Photoinduced Phase Transitions in MMX-Chain Compounds - Material Designs and New Physical Properties in MX-and MMX-Chain Compounds - page 236

11.4 Summary
In this chapter, we have reviewed the studies of photoinduced phase transition
(PIPT) in the MMX-chain compound. The PIPT of the iodine-bridged binuclear Pt
compound, [(C 2 H 5 ) 2 NH 2 ] 4 [Pt 2 (pop) 4 I], between the charge-density-wave (CDW)
state and the charge polarization (CP) state has been discussed on the basis of the
results obtained by several kinds of optical spectroscopies. This transition is an
exceptional example of PIPT, demonstrating that it is possible to achieve funda-
mental changes in optical and magnetic properties in both directions from CDW to
CP and CP to CDW through photoirradiation alone. In this compound, the
investigations of the dynamics using the pump-probe spectroscopy has not been
performed yet, which will clarify more detailed pictures of its PIPT. The finding of
PIPT presented here indicates that MMX-chain compound can be candidates of
future optical switching and memory devices.
Acknowledgment The studied reported here were done in collaboration with many researchers;
Mr. T. Matsuoka, Prof. M. Yamashita, and Prof. S. Takaishi (Tohoku University), Prof. H. Kishida
(Nagoya University). We thank all of these collaborators. We also thank Dr. K. Iwano and Prof. K.
Nasu (KEK), Prof. K. Yonemitsu and Dr. M. Kuwabara (IMS), and Prof. S. Yamamoto (Hokkaido
University) for valuable discussions.
References
1. Matsuzaki H, Matsuoka T, Kishida H, Takizawa K, Miyasaka H, Sugiura K, Yamashita M,
Okamoto H (2003) Phys Rev Lett 90:046401
2. Robin MB, Day P (1967) Adv Inorg Radiochem 10:247
3. Kumoo M, Clark R (1985) Inorg Chem 24:4320
4. Butler LG, Zietlow MH, Che CM, Schaefer WP, Sridhar S, Grunthaner PJ, Swanson BI, Clark
RJH, Gray HB (1988) J Am Chem Soc 110:1155
5. Yamashita M, Miya S, Kawashima T, Manabe T, Sonoyama T, Kitagawa H, Miya T, Okamoto
H, Ikeda R (1999) J Am Chem Soc 121:2321
6. Kuwabara M, Yonemitsu K (2001) J Phys Chem Solids 62:453
7. Yamamoto S (2001) Phys Rev B 63:125124
8. Yamamoto S (2001) J Phys Soc Jpn 70:1198
9. Yamamoto S (2001) Phys Rev B 64:140402
10. Kimura N, Ohki H, Ikeda R, Yamashita M (1994) Chem Phys Lett 220:40
11. Bellitto C, Flamini A, Gastaldi L, Scaramuzza L (1983) Inorg Chem 22:4-34
12. Kitagawa H, Onodera N, Sonoyama T, Yamamoto M, Fukawa T, Mitani T, Seto M, Maeda Y
(1999) J Am Chem Soc 121:10068
13. Takizawa K, Ishii T, Miyasaka H, Matsuzaka H, Yamashita M, Kawashima T, Matsuzaki H,
Kishida H, Okamoto H (2002) Mol Cryst Liq Cryst 376:159
14. Baeriswyl D, Bishop AR (1988) J Phys C 21:339
15. Hemley RJ, Ashcroft NW (1998) Phys Today 51:26
16. Bonner JC, Fisher ME (1964) Phys Rev 135:A640
17. Kuwabara M, Yonemitsu K (2001) J Mater Chem 11:2163
18. Yonemitsu K, Miyashita N, Kuwabara M (2003) Synth Met 135:521
19. Yonemitsu K, Miyashita N (2003) Phys Rev B 68:75113