This work is supported by the United States Department of Energy under Grant DE-SC0014208 and by The National Science Foundation under Grant 1752997. We acknowledge the Coordinated Instrument Facility (CIF) of Tulane University for the support of various instruments. P. B. S. and L. Y. A. (theoretical calculations) were supported by the Russian Science Foundation (No. 17-72-20223). We are grateful to the supercomputer cluster provided by the Materials Modelling and Development Laboratory at NUST "MISIS" (supported via the Grant from the Ministry of Education and Science of the Russian Federation No. 14.Y26.31.0005) and to the Joint Supercomputer Center of the Russian Academy of Sciences.
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