Dynamics of nonergodic ferromagnetic/antiferromagnetic ordering and magnetocalorics in antiperovskite Mn 3 SnC
Dynamics of nonergodic ferromagnetic/antiferromagnetic ordering and magnetocalorics in antiperovskite Mn 3 SnC
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DOI：
10.1103/physrevb.96.014436
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发表时间：
2017-07
影响因子：
3.7
通讯作者：
O. Cakir;F. Cugini;M. Solzi;K. Priolkar;M. Acet;M. Farle
中科院分区：
文献类型：
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作者：
O. Cakir;F. Cugini;M. Solzi;K. Priolkar;M. Acet;M. Farle
我们研究了${\mathrm{Mn}}_{3}\mathrm{SnC}$中混合磁结构跃迁时磁组态的时间依赖关系。转变的非遍历性质涉及到最终磁构型的稳定，这涉及到额外的AF有序，这在转变开始时是不存在的，只是在时间上发展。我们通过磁场和时间相关磁化研究表明，在大约1小时的时间尺度上存在非遍历性。观察到两个与跃迁有关的特征时间。通过热容研究，研究了遍历条件下的平衡热力学，确定了过渡前后的熵变和绝热温度变化。我们发现间接法和直接法在确定绝热温度变化方面是一致的，并讨论了非过能性对磁热效应的影响。
We investigated the time dependence of the magnetic configuration at the mixed magnetic magnetostructural transition in ${\mathrm{Mn}}_{3}\mathrm{SnC}$. The nonergodic nature of the transition involves the stabilization of a final magnetic configuration that involves additional AF ordering which is not present when the transition is initiated and develops only in time. We show the presence of the nonergodicity over a time scale of about 1 hour by field and time-dependent magnetization studies. Two characteristic times related to the transition are observed. We also study the equilibrium thermodynamics under ergodic conditions by heat capacity studies and determine the entropy-change and the adiabatic temperature change around the transition. We find agreement between the indirect and direct methods in determining the adiabatic temperature change and discuss the influence of nonergodic properties on the magnetocaloric effects.