Magnetic behaviour of doped dimer compounds Sr3Cr2−xMxO8 (M = V, Mn)
Department of Solid State Physics, Indian Association for the Cultivation of Science, 2A &
B Raja S. C. Mullick Road, 700
Received in final form: 28 October 2011
Published online: 11 January 2012
We report the effect of substitution of Cr by V and Mn in the spin- dimer compound Sr3Cr2O8. In the pentavalent Cr site, V ion has zero effective moment, while Mn remains in the spin-1 state. For both V and Mn substitutions, the gap in the spin excitation spectra remains almost unchanged in the dilute doping regime. The low temperature Curie tail, expected to be originated from free or quasi-free magnetic ions, is found to be larger in case of V doped samples. However, inter-dimer interaction is found to be stronger in the Mn doped samples. The underlying magnetic behaviour of these doped samples is presumably related to the effect of broken dimers due to random substitutions.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012