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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

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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