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Observation of Vortex Lattice Related Anomalies in Polycrystalline YBa2Cu3O7-x Near the Superconducting Transition

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DOI: 10.4236/jmp.2012.310183    3,516 Downloads   4,894 Views   Citations
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ABSTRACT

The d.c. I-V characteristic of polycrystalline YBa2Cu3O7-x high temperature superconductors (HTSC) is measured near the transition temperature (Tc). The Tc was found to be 90 K with a width of 2 K. The voltage was measured at various current values and with reversing the current. A difference in voltage was found for forward and reverse current directions near Tc. The observed directionality of the I-V characteristic can be understood in terms of quantized magnetic flux by the self-field of the current and the proximity junctions in these materials. This can also be understood qualitatively as due to the d-wave superconductivity. The measured dc voltage showed increased noise near Tc which is possibly related to 1/f noise due to the motion of Abrikosov flux lines.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

S. Ota, "Observation of Vortex Lattice Related Anomalies in Polycrystalline YBa2Cu3O7-x Near the Superconducting Transition," Journal of Modern Physics, Vol. 3 No. 10, 2012, pp. 1487-1489. doi: 10.4236/jmp.2012.310183.

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