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Digitale Medien

Morphology and orientational disorder of C70 single crystals (1995)

Jiang, L. ; Li, J. ; Nagahara, L. A. ; [weitere]

Springer

Applied physics 61 (1995), S. 17-21

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ISSN: 1432-0630

Schlagwort(e): 68.35 ; 81.10

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01538204

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Digitale Medien

Influence of doping on the electronic structure of (La, Sr)2CuO4 (1994)

Howell, R. H. ; Sterne, P. A. ; Fluss, M. J. ; [weitere]

Springer

Journal of superconductivity 7 (1994), S. 169-173

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ISSN: 1572-9605

Schlagwort(e): La2−x Sr x CuO4 ; positron annihilation ; ACAR ; Fermi surface ; Sr doping ; electronic structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00730389

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