[1] Natl Inst Mat Sci, Superconducting Properties Unit, Tsukuba, Ibaraki 3050044, Japan
[2] Hokkaido Univ, Grad Sch Chem Sci & Engn, Sapporo, Hokkaido 0600810, Japan
[3] Natl Inst Mat Sci, Mat Proc Unit, Tsukuba, Ibaraki 3050047, Japan
[4] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton WPI MANA, Tsukuba, Ibaraki 3050044, Japan