%0 Journal Article
%A Tas, M.
%A Şaşıoğlu, E.
%A Blügel, S.
%A Mertig, I.
%A Galanakis, I.
%T Ab initio calculation of the Hubbard U and Hund exchange J in local moment magnets: The case of Mn-based full Heusler compounds
%J Physical review materials
%V 6
%N 11
%@ 2475-9953
%C College Park, MD
%I APS
%M FZJ-2022-04138
%P 114401
%D 2022
%X Mn-based full Heusler compounds possess well-defined local atomic Mn moments, and thus the correlation effects between localized d electrons are expected to play an important role in determining the electronic and magnetic properties of these materials. Employing ab initio calculations in conjunction with the constrained random-phase approximation (cRPA) method, we calculate the strength of the effective on-site Coulomb interaction parameters (Hubbard U and Hund exchange J) in the case of X2MnZ full Heusler compounds with X being one of Ni, Pd, or Cu, and Z being one of In, Sn, Sb, or Te. We show that the Z element (or sp element) in Heusler compounds significantly reduces the strength of the Hubbard U parameter for Mn 3d electrons compared to the elementary bulk Mn. On the contrary, the effect of the sp atom on the strength of the U parameter of Ni, Cu, or Pd valence d electrons is not so substantial with respect to the elementary bulk values. The U values for all transition-metal atoms decrease with increasing sp electron numbers in the In-Sn-Sb-Te sequence. Our cRPA calculations reveal that despite their well-defined local magnetic moments, the Mn-based full Heusler alloys fall into the category of the weakly correlated materials.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000884781000003
%R 10.1103/PhysRevMaterials.6.114401
%U https://juser.fz-juelich.de/record/910786