[2] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE
来源:
PHYSICA B
|
1992年
/
180卷
关键词:
D O I:
10.1016/0921-4526(92)90720-D
中图分类号:
O469 [凝聚态物理学];
学科分类号:
070205 ;
摘要:
The polyoxometalate K10[Co4(H2O)2(PW9O34)2].20H2O contains a ferromagnetically exchange-coupled tetramer of Co(II) encapsulated in between two diamagnetic molecules (PW9O34)-9. At 2.5 K several inelastic peaks are observed in the energy range 1.5 7 meV, which are assigned to magnetic excitations in the cluster. A tentative interpretation of these data from an anisotropic exchange model yields a cobalt-cobalt interaction of 3 meV (24 cm-1) and an amount of anisotropy J(xy)/J(Z) congruent-to 0.6. These values are consistent with the magnetic susceptibility measurements.