应变对La5/8-yPryCa3/8MnO3（y=0.45）薄膜磁性玻璃态相分离和反玻璃化的影响
Effect of strain on phase separation and de-vitrification of magnetic glass state in thin films of La5/8-yPryCa3/8MnO3 (y=0.45)
摘要：
研究了衬底应变对在LaAlO_3、NdGaO_3和SrTiO_3衬底上生长的La_（5/8）-yPryCa_（3/8）MnO_3（y=0.45）薄膜的影响。据观察，生长在NdGaO 3上的非应变膜的行为非常相似的散装材料，但生长在SrTiO 3上的应变膜显示在低温下的绝缘相熔化为金属相。然而，大规模的相分离和亚稳玻璃态观察在所有的薄膜，尽管在衬底诱导的应变的差异。的电阻率作为温度的函数下的冷却和加热在不相等的领域（CHUF）协议的测量阐明了玻璃状的亚稳相的存在下产生的动力学逮捕的一阶变换在所有的膜。与结构玻璃一样，这些磁性玻璃状相显示出随着磁场的等温增加和/或等场升温而从捕获电荷有序反铁磁绝缘体（CO-AFI）相到平衡铁磁金属（FMM）相的失透的证据。这些测量也清楚地表明该体系的平衡基态为FMM，亚稳玻璃相为AFI相。
英文摘要：
We present our study of effect of substrate induced strain on the La5/8-yPryCa3/8MnO3 (y=0.45), thin films grown on LaAlO3, NdGaO3 and SrTiO3 susbtrates that show large scale phase separation. It is observed that unstrained films grown on NdGaO3 behave quite similar to bulk material but the strained film grown on SrTiO3 show melting of insulating phase to metallic phase at low temperatures. However, the large scale phase separation and metastable glass-like state is observed in all the films despite difference in substrate induced strain. The measurements of resistivity as a function of temperature under cooling and heating in unequal field (CHUF) protocol elucidates the presence of glass-like meta-stable phase generated due to kinetic arrest of first order transformation in all the films. Like structural glasses, these magnetic glass-like phase shows evidence of devitrification of the arrested charge order-antiferromagnetic insulator (CO-AFI) phase to equilibrium ferromagnetic metallic (FMM) phase with isothermal increase of magnetic field and/or iso-field warming. These measurements also clearly brought out the equilibrium ground state of this system to be FMM and metastable glass-like phase to be AFI phase.
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