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首页> 外文期刊>Physical review >Ultrafast dynamics of reversible photoinduced phase transitions in rubidium manganese hexacyanoferrate investigated by midinfrared CN vibration spectroscopy
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Ultrafast dynamics of reversible photoinduced phase transitions in rubidium manganese hexacyanoferrate investigated by midinfrared CN vibration spectroscopy

机译：中红外CN振动光谱法研究六氰合铁酸锰锰中可逆光诱导相变的超快动力学

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摘要

Photoinduced phase switching dynamics between LTP (low-temperature phase: Fe~(2+)-CN-Mn~(3+)) and PIHTP (photoinduced high-temperature phase: Fe~(3+)-CN-Mn~(2+)) in rubidium manganese hexacyanoferrate at 4 K was investigated by visible pump midinfrared probe transient absorption spectroscopy. By monitoring the CN stretching vibration modes, which are sensitive to the valence states of the adjacent metal ions, we could qualify not only LTP and PIHTP but also the phase boundary configurations (Fe~(2+)-CN-Mn~(2+) and Fe~(3+)-CN-Mn~(3+)). In addition, by irradiating with another light inducing the reverse process to the pump light, we were able to apply a pump-probe measurement to the persistent phase transitions. The electronic and structural dynamics in the picosecond region were understood with a phenomenological spectral fitting model. In particular, in both directions of these phase transitions, the instantaneous generation of the boundary configuration was observed. This observation suggests that relatively small domains and/or low-dimensional fjord-like domains are created at the early stage of the transition.
机译：LTP（低温相：Fe〜（2 +）-CN-Mn〜（3+））和PIHTP（光诱导高温相：Fe〜（3 +）-CN-Mn〜（2）之间的光诱导相转换动力学用可见泵中红外探针瞬态吸收光谱法研究了在4 K时六价高铁酸锰man中的+））。通过监测对相邻金属离子的价态敏感的CN拉伸振动模式，我们不仅可以鉴定LTP和PIHTP，还可以鉴定相界构型（Fe〜（2 +）-CN-Mn〜（2+ ）和Fe〜（3 +）-CN-Mn〜（3+））。另外，通过用另一种光照射对泵浦光进行逆过程，我们能够对持久性相变应用泵浦探针测量。通过现象学的光谱拟合模型可以了解皮秒区域的电子和结构动力学。特别地，在这些相变的两个方向上，观察到边界构型的瞬时产生。该观察结果表明，在过渡的早期阶段创建了相对较小的域和/或低维的峡湾状域。

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  • 来源
    《Physical review》 |2012年第19期|195138.1-195138.9|共9页
  • 作者

    Akifumi Asahara; Makoto Nakajima; Ryo Fukaya; Hiroko Tokoro; Shin-ichi Ohkoshi; Tohru Suemoto;

  • 作者单位

    Institute of Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan;

    Institute of Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan;

    Institute of Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan;

    Department of Chemistry, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

    Department of Chemistry, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

    Institute of Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan;

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  • 正文语种 eng
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  • 关键词

    infrared and raman spectra; general studies of phase transitions; processes caused by visible and UV light;

    机译：红外和拉曼光谱;相变的一般研究;可见光和紫外线引起的过程;

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