Abstract
The upper critical field and the critical current density of a ceramic sample of superconducting HgBa 2CuO 4+δ have been estimated from resistivity measurements and magnetic hysteresis loop data. The resistivity measurements were done over a temperature range from 10 to 350 K and in a magnetic field up to 5 T. The results showed that the resistive transition has a strong field dependence. A small coherence length of 2.7 nm was estimated in this HgBa 2CuO 4+δ compound. Furthermore the inductive critical current density, deduced from magnetic hysteresis loop d3ta taken in fields up to 1 kOe, is estimated as 16 × 10 5 A/cm 2 at T = 5 K. This value is relatively low in comparison with the well-studied oxide superconductor YBa 2Cu 3O 7−δ.
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