MAGNETIC PHASE TRANSITION OF HELICAL CsCuCl3 IN HIGH MAGNETIC FIELD
MAGNETIC PHASE TRANSITION OF HELICAL CsCuCl3 IN HIGH MAGNETIC FIELD
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高磁场中螺旋 CsCuCl3 的磁相变
DOI：
10.1051/jphyscol:19888670
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
M. Motokawa
中科院分区：
文献类型：
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作者：
H. Nojiri;Y. Tokunaga;M. Motokawa
使用脉冲高磁场在低于TN的各种温度下测量CsCuC 13的磁化强度。当Ho // c时，磁化强度在12.5T处显示出小的跳跃，在1.1K时在31 T处显示出饱和，而当Holc时，在12 T左右显示出小的平台。这一结果与目前报道的其它三角晶格物质中的结果有很大不同，似乎是由于其它类型的无公度相变。六方ABX 3型化合物具有三角晶格结构，其中A = Rb，Cs，X = Cl，Br，B = Mn，Fe，Co，Ni，Cu.它们已经被研究了两个多世纪，但仍然存在一些有吸引力的问题。晶体结构的类型，磁矩沿着C链彼此强烈沿着耦合，因此这些化合物可以被认为是准一维磁体。链间交换作用通常比链内弱.由于c平面上的三角形网络，使得面内相互作用为反铁磁的磁矩发生挫挫，从而使自旋结构变得复杂。CsCuC 13是该类别121的材料之一。强链内铁磁交换相互作用J1。16.7 cm ~（-1）在TN = 10.6K以下沿着c轴形成几乎铁磁但低螺距的螺旋自旋结构。这被认为是由于反对称的Dzyaloshinsky-Moriya相互作用。在c平面上，由于弱的反铁磁链间相互作用J ~ 2 = 2.7cm ~（-1），系统呈现120'结构。由于D-M相互作用，磁矩位于平面内，其矢量平行于c轴，尽管偶极各向异性显然使自旋更倾向于指向c轴。
Magnetization measurements of CsCuC13 is performed using pulsed high magnetic fields at various temper- atures below TN. Magnetization shows a small jump at 12.5 T and saturation at 31 T at 1.1 K when Ho // c, while a small plateu at around 12 T when Holc. The results are quite different from those reported so far in other triangular lattice substances and seem to be due to other type of incommensurate phase transition. Hexagonal ABX3 type compounds show compli- cated but interesting magnetic behaviors due to trian- gular lattice structure, where A = Rb, Cs, X = C1, Br and B = Mn, Fe, Co, Ni, Cu. They have been inves- tigated for more than two (l) but still remain some attractive problems. ype of crystal struc- ture, magnetic moments couple/each other strongly along the c-chain and then these compounds can be regarded as quasi-one dimensional magnets. The inter- chain exchange interaction is usually -weak compared to intrachain one. Because of the triangular network in the c-plane, the moments whose in-plane interaction is antiferromagnetic have frustration and then spin struc- ture becomes complicated. CsCuC13 is one of the materials of this category 121. Strong intrachain ferromagnetic exchange inter- action J1 .= 16.7 cm-' makes almost ferromagnetic but low pitch helical spin structure along the c-axis below TN = 10.6 K. This is considered to be due to the antisymmetric Dzyaloshinsky-Moriya interaction. In the c-plane, the-spin system shows a 120' structure caused by weak antiferromagnetic interchain interac- tion J2 = 2.7 cm-l. The magnetic moment lies in the plane due to D-M interaction whose vector is parallel to the c-axis, although dipolar anisotropy apparently makes spins prefer to direct to the c-axis.