Spin state transition in the ferromagnet Sr0.9Ce0.1CoO2.85

Mangalam, R.V.K. ; Pradhan, G.K. ; Narayana, Chandrabhas ; Sundaresan, A. (2008) Spin state transition in the ferromagnet Sr0.9Ce0.1CoO2.85 Solid State Communications, 146 (3-4). pp. 110-114. ISSN 0038-1098

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Official URL: http://doi.org/10.1016/j.ssc.2008.02.007

Related URL: http://dx.doi.org/10.1016/j.ssc.2008.02.007


The sample Sr0.9Ce0.1CoO2.85, prepared by a chemical method, has a cubic perovskite structure with lattice parameter, a=3.8368(2)Å. The effective magnetic moment obtained from temperature dependent paramagnetic susceptibility suggests that the cobalt ions, Co3+ (50%) and Co4+ (50%), are in the intermediate spin states (IS), Co3+ (t2g5eg1) and Co4+ (t2g4eg1). Further, this compound undergoes a ferromagnetic as well as a metal–metal transition at TC∼160TC∼160 K which coincides with a spin state transition of cobalt ions that is likely to be associated with the IS state of Co3+ (t2g5eg1) ions going to the low spin (LS) state (t2g6eg0) as inferred from the softening of infrared optical phonons.

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