Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
J Phys Condens Matter. 2011 Nov 23;23(46):466002. doi: 10.1088/0953-8984/23/46/466002. Epub 2011 Nov 1.
The persistent photoinduced magnetization (PPM) in the low bandwidth material Pr(1-x)Ca(x)MnO₃ at the low hole doping level of x = 0.1 is reported. Upon zero-field cooling under photoexcitation, significant improvement of the ferromagnetic (FM) ordering was observed in the low temperature spin-glass phase. However, upon field cooling, the FM ordering was found to be suppressed due to weakening of the double-exchange interaction. High kinetic energy x-ray photoelectron spectroscopy measurements indicated a slight increase in the Mn³⁺ peak under photoexcitation which clarifies the weakening of the FM interaction. The fast relaxation of the PPM is discussed in view of localization of spin polarons in sites of magnetic disorders and the results are compared with previous reports of PPM in intermediate bandwidth Pr₀.₉Ca₀.₁MnO₃ samples.
在低空穴掺杂水平 x = 0.1 的低带宽材料 Pr(1-x)Ca(x)MnO₃ 中，报道了持续光致磁（PPM）现象。在光激发下的零场冷却过程中，在低温自旋玻璃相中观察到铁磁（FM）有序的显著增强。然而，在场冷却下，由于双交换相互作用的减弱，FM 有序被抑制。高动能 X 射线光电子能谱测量表明，光激发下 Mn³⁺峰略有增加，这表明 FM 相互作用减弱。根据自旋极化子在磁无序位置的局域化，讨论了 PPM 的快速弛豫，结果与之前报道的中间带宽 Pr₀.₉Ca₀.₁MnO₃ 样品中的 PPM 进行了比较。
