Localized magnetic moments in metallic SrB6 single crystals

We acknowledge support from grant MAT2015-73914-JIN, from the Ministerio de Economia y Competividad of Spain. P F S R acknowledges support from the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20160085DR. Work by L.C. was supported by the U.S. DOE, Office of Basic Energy Sciences, Materials Sciences and Engineering Division.