Crystal field effect on the effective magnetic moment in A₂CoWO₆ (A = Ca, Sr and Ba)

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• 作者：C.A. Ló ; pez^a ; ^b ; M.E. Saleta^a ; ^b ; ^c ; J. Curiale^a ; ^b ; ^c ; R.D. Sá ; nchez^a ; ^b ; ^c ; ^{rodo@cab.cnea.gov.ar}
• 关键词：A.Oxides ; D. Magnetic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：May, 2012
• 卷：47
• 期：5
• 页码：1158-1163
• 文件大小：620 K

摘要

We prepared the antiferromagnetic Ca₂CoWO₆, Sr₂CoWO₆ and Ba₂CoWO₆ double perovskites with different crystalline structures, which are monoclinic, tetragonal and cubic respectively. The crystalline structures affect the Co-O distances and the local octahedral symmetry. Magnetic susceptibility experiments were performed as a function of magnetic field and temperature. We found that the effective magnetic moment (渭_eff) of Co²⁺ is partially unquenched and we also found that 渭_eff increases with the average of Co-O distances that form the CoO₆ octahedra. A simple model associates the behavior of the effective magnetic moment with crystal field effects.