A high Seebeck coefficient (S), large electrical conductivity ({\sigma}), and reduced thermal ({\kappa}) are required to achieve a figure-of-merit (zT) in an ideal thermoelectric (TE) system, which is challenging single system due the interdependence of TE parameters. Composite approach promising manipulate In this study, properties (1-x)LaCoO3/(x)La0.7Sr0.3CoO3 (0.00 \leq x 0.05) composite dis...

We have investigated the Co-3d spin-orbital state in a thin film of perovskite LaCoO3 to clarify the origin of strain induced spontaneous magnetization (T(C)=94 K) by means of x-ray diffraction, optical spectroscopy, and magnetization measurements. A lattice distortion with the propagation vector (1/4 -1/4 1/4) and an anomalous activation of optical phonons coupled to Co-3d orbital are observed...

With a series of local-density approximation plus Hubbard U calculations, we have demonstrated that for lanthanum cobaltite LaCoO3 , the electric field gradient at the cobalt nucleus can be used as a fingerprint to identify the spin state of the cobalt ion. Therefore, in principle, the spin state of the cobalt ion can be unambiguously determined from nuclear magnetic resonance spectra. Our calc...

The preparation of cation-ordered thin films correlated oxides is great interest for both fundamental and applied research. scientific long-term vision strongly motivated by the perspective studying electronic correlations in condensed matter without presence chemical or quenched disorder. A promising material platform provides double perovskite A2BB’O6 bulk samples with different types B/B’ or...

Motivated by recent observation of magnetic field induced transition in LaCoO3 we study the effect of external field in systems close to instabilities towards spin-state ordering and exciton condensation. We show that, while in both cases the transition can be induced by an external field, temperature dependencies of the critical field have opposite slopes. Based on this result we argue that th...