Author(s)

S. B. Ota

Institute of Physics, Bhubaneswar, India.

The d.c. I-V characteristic of polycrystalline YBa₂Cu₃O_7-x high temperature superconductors (HTSC) is measured near the transition temperature (T_c). The T_c 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 T_c. 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 T_c which is possibly related to 1/f noise due to the motion of Abrikosov flux lines.

HTSC; Transition Temperature; 1/f Noise

S. Ota, "Observation of Vortex Lattice Related Anomalies in Polycrystalline YBa₂Cu₃O_7-x Near the Superconducting Transition," Journal of Modern Physics, Vol. 3 No. 10, 2012, pp. 1487-1489. doi: 10.4236/jmp.2012.310183.