1. School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
2. School of Materials Science & Engineering, Sun Yat-sen University, Guangzhou, Guangdong Province 510275, China
3. School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-748, Republic of Korea
4. Research and Development Division, Tanaka Precious Metals, 22, Wadai, Tsukuba 300-4217, Japan
5. Computational Materials Department, Korea Institute of Materials Science, Changwon 51508, Republic of Korea