2012 Fiscal Year Final Research Report

Study for room-temperature centimeter-sized ballistic transport alloys

Research Project

Project/Area Number	23651101
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Nanomaterials/Nanobioscience
Research Institution	公益財団法人電磁材料研究所 (2012) Tohoku University (2011)
Principal Investigator	FUKUHARA Mikio 公益財団法人電磁材料研究所, その他部局等, 研究員 (30400401)
Project Period (FY)	2011 – 2012
Keywords	バリステック伝導 / アモルファス合金 / 金属クラスター / トンネリング / センチメートルサイズ
Research Abstract	Ni-Nb-Zr-H glassy alloys with Ni-centered icosahedral Ni_5Zr_5Nb_3 clusters showed centimeter-sized ballistic transport behaviors of 4-fold larger than that of Ag, in low temperature regions up to 223 K, according to increase in degree of amorphousness. Although application of pressure of -8 GPa did not enhance conductivity of the glassy alloys, but changed its sign from negative to positive at 22-25 K. The transport mechanism could be excluded by tunneling of one electron among clusters.