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Phase coexistence and the magnetic glass-like phase associated with the Morin type spin reorientation phase transition in SmCrO3

机译：与SMCRO3中的MORIN型自旋重新定位相转变相关的相位共存和磁性玻璃状相

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摘要

The phenomenon of spontaneous spin reorientation phase transition (SRPT) in SmCrO3 has been considered as a process comprising continuous rotation of magnetic moments of chromium ions. It is observed that in the vicinity of SRPT, the cooling and warming magnetic curves follow distinctly different paths and in the presence of low measuring fields this thermal irreversibility extends up to the Neel temperature marking a remarkable width of similar to 163 K. Investigating the origin of thermal hysteresis and henceforth the nature of SRPT, we have qualitatively determined the phase fractions of phases involved in the transition. The thermal evolution of phase fraction closely resembles the theoretically predicted phase evolution in the well known Arvami model. The close resemblance suggests that the growth and nucleation mechanism across SRPT is similar to the crystallization process of solids from a supercooled liquid and further confirms the coexistence of two metastable phases in the neighborhood of SRPT. Moreover, the signatures of the magnetic glass like phase, which mainly arises due to the arrest of kinetics during a first order transition, are also noticed below T-SRPT. These observations suggest the discontinuous Morin type nature of the spin reorientation process due to discrete flipping of Cr3+ ions from the high temperature Gamma(4) to low temperature Gamma(1) configuration.
机译：Smcro3中的自发自旋重新定位相转变（SRPT）的现象被认为是包括铬离子磁矩的连续旋转的方法。据观察，在SRPT的附近，冷却和加温磁曲线遵循明显不同的路径和低测量的存在字段此热不可逆性向上延伸到奈耳温度的标记类似于163 K的一个显着的宽度调查原点热滞后和自由的SRPT的性质，我们定性确定了转变中涉及的相位的相位数。相位级分的热量演变非常类似于众所周知的ARVAMI模型中的理论上预测的相位演化。紧密相似之处表明，SRPT的生长和成核机制类似于来自过冷液体的固体的结晶过程，并进一步证实SRPT附近的两个亚稳态阶段的共存。此外，磁性玻璃的特征在于在第一阶转变期间由于动力学阻止而产生的磁性玻璃的签名也被注意到T-Srpt下面。这些观察结果表明，由于从高温γ（4）到低温γ（1）构型Cr3 +离子的离散翻转而导致的旋转重新定位过程的不连续Morin类型性质。

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  • 来源
    《RSC Advances》 |2016年第93期|共8页
  • 作者

    Tripathi Malvika; Choudhary R. J.; Phase D. M.;

  • 作者单位

    UGC DAE Consortium Sci Res Indore Madhya Pradesh India;

    UGC DAE Consortium Sci Res Indore Madhya Pradesh India;

    UGC DAE Consortium Sci Res Indore Madhya Pradesh India;

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  • 正文语种 eng
  • 中图分类 化学;
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