Photo-induced charge-transfer phase transition of rubidium manganese hexacyanoferrate in ferromagnetic and paramagnetic states
Photo-induced charge-transfer phase transition of rubidium manganese hexacyanoferrate in ferromagnetic and paramagnetic states
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DOI：
10.1016/j.jmmm.2006.10.429
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发表时间：
2007-03
影响因子：
2.7
通讯作者：
H. Tokoro;K. Hashimoto;S. Ohkoshi
中科院分区：
文献类型：
--
作者：
H. Tokoro;K. Hashimoto;S. Ohkoshi
在RbMn[Fe(CN)6](1)、Rb0.88Mn[Fe(CN)6]0.96·0.6H2O(2)和Rb0.97Mn[Fe(CN)6]0.99·0.2H2O(3)三种六氰高铁铷锰酸盐中观察到热滞回线的电荷转移相变。这种相变伴随着从立方（F4¯3m）到四边形（I4¯m2）的结构变化。其高温相（HT）和低温相（LT）分别由MnII(S=2/5) NC-FeIII （S=1/2）和MnIII(S=2) -NC-FeII （S=0）组成。相变是由金属到金属的电荷从mnii转移到feii和产生的mnii的Jahn-Teller畸变引起的。在2的LT相的铁磁状态下，观察到光致相变，即仅用一次激光脉冲照射即可淬灭磁化。这种现象是由光诱导相变引起的，从LT相到HT相。在3中，观察了室温下顺磁区LT相和HT相之间的光切换。
A charge transfer phase transition with thermal hysteresis loop is observed in a series of rubidium manganese hexacyanoferrates, RbMn[Fe(CN)6] (1), Rb0.88Mn[Fe(CN)6]0.96·0.6H2O (2), and Rb0.97Mn[Fe(CN)6]0.99·0.2H2O (3). This phase transition is accompanied by a structural change from cubic (F4¯3m) to tetragonal (I4¯m2). Its high-temperature (HT) and low-temperature (LT) phases are composed of MnII(S=2/5)NC–FeIII(S=1/2) and MnIII(S=2)–NC–FeII(S=0), respectively. The phase transition is caused by a metal-to-metal charge transfer from MnIIto FeIIIand a Jahn–Teller distortion of the produced MnIIIion. At the ferromagnetic state in LT phase of 2, the photo-induced phase transition is observed, i.e., magnetization is quenched by the irradiation with only one shot of laser pulse. This phenomenon is caused by a photo-induced phase transition from the LT phase to the HT phase. In 3, optical switching between LT and HT phases at room temperature in paramagnetic region is observed.