Anomalous Correlations of Crystal Lattice, Magnetic and Electronic Properties in the Rare-Earth Cobaltites RCoO3 with Strong Fluctuations of Multiplicity
by
Sergei Ovchinnikov(Kirensky Institute of Physics, Russia)
→
Europe/Berlin
3.11 (AER19)
3.11
AER19
Description
We have investigated the x-ray diffraction (XRD) structure, magnetic susceptibility, and heat capacity of GdCoO3 in a wide temperature range. A model of phase separation of the low-spin (LS) and high-spin (HS) states has been proposed based on the analysis of XRD peak shape anomalies in the temperature range 200–800 K. From magnetic measurements we separated the HS Co3+ contribution and fitted it with the temperature dependent spin gap. We found a smooth LS-HS crossover at T = 800 K. The possible contribution of the intermediate spin (IS) state to the thermodynamics is excluded by the calculation IS-LS excitation energy within the modified crystal-field approach. In the two-phase model, with HS/LS probabilities calculated from the found spin gap and the LS and HS volumes calculated by the DFT-GGA method, we were able to reproduce the temperature dependence of the unit-cell volume and thermal expansion. Thus, we conclude that in GdCoO3 the main mechanism of the lattice expansion is not the conventional lattice anharmonicity, but the HS/LS multiplicity fluctuations. The electronic structure has been calculated by the LDA+GTB method. At zero temperature, we have obtained the charge-transfer insulator with the charge gap Eg = 0.5 eV. The thermal population of the HS term results in the in-gap band formation inside the insulator gap and smooth insulator-metal transition at TIMT = 780 K. Heat-capacity measurements revealed a smooth maximum near the TIMT.
