-119

Author Title of Article
T. Watanuki et al., Structural Phase Transitions of Metallofullerene La@C82 Studied by Single Crystal X-ray Diffractions
Journal Volume Year Pages Concerned
Proceedings of XIIIth International Winterschool on Electronic Properties of Novel Materials   1999 124-127

Author Title of Article
K Izumi et al., Investigation of epitaxial arrangement and electronic structure of a La@C82 film grown on an MoS2 surface
Journal Volume Year Pages Concerned
Phys. Rev. B62 2000 8281-8285

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C. J. Nuttall et al., Low-temperature bistability in the magnetic properties of solvent-including lanthanide metallofullerene crystal
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Phys. Rev. B62 2000 8592-8595

Author Title of Article
X. H. Chen et al., Synthesis, structure, and transport properties of novel fulleride A3C70 (A-Ba and Sm)
Journal Volume Year Pages Concerned
J. Am. Chem. Soc 122 2000 5729-5732

Author Title of Article
T. Takenobu et al., Synthesis and Structure of BaxC70
Journal Volume Year Pages Concerned
Mol. Cryst. Liq. Cryst. 340 2000 617-622

Author Title of Article
C. J. Nuttall et al., Structural and Magnetic Characterisation of Ce@C82
Journal Volume Year Pages Concerned
Mol. Cryst. Liq. Cryst. 340 2000 635-638

Author Title of Article
T. Watanuki et al., Structural Phase Transitions of Metallofullerene La@C82 Studied by Single Crystal X-ray Diffractions
Journal Volume Year Pages Concerned
Mol. Cryst. Liq. Cryst 340 2000 639-642

Author Title of Article
C. J. Nuttall et al., Magnetic properties of metal endohedral fullerene crystals La@C82(Cs2)1.5
Journal Volume Year Pages Concerned
Mol. Cryst. Liq. Cryst. 343 2000 235-240

Author Title of Article
K. Kmaras et al., Infrared spectra of one-and two-dimensional fullerene polymer structures: RbC60 and rhombohedral C60
Journal Volume Year Pages Concerned
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Author Title of Article
Y. Iwasa et al., Structural and spectroscopic properties of pressure-induced C70 polymers
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Appl. Phys. A64 1997 251-256

Author Title of Article
Y. Iwasa et al., High yield selective synthesis of C60 dimers
Journal Volume Year Pages Concerned
Chem. Comm.   1998 1411-1412

Author Title of Article
T. Ozaki et al., Elementary processes in pressure-induced polymerization of C60
Journal Volume Year Pages Concerned
Chem. Phys. Lett. 285 1998 289-293

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J. S. Ahn et al., Photoluminescence of confined exitons in nanoscale C60 clusters
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J. Lumin. 76&77 1998 201-205

Author Title of Article
D. Arcon et al., Electron spin resonance study of the polymeric phase of Na2RbC60
Journal Volume Year Pages Concerned
Phys. Rev. B60 1999 3856-3861

Author Title of Article
S. Margadonna et al., High pressure polymerization of the Li-intercalated fulleride Li3CsC60
Journal Volume Year Pages Concerned
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J. Arvanitidis et al., High Pressure Effects on the Raman Spectrum of CsC60 Polymer
Journal Volume Year Pages Concerned
Physica B265 1999 234-238

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A. Lappas et al., Neutron diffraction study of the polymeric structure of Na2RbC2
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J. Phys. Condens. Matter 11 1999 371-381

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K. Mizoguchi et al., ESR and heat capacity studies of phase transition in Rb1C60
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V. C. Long et al., Far-infrared vibrational properties of high-pressure high-temperature C60 polymers and the C60 dimer
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Phys. Rev. B61 2000 13191-13201

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H. Sakamoto et al., Electronic states in Rb1C60 studied by EPR under pressure: 3D Mott-Hubbard system
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Phys. Rev. B62 2000 R7691-7694

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V. C. Long et al., Far-infrared investigation of C60 dimer and High pressure-high temperature polymers
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Ferroelectrics   in press  

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Y. Iwasa et al., Formation mechanism of polymeric fullerenes
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A. Fujiwara et al., Electronic transport and magnetic properties of carbon nanotubes
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Proceedings of Xith International Winterschool on Electronic Properties of Novel Materials   1997 439-442

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A. Fujiwara et al., Magnetic-field alignment and magnetic properties of carbon nanotubes
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Proceedings of the 4th International Union of MRS International Conference in Asia   1997 73-76

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A. Fujiwara et al., Quantum interference of electrons in multi-wall carbon nanotubes
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Phys. Rev. B60 1999 13492-13496

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H. Suematsu et al., Magnetic quantum effects in carbon nanotubes
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Proceedings of 4th International Symposium on Advanced Physical Fields   1999 87-89

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A. Fujiwara et al., Electron Interference Effect in Multi-wall Carbon Nanotubes
Journal Volume Year Pages Concerned
Proceedings of XIIIth International Winterschool on Electronic Properties of Novel Materials   1999 403-406

Author Title of Article
A. Fujiwara et al., Magnetotransport of carbon nanotubes: Magnetic field induced metal-insulator transition
Journal Volume Year Pages Concerned
Physica B   in press  

Author Title of Article
Y. Maniwa et al., Anomaly of X-ray Diffraction Profile in Single-Walled Carbon Nanotubes
Journal Volume Year Pages Concerned
Jpn. J. Appl. Phys. 38 1999 L668-L670

Author Title of Article
Y. Maniwa et al., Gas Storage in Single-Walled Carbon Nanotubes
Journal Volume Year Pages Concerned
: Mol. Cryst. Liq. Cryst. 340 2000 671-676

Author Title of Article
T. Ozaki et al., Stiffness of single walled carbon nanotubes under large strain
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Phys. Rev. Lett. 84 2000 1712-1715

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R. F. Herrmann et al., Superconductivity in Silicon based Barium-inclusion Clathrates
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H. Okui et al., Structural, Lattice-Dynamical and Magnetic Properties of Alkali-Metal Intercalated Vermiculite
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[Reference Books]
Author Title of Book
K. Tanigaki Recent advances and Topics of solid state Physics and Chemistry of Fullerenes
Publisher Year Pages
aper. Electrochemical Society Symposium Book 1997 222

Author Title of Book
Y. Iwasa Fullerene Superconductors
Publisher Year Pages
In Handbook of Supercondocting Materials in press  


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