Incommensurate structure of the spin-Peierls compound TiOCl in zero and finite magnetic fields
Incommensurate structure of the spin-Peierls compound TiOCl in zero and finite magnetic fields
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DOI：
10.1103/physrevb.73.172413
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发表时间：
2006-05-01
影响因子：
3.7
通讯作者：
Zimmermann, M. V.
中科院分区：
文献类型：
--
作者：
Krimmel, A.;Strempfer, J.;Zimmermann, M. V.
我们报告了非常规自旋 Peierls 化合物 TiOCl 的详细单晶 X 射线衍射研究。 TiOCl 中间相的特点是不相称的调制，这实际上与最近在同系物化合物 TiOBr 中发现的相同。自旋 Peierls 基态和不可通约相之间的一级相变在其晶体结构和磁化率方面揭示了相同类型的热滞现象。对于该相变，发现了微弱但显着的磁场效应，当沿链方向施加 B=10 T 的磁场时，场引起的转变温度变化为 Delta T-c1=-0.13 K。不相称晶体结构的场诱导变化与竞争链内和链间相互作用的情况相一致。
We report on a detailed single crystal x-ray diffraction study of the unconventional spin-Peierls compound TiOCl. The intermediate phase of TiOCl is characterized by an incommensurate modulation which is virtually identical to that recently found in the homologue compound TiOBr. The first order phase transition between the spin-Peierls ground state and the incommensurate phase reveals the same kind of thermal hysteresis in both its crystal structure and magnetic susceptibility. A weak, but significant magnetic field effect is found for this phase transition with a field induced shift of the transition temperature of Delta T-c1=-0.13 K for an applied field of B=10 T along the chain direction. The field induced changes of the incommensurate crystal structure are compatible with a scenario of competing intrachain and interchain interactions.