[Zurück]

E. Bauer, R. Lackner, G. Hilscher, H. Michor, E.-W. Scheidt, W. Scherer, P. Rogl, A. Gribanov, A. Tursina, Y. Seropegin, G. Giester:
"Crystal chemistry and low-temperature properties of Yb₁₈Pt_51.1Si_15.1 (=YbPt₃Si)";
Physical Review B, 73 (2006), S. 104405-1 - 104405-7.

Crystal chemistry and low-temperature properties of Yb₁₈ Pt_51.1Si_15.1 ([approximate]YbPt₃Si)

E. Bauer, R. Lackner, G. Hilscher, and H. Michor
Institute of Solid State Physics, Vienna University of Technology, A-1040 Wien, Austria

E.-W. Scheidt and W. Scherer
Chemische Physik und Materialwissenschaften, Universität Augsburg, D-86159 Augsburg, Germany

P. Rogl
Institute of Physical Chemistry, University of Vienna, Währingerstrasse 42, A-1090 Wien, Austria

A. Gribanov, A. Tursina, and Y. Seropegin
Department of Chemistry, Moscow State University, 11992 Moscow, Russia

G. Giester
Institute of Mineralogy and Crystallography, University of Vienna, Althanstrasse 14, A-1090 Wien, Austria

(Received 8 August 2005; revised 21 November 2005; published 8 March 2006)

Yb₁₈ Pt_51.1Si_15.1 ([approximate]YbPt₃Si) is a representative in the series of RPt_{[approximate]3}Si compounds. The crystal structure of Yb₁₈ Pt_51.1Si_15.1has been determined from room temperature x-ray single crystal charge coupled device data: with a=1.86246(3) nm; c=0.40513(1) nm and space group P4/mbm.
Yb₁₈ Pt_51.1Si_15.1 is isotypic with the structures of (Y,Dy)₁₈Pt_50+xSi_16-x revealing a curvilinear arrangement of distorted CePt₃Si-type fragments around Yb-centered cube-octahedra of Pt₁₂[Yb]. Similar to the structures of (Y,Dy)₁₈Pt_50+xSi_16-x misfit regions with strong distortions are encountered as a typical feature of heavy rare-earth compounds RPt_{[approximate]3}Si. On cooling, Yb₁₈ Pt_51.1Si_15.1orders antiferromagnetically below 1.8 K, followed by a second magnetic phase transition at 500 mK. Physical properties arise from the mutual influence of Ruderman-Kittel-Kasuya-Yosida interaction, the Kondo effect and crystal electric field (CEF) splitting, with the first excited CEF doublet more than 100 K above the ground state. The magnetic field dependence of the low-temperature heat capacity gives rise to a large magnetocaloric effect around 2 K.

©2006 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v73/e104405

doi:10.1103/PhysRevB.73.104405

PACS: 75.80.+q, 71.20.Lp, 71.27.+a, 72.15.Qm

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938222

http://dx.doi.org/10.1103/PhysRevB.73.104405