1. Division of Materials ScienceFaculty of Pure and Applied SciencesUniversity of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan
2. Department of PhysicsFaculty of Science and Engineering, Nusa Cendana University Adisucipto street Penfui Kupang, NTT 85001 Indonesia
3. Tsukuba Research Center for Energy Materials Science (TREMS)University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan