2004 Fiscal Year Final Research Report Summary
Structure and formation dynamics of the photo-induced phase transition in Fe spincrossover complexes
| Project/Area Number |
14340092
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Kyoto University |
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Principal Investigator |
TANAKA Koichiro Kyoto University, Department of Physics, Professor, 大学院・理学研究科, 教授 (90212034)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAI Masaya Kyoto University, Department of Physics, Research Associate, 大学院・理学研究科, 助手 (30343239)
SHIRAI Masanobu Kyoto University, Department of Physics, Research associate, 大学院・理学研究科, 助手 (30303803)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Photo-induced phase transition / spin crossover / infrared absorption / infrared Raman scattering / structural phase transition / spontaneous symmetry breaking |
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| Research Abstract |
Photo-induced phase transition(PIPT) is quite attractive phenomenon for non-equilibrium physics. Novel self-organized structure is expected in a system far from thermal equilibrium. In this project, we focued on the photo-induced spin-crossover transition and explored the structure of the photo-induced macroscopic phase using Raman scattering, infrared absorption, EXAFS, and X-ray diffraction techniques. In Fe-pic. complexes, large difference was found between thermally and light-induced high-spin states only in the Raman scattering experiments, whereas the EXAFS and X-ray diffraction revealed that the bond-lengths and long range order in the photo-induced phase are quite similar to those in the high temperature high spin phase. Possibility of the symmetry lowering was discussed. In addition, we measured photo-induced phenomena and found a spin-selective PIPT in binuclear spin-crossover complex, [Fe(bt)(NCS)_2]_2(bpym) that shows two step thermal phase transition via an intermediate state. The Raman scattering and infrared absorption are measured and discussed with a phenomenological model. A Terahertz spectrometer that is combined with ATR technique was developed to measure a hydrogen bonging in the spin-crossover complexes.
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