Competition of L21 and XA ordering in Fe2CoAl Heusler alloy: a first-principles study Aquil Ahmad, Amal K. Das and Sanjeev K. Srivastava Eur. Phys. J. B, 93 5 (2020) 96 Published online: 25 May 2020 DOI: 10.1140/epjb/e2020-100626-4