Anisotropic thermal expansion and electronic transitions in the Co$_3$BO$_5$ ludwigite

ludwigite N.V. Kazak, A. Arauzo, J. Bartolomé, M.S. Molokeev, V.A. Dudnikov, L.A. Solovyov, А.A.Borus, S.G. Ovchinnikov 1Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia 2Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza and Departamento de Física de la Materia Condensada, 50009 Zaragoza, Spain 3Servicio de Medidas Físicas, Universidad de Zaragoza, 50009 Zaragoza, Spain 4Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russia 5Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia