Study of antiferromagnetic interaction of Mn–F–Mn cluster in KMgF3:Mn2+ and KZnF3:Mn2+ systems

✍ Scribed by Kuang Xiao-Yu; Zhou Kang-Wei

• Book ID: 104337807
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 99 KB
• Volume: 262
• Category: Article
• ISSN: 0375-9601
• DOI: 10.1016/s0375-9601(99)00642-8

✦ Synopsis

The antiferromagnetic phenomena of the Mn-F-Mn spin cluster in KZnF :Mn 2q and KMgF :Mn 2q systems have been

Ž . studied based on the Girerd-Journaux-Kahn GJK model and the Heitler-London HL model respectively. For the Mn PPP Mn distance R in the range 3.4 -R -4.6 A, the values of the exchange interaction parameter J calculated with the Ž . GJK model are greater by a factor 2 ; 3 than those with the HL model and the results of J GJK are in good agreement with Ž . 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 KZnF :Mn 2q and 3 KMgF :Mn 2q can be attributed to the combined effect of the direct exchange and the superexchange interactions.