[Zurück]

A. Grytsiv, X. Chen, N. Melnychenko-Koblyuk, P. Rogl, E. Bauer, G. Hilscher, H. Kaldarar, H. Michor, E. Royanian, R. Podloucky, M. Rotter, G. Giester:
"Superconductivity and Magnetism in MPt₄Ge₁₂, M = Ca, Ba, Sr, Eu";
Journal of the Physical Society of Japan, 77 (2008), S. 121 - 127.

X-ray powder data for Ba_0.8Ca_0.2Pt₄Ge₁₂ and X-ray single crystal data for EuPt₄Ge₁₂ define cubic body-centered symmetry consistent with novel Ge-based skutterudites SrPt₄Ge₁₂ and BaPt₄Ge₁₂ (space group Im3). Structural and electron microprobe analysis investigations evidence a complete filling of the icosahedral cages without large atomic displacement parameters. Ba_0.8Ca_0.2Pt₄Ge₁₂ exhibits phonon-mediated superconductivity at Tc = 5.2 K. Density functional theory (DFT) calculations (LDA+U) carried out for EuPt₄Ge₁₂ proved that Eu guest atoms strongly stabilize the compound in which the calculated density of states around the Fermi energy essentially consists of hybridized Ge 4p-like and Pt 5d-like states. Low temperature resistivity studies evidence magnetic ordering at Tm ≈1.7 K. Susceptibility measurements reveal a divalent state for europium, in excellent agreement with the DFT calculations.

Ge-based Skutterudite, EuPt₄Ge₁₂, X-ray single crystal data, transport properties, electronic structure by DFT (LDA+U)

http://jpsj.ipap.jp/link?JPSJS/77SA/121/