Room temperature hidden state in a manganite observed by time-resolved X-ray diffraction
Room temperature hidden state in a manganite observed by time-resolved X-ray diffraction
复制标题
通过时间分辨 X 射线衍射观察亚锰矿的室温隐藏状态
DOI：
10.1038/s41535-019-0170-3
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发表时间：
2019
影响因子：
5.7
通讯作者：
Chen Jie
中科院分区：
文献类型：
--
作者：
Zhang Haijuan;Zhang Yuanyuan;Li Runze;Yu Junxiao;Dong Wenxia;Chen Conglong;Wang Kuidong;Tang Xiaodong;Chen Jie
实现材料在室温附近的主动量子控制是其实际应用的最终目标之一。最近的技术突破表明，光学刺激可能导致具有独特性质的热不可接近的隐藏状态。然而，大多数报道的隐藏态是在液氮温度附近或低于液氮温度时诱导的。在这里，我们在居里温度300 K附近对锰酸盐进行了光学处理，这通常是复杂相竞争的位置，也是新功能的机会。在室温下形成了一个隐藏态，其阈值行为表现为飞秒顺磁到铁磁的顺序切换，并且伴随着声子软化，在几十皮秒内发生了与热致晶格膨胀不同的结构变化。我们提出，这种隐藏状态源于强相关自旋-电荷量子激发后反铁磁链之间的电荷转移，随后引发轨道极化重排，描述为相关的非热晶格变化。本研究从室温开始，但在相变点附近，这为实际目的创造或操纵新相提供了新的途径。
Realizing active quantum control of materials near room temperature is one of the ultimate aims for their practical applications. Recent technological breakthroughs demonstrated that optical stimulation may lead to thermally inaccessible hidden states with unique properties. However, most of the reported hidden states were induced around or below liquid nitrogen temperature. Here, we optically manipulated a manganite near its Curie temperature of 300 K, where typically complex phase competitions locate as well as opportunities for new functionality. A room temperature hidden state was formed with threshold behavior evidenced by a femtosecond paramagnetic to ferromagnetic order switching and a structural change distinct from thermal induced lattice expansion in tens of picoseconds accompanying with phonon softening. We propose that such a hidden state originates from the charge transfer between antiferromagnetic chains after strongly correlated spin-charge quantum excitation, which subsequently initiates an orbital polarization rearrangement described asand associated non-thermal lattice change. This study started from room temperature yet near a phase transition point, which suggests a new route to create or manipulate novel phases for practical purpose.