Electron-Spin-Resonance Study of Exchange-Coupled Ni2+ Pairs in K2MgF4
Electron-Spin-Resonance Study of Exchange-Coupled Ni2+ Pairs in K2MgF4
复制标题
K2MgF4 中交换耦合 Ni2 对的电子自旋共振研究
DOI：
--
复制
发表时间：
1970
期刊：
影响因子：
--
通讯作者：
Y. Yamaguchi
中科院分区：
文献类型：
--
作者：
Y. Yamaguchi
用电子自旋共振（ESR）方法研究了K2 MgF 4中单个Ni 2+离子和交换耦合的Ni 2+离子对.由对共振线的位置确定了次近邻对的交换常数。在这对中，不同的总自旋状态充分混合的轴向晶体场，这是可比的交换相互作用。在1.6°K时，电子对的光谱可用自旋哈密顿量Dc来解释（S 1 z 2 + S 2 z 2）+ E c（S1 x 2 -S1 y 2 + S2 x 2 -S2 y 2）+ J（S1·S2）+ D d（S1·S2 - 3S1xS2x）+ g β H ·（S1 + S2），其中Dc =-0.425cm-1，Ec =-0.065cm-1，J = 0.400cm-1，g =2.28，计算的磁偶极相互作用Dd = 0.0127cm-1.对于1.6°K的单离子，在DsSz 2 + g β H · S中，Ds =-0.352cm-1，g =2.275.作为第四近邻对的交换相互作用常数进行了估计。
Electron-Spin-Resonance study of single Ni 2+ ions and exchange-coupled Ni 2+ pairs in K 2 MgF 4 has been made. The exchange constant of the second-nearest-neighbor pair has been determined form the positions of the pair resonance lines. In this pair, different total-spin states admix sufficiently by an axial crystal field which is comparable to the exchange interaction. At 1.6°K, the spectra of the pair have been explained by a spin Hamiltonian D c ( S 1 z 2 + S 2 z 2 )+ E c ( S 1 x 2 - S 1 y 2 + S 2 x 2 - S 2 y 2 )+ J ( S 1 · S 2 )+ D d ( S 1 · S 2 -3 S 1 x S 2 x )+ g β H ·( S 1 + S 2 ), where D c =-0.425 cm -1 , E c =-0.065 cm -1 , J =0.400 cm -1 , g =2.28 and a calculated magnetic-dipole interaction D d =0.0127 cm -1 . For the single ions at 1.6°K, D s =-0.352 cm -1 and g =2.275 in D s S z 2 + g β H · S . As estimation of the exchange interaction constants of the fourth-nearest-neighbor pair has been made.