Abstract
For magnetic fields parallel to the c-axis configuration for a layered structure Hg-1223 compound, the M–H curves displayed the wrong sign of hysteresis (virgin curve lies above the reverse curve) within a certain temperature regime ≥96 K. For the temperature region below 96 K, the magnetic response was caused by a one-component (three-dimensional) system. For 96 K<T<108 K, the interunit cell coupling of CuO2 plane pairs is broken, but the coupling of CuO2 planes inside the unit cell is effective. At the temperature region above 108 K, the magnetic response was caused by the fluctuation of two-dimensional pancake vortices in a decoupled CuO2 plane inside the unit cell.
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