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  • 1
    Electronic Resource
    Electronic Resource
    Morphology and orientational disorder of C70 single crystals (1995)
    Springer
    Applied physics 61 (1995), S. 17-21 
    Details
    ISSN: 1432-0630
    Keywords: 68.35 ; 81.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract C70 single crystals, free from solvent contamination, were grown via vapor phase transport technique. The (0001) face of the C70 crystal was imaged with Atomic Force Microscopy (AFM) under ambient atmosphere. Low-resolution images of a freshly prepared crystal revealed well-ordered faceted regions with multiple terraces extending over a region of several hundred square nanometers. The terraced structure in the images indicates that the crystals formed as a layer growth. In the high-resolution images, C70 molecules were resolved in a hexagonal close packed (hcp) structure with an average center-to-center distance of 10.5±0.5 Å. After one month's exposure to the ambient atmosphere, the molecules rearranged into a mixed structure consisting of hcp and face centered cubic (fcc) regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538204
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning tunnelling spectroscopy of dangling-bond wires fabricated on the Si(100)-2×1-H surface (1998)
    Springer
    Applied physics 66 (1998), S. S695 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 73.20.At; 73.61.-r; 61.16.Ch; 68.35.Bs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051224
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology and orientational disorder of C70 single crystals (1995)
    Springer
    Applied physics 61 (1995), S. 17-21 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.35 ; 81.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  C70 single crystals, free from solvent contamination, were grown via vapor phase transport technique. The (0001) face of the C70 crystal was imaged with Atomic Force Microscopy (AFM) under ambient atmosphere. Low-resolution images of a freshly prepared crystal revealed well-ordered faceted regions with multiple terraces extending over a region of several hundred square nanometers. The terraced structure in the images indicates that the crystals formed as a layer growth. In the high-resolution images, C70 molecules were resolved in a hexagonal close packed (hcp) structure with an average center-to-center distance of 10.5 ± 0.5 Å. After one month’s exposure to the ambient atmosphere, the molecules rearranged into a mixed structure consisting of hcp and face centered cubic (fcc) regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538204
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  • 4
    Electronic Resource
    Electronic Resource
    Enhancement of Friedel oscillation in the insulating phases of 1T-TaS2 and 1T-TaSe2 (1998)
    Springer
    Applied physics 66 (1998), S. S175 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.16.Ch; 61.72.Ff; 72.10.Fk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 2 and 1T-TaSe2were probed by variable temperature UHV-STM. In 1T-TaS2, which indicates a metal-Mott insulator transition at 180 K, the impurity image varied drastically depending on its electronic structure: in its metallic phase, defects were imaged as less-conducting regions with a lateral size of ∼2 nm, while in the insulating phase spherically oscillating structures were frequently found (Friedel oscillation). The dimensions of oscillation, being ∼15 nm in period and ∼1 nm in amplitude, were substantially larger than those reported in normal metals. On the other hand, the 1T-TaSe2 crystals examined here showed both metallic and insulating behavior at room temperature, depending on their surface conditions. The enhanced Friedel oscillation was encountered only on the insulating surfaces. These observations are consistent with the theoretical model proposed by Kobayashi, in which low-energy excitations with small wavenumbers play an important role in enhancing the Friedel oscillation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051125
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  • 5
    Electronic Resource
    Electronic Resource
    AFM observation of surface reconstruction of C60 single crystals (1998)
    Springer
    Applied physics 66 (1998), S. S763 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.48.+c; 68.35.-p; 68.35.Bs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 60 single crystals. The (111) and the (001) faces of C60 single crystals were illuminated with photons with energies below the band gap (generation of Frenkel-type excitons) or above the band gap. In the case of sub-band-gap illumination, reconstructed surfaces formed on the crystals. The reconstruction was represented by fringes running in the [11 ] and [0 0] directions on the (111) and (001) surfaces, respectively. As a result of supra-band-gap illumination, however, there appeared only cracks, without any fringes, which were oriented in directions characteristic of each face. The results suggest that the photo-induced surface reconstruction of C60 single crystals is induced via the recombination of Frenkel-type excitons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051238
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetostriction of HTSC single crystals (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 283-285 
    Details
    ISSN: 1572-9605
