Inhaltszusammenfassung

A comparative study of the low field AC susceptibility of the superconducting compound (Bi, Pb)2 xSr2?yCa2 y Cu3 zO10 ? with x=0(0.1), y=0(0.4, 0.2, 0.1, 0), and z=0.5(0.6, 0.3, 0.15, 0) is presented. The samples were prepared by the conventional solid state reaction in air. X-ray diffraction patterns reveal the virtually single phase nature of the pellets. Resistively measured critical temperatures Tc0 up to 113 K could be obtained. The AC susceptibility data show onset temperatures in th...A comparative study of the low field AC susceptibility of the superconducting compound (Bi, Pb)2 xSr2?yCa2 y Cu3 zO10 ? with x=0(0.1), y=0(0.4, 0.2, 0.1, 0), and z=0.5(0.6, 0.3, 0.15, 0) is presented. The samples were prepared by the conventional solid state reaction in air. X-ray diffraction patterns reveal the virtually single phase nature of the pellets. Resistively measured critical temperatures Tc0 up to 113 K could be obtained. The AC susceptibility data show onset temperatures in the temperature range 108?112.9 K. Convincing agreement between theory and experimental data was obtained by assuming a critical state model with field dependent critical transport current density jc for the intergranular component of the shielding behaviour according to the Anderson-Kim model. As a rule, the intragranular part of the AC susceptibility reveals no sign of hysteretic losses (??) for field amplitudes up to 150 A/m. The field dependent shift of the imaginary part ?? of the complex AC susceptibility ? can be used to infer the transport critical current density of the weak link network. » weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik