Inhaltszusammenfassung

The influence of Zn-impurity atoms on the superconducting critical temperature Tc, the resistive transitions in magnetic fields ab(TB, T) and the critical current density jabc(B, T) of epitaxially grown, c-axis oriented YBa2(Cu1??Zn?)3O7 films is reported. For very small concentrations ? ? 0.005 we observe a narrowing of the resistive transitions which leads to a crossing of the depinning lines and corresponds to an enhancement of the average activation energy U by a factor of two. The pinnin...The influence of Zn-impurity atoms on the superconducting critical temperature Tc, the resistive transitions in magnetic fields ab(TB, T) and the critical current density jabc(B, T) of epitaxially grown, c-axis oriented YBa2(Cu1??Zn?)3O7 films is reported. For very small concentrations ? ? 0.005 we observe a narrowing of the resistive transitions which leads to a crossing of the depinning lines and corresponds to an enhancement of the average activation energy U by a factor of two. The pinning effectivity of the Zn-dopant atoms can also be deduced from an enhancement of jabc(B, T)/jabc(0, T) in large magnetic fields B ? 6T and characteristics features in the angular dependence of jabc(B, T, ) where is the angle between the external field and the - axis. » weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik