Antiferromagnetic behavior in CeCo$_{9}$Ge$_{4}$
| Autor: | Gold, C., Peyker, L., Scheidt, E. -W., Michor, H., Scherer, W. |
|---|---|
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Journal of Physics: Conference Series 200 (2010) 012049 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1742-6596/200/1/012049 |
| Popis: | We investigate the novel intermetallic ternary compounds \emph{R}Co$_{9}$Ge$_{4}$ with \emph{R} = La and Ce by means of $X$-ray diffraction, susceptibility and specific heat measurements. CeCo$_{9}$Ge$_{4}$ crystallizes in the space group ${I}$ 4/ ${mcm}$ and is characterized by the coexistence of two different magnetic sublattices. The Ce-based sublattice, with an effective moment close to the expected value for a Ce$^{3+}$-ion, exhibits a magnetically ordered ground state with $T_{\mathrm{N}}=12.5$ K. The Co-based sublattice, however, exhibits magnetic moments due to itinerant 3$d$ electrons. The magnetic specific heat contribution of the Ce-sublattice is discussed in terms of a resonance-level model implying the interplay between an antiferromagnetic phase transition and the Kondo-effect and an underlying Schottky-anomaly indicating a crystal field level scheme splitting into three twofold degenerated micro states ($\Delta_1 = 69$ K, $\Delta_2 = 133$ K). Comment: 4 pages, 3 figures, conference SCES09 |
| Databáze: | arXiv |
| Externí odkaz: |
|