Antimony valence and the magnetization processes in the spinels (Cu)[CrSb]Se-4

作者：Krok Kowalski J; Warczewski J^*; Gusin P; Sliwinska T; Urban G; Malicka E; Pacyna A; Mydlarz T; Rduch P; Wladarz G

来源：Journal of Alloys and Compounds, 2009, 478(1-2): 14-18.

DOI：10.1016/j.jallcom.2008.11.021

• Magnetically ordered materials
• Semiconductors
• Spin glasses
• Magnetic measurements
• Exchange and superexchange

The spinel stoichiometric compounds of the CuCr2-xSbxSe4 family were obtained for the first time and prepared with the assumption of the valence of Sb ions equal to 3. The magnetization isotherms at 4.2 K and at the magnetic stationary fields up to 14 T as well as the temperature dependencies of magnetic susceptibility were studied in the temperature range of 4.2 divided by 400 K. These results were compared with analogous measurements performed earlier by the authors for the nonstoichiometric spinel family built of the same elements and obtained under the assumption of the valence of Sb ions equal to 5. From this comparison it follows that these two spinel series reveal significant differences: (1) The interval of possible concentrations of Sb ions in the obtained stoichiometric spinel samples under study is up to 1.0, whereas for the nonstoichiometric spinels is (0.30 divided by 0.48). (2) The corresponding intervals for the appearance of the spin glass states are: (0.2 divided by 1.0) and (0.30 divided by 0.48), whereas the freezing temperatures do not differ significantly. (3) The magnetization processes in the stoichiometric samples depend strongly on the Sb concentration, whereas in the nonstoichiometric samples they run very hardly.

• 出版日期2009-6-10