Influence de l'introduction de défauts colonnaires amorphes sur les propriétés de transport d'un monocristal supraconducteur à haute Tc
Résumé
Columnar defects can be introduced in high Tc superconductors by irradiation with high energy heavy ions. The concentration of these artificial pinning centers with a well characterized morphology is easily controlled. The pinning efficiency of these defects has been often demonstrated, mainly from magnetization measurements. In the present work, measurements of the electrical resistance along the c axis, Rc(T), in the presence of columnar defects are presented. They show the ability of these defects to prevent the thermal fluctuations effects. The measurements have been performed on the same crystal before and after the heavy ion irradiation.
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Articles anciens
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