Direct visualization of first-order magnetic transition in La5/8-yPryCa3/8MnO3 (y=0.45) thin films

作者：Rawat R^*; Kushwaha Pallavi; Mishra Dileep K; Sathe V G

来源：Physical Review B, 2013, 87(6): 064412.

DOI：10.1103/PhysRevB.87.064412

First-order antiferromagnetic insulating (AFI)-ferromagnetic metallic (FMM) transition as a function of temperature and magnetic field has been imaged using magnetic force microscopy (MFM) in La5/8-yPryCa3/8MnO3 (y = 0.45) thin film grown on NdGaO3 substrate. These images, showing AFI to FMM transformation during in-field cooling and reverse transformation duringwarming of the same region, cannot be described solely in terms of the broad first-order transition due to quench disorder. Growth morphology of the FMM phase is observed to be path dependent as larger size FMM regions (but with smaller net fraction) are observed for isothermal field induced transition when compared to isofield thermal transition. This is shown to be a consequence of the glasslike arrested AFI state even at approximate to 100 K. Apparent variable range hopping like transport near T-MI during cooling is shown to be a consequence of growth of the FMM phase in an AFI matrix. DOI: 10.1103/PhysRevB.87.064412

• 出版日期2013-2-13