The antiferromagnetic phenomena of the Mn-F-Mn spin cluster in KZnF3:Mn2+ and KMgF3:Mn2+ systems have been studied based on the Girerd-Journaux-Kahn (GJK) model and the Heitler-London (HL) model respectively. For the Mn ... Mn distance R in the range 3.4 < R < 4.6 Angstrom, the values of the exchange interaction parameter J calculated with the GJK model are greater by a factor 2 similar to 3 than those with the HL model and the results of J(GJK) are in good agreement with the experimental findings. This means that the contribution of the excited charge-transfer configuration (CTC) is considerably important and the main physical mechanism of the antiferromagnetic characteristics in KZnF3:Mn2+ and KMgF3:Mn2+ can be attributed to the combined effect of the direct exchange and the superexchange interactions. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
部门归属
acad sinica, int ctr mat phys, shenyang 110015, peoples r china. sichuan univ, inst atom & mol phys, chengdu 610065, peoples r china. sichuan univ, dept phys, chengdu 610064, peoples r china. ccast, world lab, beijing 100080, peoples r china.;kuang, xy (reprint author), acad sinica, int ctr mat phys, shenyang 110015, peoples r china
X. Y. Kuang,K. W. Zhou. Study of antiferromagnetic interaction of Mn-P-Mn cluster in KMgF3 : Mn2+ and KZnF3 : Mn2+ systems[J]. Physics Letters A,1999,262(4-5):389-395.
APA
X. Y. Kuang,&K. W. Zhou.(1999).Study of antiferromagnetic interaction of Mn-P-Mn cluster in KMgF3 : Mn2+ and KZnF3 : Mn2+ systems.Physics Letters A,262(4-5),389-395.
MLA
X. Y. Kuang,et al."Study of antiferromagnetic interaction of Mn-P-Mn cluster in KMgF3 : Mn2+ and KZnF3 : Mn2+ systems".Physics Letters A 262.4-5(1999):389-395.
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