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Zeitschriftenartikel:

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.



Kurzfassung englisch:
X-ray powder data for Ba0.8Ca0.2Pt4Ge12 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. Ba0.8Ca0.2Pt4Ge12 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.

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


Elektronische Version der Publikation:
http://jpsj.ipap.jp/link?JPSJS/77SA/121/


Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.