Cs₂NaAl_1-xCr_x F₆: A family of compounds presenting magnetocaloric effect

S.S. Pedro, Julio Cesar Guimaraes Tedesco, F. Yokaichiya, P. Brandão, A.M. Gomes, S. Landsgesell, M.J.M. Pires, L.P. Sosman, A.M. Mansanares, M.S. Reis, Heloisa Nunes Bordallo