2019
Volume 19, Number 3/4, pp. 56-60
Strong effect of multiplicity fluctuations in rare-earth cobaltites on magnetic, electronic and crystal structure properties
S.G. Ovchinnikov,1,4 Yu.S. Orlov,1,4 L.A. Solov'yov,2 S.Yu. Gavrilkin,3 A.Yu. Tsvetkov,3 D.A. Velikanov,1 M.V. Gorev,1,4 S.N. Vereshchagin2 and V.A. Dudnikov1
1 Kirensky Institute of Physics, FSC "KRSSB RAS", 660036 Krasnoyarsk, Russia
2 Institute of Chemistry and Chemical Technology, FSC "KRSSB RAS", 660036 Krasnoyarsk, Russia
3 Lebedev Physical Institute, RAS, 119991 Moscow, Russia
4 Siberian Federal University, 660041 Krasnoyarsk, Russia
The perovskite compounds ReCoO3-8 (where Re is Nd or Sm) have a number of unusual magnetic, electronic and lattice properties related to the temperature-induced spin state crossover from the low spin (LS) to the high spin (HS) states of the Co3+ ions. We have synthesized high quality polycrystalline samples and have measured the temperature dependence of X-ray diffraction, magnetic susceptibility, electrical resistivity and lattice dilatation. All observed anomalies are related to the smooth concentration increase of the HS ions that are excited over the spin gap between HS and LS terms.