DETERMINATION OF IRREVERSIBILITY LINE OF AN LA1.87SR0.13CUO4 SINGLE-CRYSTAL - A SCALING APPROACH

Using a scaling approach, we have reexamined the VSM experimental data of the magnetizations versus the applied fields for an La1.87Sr0.13Cu O4 Single crystal. The irreversible magnetization against applied fiel d (i.e. M(irr) versus H(a)) curves in the temperature range 4.2-30 K h ave been rescaled onto one single curve. Combining the scaling approac h to the angle-dependent property of the M(irr)(theta) versus H(a)(the ta) curves introduced previously, one can experimentally determine the irreversible magnetic field values at low temperatures unambiguously.