Singlet Ground State and Magnetic Interactions in New Spin Dimer System Ba3Cr2O8
Singlet Ground State and Magnetic Interactions in New Spin Dimer System Ba3Cr2O8
复制标题
DOI：
10.1143/jpsj.75.054706
复制
发表时间：
2006-04
影响因子：
1.7
通讯作者：
T. Nakajima;H. Mitamura;Y. Ueda
中科院分区：
文献类型：
--
作者：
T. Nakajima;H. Mitamura;Y. Ueda
我们成功地合成了Ba3Cr2O8，并对其晶体结构和磁性进行了研究。晶体结构由Ba2+和孤立的CrO43-四面体组成，磁性铬离子以稀有的Cr5+形式存在(3d1，S=1/2)。S=1/2化合物Ba3Cr2O8是一个具有二聚体起源的单重态基态的三维量子自旋系统。根据磁化率和高场磁化数据的分析，计算出激发带隙为Δ/kB=16.1K，二聚体内和分子间交换作用分别为J0/kB=25.0K和J‘/kB=7.7K。与类似的自旋二聚体化合物Ba3Mn2O8相比，Ba3Cr2O8具有更明显的传统分子内相互作用。
We have successfully synthesized Ba 3 Cr 2 O 8 and investigated its crystal structure and magnetic properties. The crystal structure consists of Ba 2 + cations and isolated CrO 4 3- tetrahedra; magnetic chromium ions exist as rare Cr 5 + (3 d 1 , S = 1/2). An S = 1/2 compound Ba 3 Cr 2 O 8 was found to be a three-dimensional quantum spin system with a singlet ground state of dimer origin. From the analysis of magnetic susceptibility and high-field magnetization data, excitation gap is evaluated as Δ/ k B = 16.1 K and intra- and interdimer exchange interactions are estimated as J 0 / k B = 25.0 K and J '/ k B = 7.7 K, respectively. Comparing with a similar spin dimer compound Ba 3 Mn 2 O 8 , Ba 3 Cr 2 O 8 has a more dominant intradimer interaction.