Crystal chemistry and low-temperature properties of Yb18Pt51.1Si15.1 (~YbPt3Si)
- Autor(en)
- Ernst Bauer, Roman Lackner, Gerfried Hilscher, Herwig Michor, Ernst Wilhelm Scheidt, W Scherer, Peter Franz Rogl, Alexander V Gribanov, Anna I. Tursina, Yuri D. Seropegin, Gerald Giester
- Abstrakt
Yb18 Pt51.1 Si15.1 (˜Yb Pt3 Si) is a representative in the series of R Pt˜3 Si compounds. The crystal structure of Yb18 Pt51.1 Si15.1 has 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 Pt51.1 Si15.1 is isotypic with the structures of (Y,Dy)18 Pt50+x Si16-x revealing a curvilinear arrangement of distorted Ce Pt3 Si -type fragments around Yb-centered cube-octahedra of Pt12 [Yb]. Similar to the structures of (Y,Dy)18 Pt50+x Si16-x misfit regions with strong distortions are encountered as a typical feature of heavy rare-earth compounds R Pt˜3 Si. On cooling, Yb18 Pt51.1 Si15.1 orders 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. Œ 2006 The American Physical Society.
- Organisation(en)
- Institut für Physikalische Chemie, Institut für Mineralogie und Kristallographie
- Externe Organisation(en)
- Technische Universität Wien, Universität Augsburg, Lomonosov Moscow State University (MSU)
- Journal
- Physical Review B
- Band
- 73
- Seiten
- 1-7
- Anzahl der Seiten
- 7
- ISSN
- 1098-0121
- Publikationsdatum
- 2006
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105113 Kristallographie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/1e7e8a32-c19e-41d0-8204-1c97db9ffade