Effects of Magnetic Field on Charge-Ordering Transitions inLa₂CuO_4.08 and Pr_0.5Sr_0.5MnO₃

The applied magnetic field can result in evident changes on the charge-ordering transitions in both Cu-based high T_c superconductors and Mn-based colossal magnetioresistance materials. Alternations of charge modulation and melting of well-defined charge stripes can be commonly observed when the magnetic field is over 2T. We herein present the experimental data obtained in La₂CuO_4.08 and Pr_0.5Sr_0.5MnO₃ materials, illustrating this kind of interesting phenomena at low temperatures. In particular, some essential structural features alternating along with charge-ordering transition have been discussed.