**4. Acknowledgment**

Part of this research was supported by JST PRESTO program, Grant in Aid for Scientific Research (No. 21310073) from the Ministry of Education, Sports, Science and Technology of the Japanese Government. The authors would like to thank Dr. Kenji Katayama and Dr. Tsuguo Sawada for their help in the setup of TG equipment and also thank Mr. Yasumasa Ayuzawa for his help in some experiments. The authors are grateful to Prof. Juan Bisquert, Prof. Roberto Go´mez, Mr. Ne´stor Guijarro, Dr. Sixto Gime´nez, and Dr. Iva´n Mora-Sero´ for their collaboration and help in the research.
