论文标题
eu_ {0.8} cr_ {0.2} mn_2o_5中光泵和磁场对相分离域状态的影响
Effect of the Optical Pumping and Magnetic Field on the States of Phase Separation Domains in Eu_{0.8}Cr_{0.2}Mn_2O_5
论文作者
论文摘要
研究了光学抽水和施加磁场对一维超晶格中铁磁层特性的影响。在足够低的温度下，这些层对应于RMN_2O_5和R_ {0.8} CE_ {0.2} MN_2O_5多效体中的相位分离域。由于Mn^{3+}和Mn^{4+}离子的电荷顺序以及E_G电子在这对离子之间隧道的有限概率，因此发生了此类域的形成。这样的超晶格占据的体积很小，可以将其视为孤立的铁磁半导体异质结构，在宿主晶体中自发形成。研究了与EU_ {0.8} CE_ {0.2} Mn_2O_5中的超晶格层相关的铁磁共振序列。这些共振的特征提供了有关此类层的特性的信息。首次证明，光学泵送产生了新的亚稳态超晶格，这可以通过磁场循环到光学泵之前存在的状态来恢复。发现被磁场回收的超晶格的温度高于生长的晶体中的高温。
The effect of optical pumping and applied magnetic field on the characteristics of ferromagnetic layers in one-dimensional superlattices is studied. At low enough temperatures, these layers correspond to phase separation domains in RMn_2O_5 and R_{0.8}Ce_{0.2}Mn_2O_5 multiferroics. The formation of such domains occurs owing to the charge ordering of Mn^{3+} and Mn^{4+} ions and to the finite probability for e_g electrons to tunnel between these pairs of ions. The volume occupied by such superlattices is rather small, and they can be treated as isolated ferromagnetic semiconductor heterostructures, spontaneously formed in the host crystal. The sequences of ferromagnetic resonances related to the superlattice layers in Eu_{0.8}Ce_{0.2}Mn_2O_5 are studied. The characteristics of these resonances give information on the properties of such layers. For the first time, it is demonstrated that the optical pumping gives rise to a new metastable state of superlattices, which can be recovered by the magnetic field cycling to the state existing before the optical pumping. It is found that the superlattices recovered by the magnetic field exist up to temperatures higher than those in as-grown crystals.
