Electrical and Magnetic Studies of the CdxCryVzSe4 Spinels
T. Grońa, H. Dudaa, E. Malickab, B. Zawiszab, J. Krok Kowalskia and A.W. Pacynac
a Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
b Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
c The Henryk Niewodniczański Institute of Nuclear Physics, E. Radzikowskiego 152, 31-342 Kraków, Poland
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The electrical and magnetic investigations carried out on the polycrystalline spinels with the general chemical formula CdxCryVzSe4 (where z = 0.06, 0.12, 0.24, and 0.31) revealed semiconducting and ferromagnetic properties with a Curie temperature of 127.5 K. A step like structure of the electrical conductivity, σ(T), was observed for the polycrystal containing 6% V ions in the octahedral sites while the remaining samples showed a typical Arrhenius behaviour of σ(T). These effects are interpreted in terms of ferromagnetic spin clusters which finally dissolve on going towards the paramagnetic limit including non stoichiometry.
DOI: 10.12693/APhysPolA.116.969
PACS numbers: 72.80.Jc, 75.50.Pp, 75.50.Dd