Dear Editors, The properties of mixed-valence manganites are sensmve to the synthesis conditions [ 1 ]. For oxide films grown by pulsed laser deposition （PLD）, the physical properties are affected obviously by the growth oxygen pressure and annealing treat- ment [2-5]. Using the PLD method, manganite oxides are usually grown at different oxygen pressures to investigate the effects of oxygen content on their properties. However,
