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首页> 外文期刊>Physica, B. Condensed Matter >Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3
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Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3

机译：Pr0.5Sr0.5MnO3中磁性相变的共振光发射光谱研究

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摘要

The valence band electronic structure of Pr0.5Sr 0.5MnO3 has been investigated using resonant photoemission spectroscopies across its paramagnetic metallic (PMM)ferromagnetic metallic (FMM)antiferromagnetic insulator (AFMI) transition. Using bulk sensitive soft X-ray photoemission, we have confirmed the presence of a gap in the near Fermi level electronic spectrum in the charge ordering (CO) antiferromagnetic insulator (AFMI) phase. The Fermi level exhibits a rigid-band-like shift of about ～0.4eV across the PMM to AFMI transition. Further, we have observed a similar shift of the Pr 4f states to higher binding energies when the sample goes to the CO-AFMI state. The spectral behavior indicates a strong charge carrier localization associated with a charge-density-wave gap related to the CO. On the other hand, the growth of spectral weight at the Fermi level in the PMM state could well be connected to the microscopic phase-separation model.
机译：Pr0.5Sr 0.5MnO3的价带电子结构已通过其顺磁金属（PMM）铁磁金属（FMM）反铁磁绝缘体（AFMI）跃迁的共振光发射光谱进行了研究。使用体敏的软X射线光发射，我们已经确认在电荷有序（CO）反铁磁绝缘体（AFMI）相中的费米能级电子光谱附近存在间隙。费米能级在从PMM到AFMI的跃迁上表现出约0.4eV的刚性带状位移。此外，当样品进入CO-AFMI状态时，我们观察到Pr 4f态向较高结合能的相似转变。光谱行为表明与CO相关的电荷密度波隙相关的强载流子局部化。另一方面，在PMM状态下费米能级的光谱权重的增长很可能与微观相相关-分离模型。

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