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首页> 外文期刊>Physica, B. Condensed Matter >Possible excitonic phase of (Pr1-yRy)(1-x)CaxCoO3 (R = Lanthanides and Y)
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Possible excitonic phase of (Pr1-yRy)(1-x)CaxCoO3 (R = Lanthanides and Y)

机译：（Pr1-yry）（1-x）caxcoo3（r =镧和y）的可能的兴高性相

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(Pr1-yRy)(1-x)CaxCoO3 (R = Y and/or Lanthanide elements) exhibits a "hidden order transition" in the (x, y) region near (0.5, 0.0) at temperature T-s, where none of magnetic ordering and change of the space group have been found, even though significant anomalies in various physical quantities exist. When the (x, y) is outside of the above region, the transition can essentially be understood by the spin-state-crossover of isolated Co atoms. To study whether excitonic condensation (EC) recently proposed is relevant to the "hidden order transition", we measured magnetic excitation spectra chi" (Q, omega) by means of inelastic neutron scattering on a single crystal of (Pr0.8Y0.2)(0.7)Ca0.3CoO3, and obtained following results: While the spectra from the Co 3d electrons observed at 200 K (above T-s) have characteristics of ordinary strongly correlated electron systems, the chi" (Q, omega) - omega curve at 4 K ( T-s) has a feature reminiscent, at first sight, of a weak pseudogap-like structure. This result can be explained by the realization of the EC phase or "EIQ" phase reported by Nasu et al. [Phys. Rev. B 93 205136 (2016)], or at least by the picture that the system is in the boundary region between the low-spin and EQI '' phases. This result strongly suggests that there exists the EIQ phase in the present sample or at least in (Pr1-yRy)(1-x)CaxCoO3 with (x, y) near (0.5, 0.0).
机译：（PR1-贝利）（1-x）的CaxCoO3（R = Y和/或镧系元素）表现出在温度Ts，一个 “隐藏顺序过渡” 在（x，y）的附近区域（0.5，0.0），其中无磁性订货和空间群的变化已经发现，即使在各种物理量显著异常存在。当（X，Y）在上述区域之外，该过渡可以基本上由分离的Co原子的自旋 - 状态 - 交叉理解。为了研究激子缩合（EC）最近提出是否是相关的“隐藏顺序过渡”，我们上的单晶测量磁激发光谱志”（Q，ω-）由非弹性中子散射（Pr0.8Y0.2） （0.7）Ca0.3CoO3，并获得了以下结果：虽然有联合光谱3d中在200K的观察到的电子（＆中的TS）具有普通强关联电子系统中，智的特性”（Q，ω-） - 欧米加曲线在4K（小于TS）具有一个特征让人想起，乍一看，弱赝状结构。该结果可通过实现EC相或“EIQ”阶段那须等报道的进行说明。 [物理。版本B 93 205136（2016）]，或至少由图像，该系统是在低自旋和EQI“”相之间的边界区域。该结果有力地表明，存在接近（0.5，0.0）在本样品中的EIQ相或至少在（PR1-贝利）（1-x）的CaxCoO3用（X，Y）。

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