    Keywords: Magnetostriction ; pinning effect ; flux creep ; HTSC single crystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have measured the sample length change of HTSC single crystals in the superconducting state in a magnetic field. The magnetic field was applied parallel to the crystallinec-axis direction and was swept at a constant rate of 10 mT/s up to 6 T. The sample length change was measured along theab-plane direction, i.e., perpendicular to the field. We have found for the Bi2Sr2CaCu2O8 single crystals that the relative sample length change (ΔL/L) is extraordinarily large for a superconductor, on the order of 10−4. For the case of (La1−x Sr x )2CuO4, the amount of magnetostriction was not as large as for the Bi system, but the magnetostriction curves had many similarities. For both compounds, a relaxation phenomenon was observed when the field sweep was suspended at a certain field value. These observations are discussed in relation to flux line pinning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724553
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  • 7
    Electronic Resource
    Electronic Resource
    Single-crystal growth and anisotropic electrical properties of (La1− xCa x )2CaCu2O6 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 313-318 
    Details
    ISSN: 1572-9605
    Keywords: (La, Ca)2CaCu2O6, single crystal ; TSFZ technique ; oxygen HIP ; electrical anisotropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Large single crystals of (La1−x Ca x )2CaCu2O6 were synthesized by the travelling solvent floating zone (TSFZ) technique. The dimension of the grown boules was typically 4 mmφ×30 mm long with thec-axis perpendicular to the growth direction. After oxygen loading at 1080°C in 400 atm of O2, they became superconductive with a sharp transition at around 50 K. The resistivity was metallic both along thec-axis and within theab-plane, with an anisotropy ratio ofγ 2≡(ρ c/ρ ab ) ∼ 50 which is almost independent of temperature. Details of the crystal growth, heat treatment procedures, and the results of electrical and magnetic property measurements are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724560
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  • 8
    Electronic Resource
    Electronic Resource
    STM tunneling spectroscopy on high Tc superconductors (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 467-470 
    Details
    ISSN: 1572-9605
    Keywords: STM ; superconducting gap ; symmetry of order parameter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract STM tunneling spectroscopy has been performed on the bulk single crystals of BiSrCaCuO (BSCCO) and the epitaxial thin films of YBaCuO (YBCO) at cryogenic temperatures. The STM images and tunneling spectra observed on the (001) surfaces can be classified into three cases; 1) Atomic image is visible. However, the tunneling spectrum shows semiconducting or smeared superconducting gap structures, depending on the tip-sample distance. 2) Clear atomic image can not be obtained. But, the tunneling spectrum shows flat bottom region with quite low zero bias conductance. 3) Tunneling spectra demonstrate gapless behavior, independent of the tip-sample separation. These observations support the quasi-2D electronic picture in whichs-wave like 2D superconducting layers are coupled with each other through the Josephson effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722832
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  • 9
    Electronic Resource
    Electronic Resource
    Cryogenic STM/STS observation on oxide superconductors (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 349-353 
    Details
    ISSN: 1572-9605
    Keywords: Scanning tunneling microscopy ; YBa2Cu3Oy ; laser-ablated thin films ; tunneling spectroscopy ; superconducting energy gap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The topographic and electronic properties of the surfaces of (001) and (110) oriented YBa2Cu3Oy, epitaxial films have been probed by atomic resolution STM/STS at 4.2 K. The STM image on the (001) surface clearly revealed the atomic corrugation of the tetragonal lattice with an average spacing of 0.4 nm. while on the (110) surface the orthorhombic atomic lattice, corresponding to the Cu atoms of both CuO2 and CuO chain planes, was observed. The STS result on the (001) surface indicated the semiconducting nature of the terminating layer. As the tunneling tip came closer to the surface, however, the shape of the tunneling spectrum became more metallic and showed a superconducting energy gap, which seems to arise from the underlying superconducting layer. On the other hand, the tunneling spectra on the (110) surface indicated superconducting gap structures, independent of the tip-sample distance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724567
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of doping on the electronic structure of (La, Sr)2CuO4 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 169-173 
    Details
    ISSN: 1572-9605
    Keywords: La2−x Sr x CuO4 ; positron annihilation ; ACAR ; Fermi surface ; Sr doping ; electronic structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-statistics (〉4 × 108 counts), room-temperature measurements of the electron-positron momentum density of La2−x Sr x CuO4 have been performed for samples with Sr concentrations of x=0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730389
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