TY  - JOUR
AU  - Tas, M.
AU  - Şaşıoğlu, E.
AU  - Blügel, S.
AU  - Mertig, I.
AU  - Galanakis, I.
TI  - Ab initio calculation of the Hubbard U and Hund exchange J in local moment magnets: The case of Mn-based full Heusler compounds
JO  - Physical review materials
VL  - 6
IS  - 11
SN  - 2475-9953
CY  - College Park, MD
PB  - APS
M1  - FZJ-2022-04138
SP  - 114401
PY  - 2022
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000884781000003
DO  - DOI:10.1103/PhysRevMaterials.6.114401
UR  - https://juser.fz-juelich.de/record/910786
ER  -