Investigation of a spin transition in a LaCoO3 single crystal by the method of X-ray magnetic circular dichroism at the cobalt K- and L2,3-edges by Sikolenko, V, Troyanchuk, I, Karpinsky, D, Rogalev, A, Wilhelm, F, Rosenberg, R, Prabhakaran, D, Efimova, E, Efimov, V, Tiutiunnikov, S, Bobrikov, I