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We report thermal-expansion, lattice-constant, and specific-heat data of theseries La_1-xA_xCoO_3 for 0<= x <= 0.30 with A = Ca, Sr, and Ba. For theundoped compound LaCoO_3 the thermal-expansion coefficient alpha(T) exhibits apronounced maximum around T=50K caused by a temperature-driven spin-statetransition from a low-spin state of the Co^{3+$ ions at low towards a higherspin state at higher temperatures. The partial substitution of the La^{3+} ionsby divalent Ca^{2+}, Sr^{2+}, or Ba^{2+} ions causes drastic changes in themacroscopic properties of LaCoO3. The large maximum in alpha(T) is suppressedand completely vanishes for x> 0.12. For A = Ca three different anomaliesdevelop in alpha(T) with further increasing x, which are visible inspecific-heat data as well. Together with temperature-dependent x-ray data weidentify several phase transitions as a function of the doping concentration xand temperature. From these data we propose an extended phase diagram forLa_1-xCa_xCoO_3.

Magnetic and structural transitions in La$_{1-x}A_{1-x}$CoO$_{3}$ ($A$ = Ca, Sr, and Ba)