Distance Dependence of the Mn-Mn Exchange Interaction in IV-VI Semimagnetic Semiconductors

• Authors: A. Łusakowski , M. Górska
• Languages of publication: EN

Abstracts

EN

In the present paper we calculate the exchange interaction between two manganese ions in IV-VI semiconductors with the rocksalt structure. The method of calculations is based on the fourth order perturbation theory with respect to hybridization between band states and localized d orbitals of Mn ions. This hybridization is described by three Harrison integrals: V_{pdσ},V_{pdπ}, and V_{sdσ}. The band states of IV-VI semiconductor are obtained from the semiempirical tight binding model built from s and p orbitals of cations and anions. The resulting exchange term in the Hamiltonian is of the form -Σ_{i,j=xyz}J_{ ij}Ŝ^1_iŜ^2_j, however nondiagonal terms of the exchange integral tensor J_{i≠j} are very small. The dependence of J_{ij} on the Mn-Mn distance is non-monotonic. We also discuss the influence of the local crystal deformations on the exchange integral.

Keywords

EN

71.70.Gm; 75.30.Hx

Discipline

• 71.70.Gm: Exchange interactions
• 75.30.Hx: Magnetic impurity interactions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2003
• Volume: 103
• Issue: 6
• Pages: 659-664

Dates

published

2003-06

received

2003-05-30

Contributors

author

A. Łusakowski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

M. Górska

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

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Identifiers

DOI

10.12693/APhysPolA.103.659