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Title: Exchange interactions of CaMnO3 in the bulk and at the surface
Authors: Keshavarz, S.
Kvashnin, Y. O.
Rodrigues, D. C. M.
Pereiro, M.
Di, Marco, I.
Autieri, C.
Nordström, L.
Solovyev, I. V.
Sanyal, B.
Eriksson, O.
Issue Date: 2017
Publisher: American Physical Society
Citation: Exchange interactions of CaMnO3 in the bulk and at the surface / S. Keshavarz, Y. O. Kvashnin, D. C. M. Rodrigues, et al. — DOI 10.1103/PhysRevB.95.115120 // Physical Review B. — 2017. — Vol. 95. — Iss. 11. — 115120.
Abstract: We present electronic and magnetic properties of CaMnO3 (CMO) as obtained from ab initio calculations. We identify the preferable magnetic order by means of density functional theory plus Hubbard U calculations and extract the effective exchange parameters (Jij's) using the magnetic force theorem. We find that the effects of geometrical relaxation at the surface as well as the change of crystal field are very strong and are able to influence the lower-energy magnetic configuration. In particular, our analysis reveals that the exchange interaction between the Mn atoms belonging to the surface and the subsurface layers is very sensitive to the structural changes. An earlier study [A. Filippetti and W. E. Pickett, Phys. Rev. Lett. 83, 4184 (1999)PRLTAO0031-900710.1103/PhysRevLett.83.4184] suggested that this coupling is ferromagnetic and gives rise to the spin-flip (SF) process on the surface of CMO. In our work, we confirm their finding for an unrelaxed geometry, but once the structural relaxations are taken into account, this exchange coupling changes its sign. Thus, we suggest that the surface of CMO should have the same G-type antiferromagnetic order as in the bulk. Finally, we show that the suggested SF can be induced in the system by introducing an excess of electrons. © 2017 American Physical Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85014852722
PURE ID: 1690877
ISSN: 24699950
DOI: 10.1103/PhysRevB.95.115120
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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