| Autor: |
Doležal P; Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic., Duverger-Nédellec E; CNRS, ICMCB, UMR 5026, University Bordeaux, F-33600 Pessac, France., Mičková Z; Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic., Proschek P; Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic., Illková K; Czech Academy of Sciences, Institute of Plasma Physics, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic., Daniš S; Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic., Bartha K; Charles University, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 5, 121 16 Prague 2, Czech Republic., Javorský P; Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic. |
| Abstrakt: |
This work is focused on the structural and physical properties of CePt 2 Al 2 , an intermetallic compound. At room temperature, the modulated orthorhombic structure Cmme ( a 00)000, with q → = (0.481, 0, 0) has been determined by single-crystal X-ray diffraction supplemented by dependence of lattice parameters above room temperature for which the X-ray powder diffraction was used. The compound undergoes a structural transition to a tetragonal structure above room temperature. This transition exhibits 50 °C hysteresis and creates a domain structure in the sample. The magnetic behavior has been studied by specific heat, magnetization, and transport measurements in the temperature range between 0.5 and 300 K. Specific heat and susceptibility shows an antiferromagnetic order below 2 K. On the basis of electrical resistivity and other bulk measurements, CePt 2 Al 2 can be considered a Kondo lattice material. The presence of a modulated crystal structure opens the possibility of a charge density wave state in CePt 2 Al 2 as observed for (Re)Pt 2 Si 2 . |
