Ferromagnetism in germanium clathrate: Ba[sub 8]Mn[sub 2]Ge[sub 44]

Kawaguchi, Tetsuji; Tanigaki, Katsumi; Yasukawa, Masahiro; Yakusawa, Masahiro
November 2000
Applied Physics Letters;11/20/2000, Vol. 77 Issue 21
Academic Journal
A unique magnetic nanosystem, constructed from Ge[sub 20] dodecahedrons and Mn, is presented, which shows a ferromagnetic transition around 10 K. In this system with the formula Ba[sub 8]Mn[sub x]Ge[sub 46-x] (x=1-2), the Mn atoms can be incorporated with accurate control in position of the crystal lattice. The spontaneous magnetization is approximately linearly proportional to the amount of Mn introduced and is maximized at x=2. Magnetic measurements reveal that the d electrons are almost localized on Mn atoms but also affected by conduction electrons spreading over the clathrate network. © 2000 American Institute of Physics.


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