ACTA

Ferromagnetic Order in Single-Crystalline (Cd_xAl_y)[Cr₂]Se_z Semiconductors

H. Duda^a, P. Rduch^a, E. Malicka^b, T. Groń^a and J. Kusz^a
^aInstitute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
^bInstitute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland

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Measurements of the magnetic properties, the electrical conductivity and the Seebeck effect were performed on single crystals (Cd_xAl_y)[Cr₂]Se_z between 77 and 300 K. All samples have a ferromagnetic order with the Curie temperature of 130 K and the paramagnetic Curie-Weiss temperature of 155 K. Both these temperatures do not depend significantly on the Al substitution. The electrical conductivity of single crystals CdCr₂Se₄ doped with Al was p-type and showed the change of log σ versus 1/T slope above 150 K. This fact is interpreted as being due to the onset of impurity conduction and structural defects.

DOI: 10.12693/APhysPolA.119.702
PACS numbers: 72.80.Jc, 75.50.Pp, 75.50.Dd