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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

Resistivity measurements and the vortex phase diagram of Bi2Sr2CaCu2O y (1996)

Ikuta, H. ; Watauchi, S. ; Shimoyama, J. ; [weitere]

Springer

Journal of low temperature physics 105 (1996), S. 1189-1194

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ISSN: 1573-7357

Schlagwort(e): 74.60.Ec ; 74.60.Ge ; 74.72.Hs

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We have measured the temperature dependence of the ab-plane resistivity on Bi2Sr2CaCu2Oy single crystals with high sensitivity. A clear resistivity drop was observed when a relatively low magnetic field was applied, which is attributed to the melting transition of the flux line lattice. Three crystals with different carrier doping level were investigated and the phase diagrams are determined from the resistivity measurements. It is also shown that the phase transition temperature depends strongly on the angle between the magnetic field and the crystallographic c-axis direction, reflecting the large anisotropy of Bi2Sr2CaCu2Oy.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00753861

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Digitale Medien

Magnetization curves of (La1−x Sr x )2CuO4−δ single crystals as functions ofx and δ (1996)

Sasagawa, T. ; Okuya, M. ; Shimoyama, J. ; [weitere]

Springer

Journal of low temperature physics 105 (1996), S. 1201-1206

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ISSN: 1573-7357

Schlagwort(e): 74.30.Ci ; 74.60.Ge

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The second peak effect in magnetization curves for overdoped (La1−xSrx)CuO4−δ single crystals was examined by means of systematic variations of Sr content x and oxygen deficiency δ. Oxygen defect concentration was found to sensitively affect the critical temperature Tc and the macroscopic pinning force Fp, resulting in significant changes in magnetization hysteresis loops. Observations of δ dependence of ΔM and Fp at the same reduced temperature T/Tc yielded an insight into the role of oxygen defects: increasing δ results in increasing the pinning center density N. The second peak field B2pk seemed to be determined by the development of a percolating network of magnetically reversible regions from the observation that the temperature dependence of B2pk showed similar behavior to the irreversibility field Birr.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00753863

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