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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 105 (1996), S. 1189-1194 
    ISSN: 1573-7357
    Keywords: 74.60.Ec ; 74.60.Ge ; 74.72.Hs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 105 (1996), S. 1201-1206 
    ISSN: 1573-7357
    Keywords: 74.30.Ci ; 74.60.Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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