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arXiv 2102.07490cond-mat.str-el
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新型量子磁体BaCuTe $_2$ O $_6$的结构和磁性

Structural and magnetic properties of the new quantum magnet BaCuTe$_2$O$_6$

A. Samartzis, D. Khalyavin, A. T. M. N. Islam, S. Chillal, K. Siemensmeyer, K. Prokes, D. J. Voneshen, A. Senyshyn, B. Lake

摘要:

研究了新型量子磁体BaCuTe $_2$ O $_6$的结构和磁性.该化合物首次以粉末和单晶形式合成。同步辐射X射线和中子衍射揭示了立方晶体结构(P4 $_1$ 32),其中磁性Cu $^{2+}$离子形成复杂的网络。物理性质的测量表明,反铁磁相互作用的存在与居里-外斯温度为-33 K,而长程磁序发生在更低的温度约6.3 K。使用中子衍射解决的磁性结构,揭示了沿链平行于a,b和c晶轴的反铁磁顺序。这与自旋为1/2的海森堡反铁磁链的典型多自旋连续体的磁激发是一致的。从各种技术中获得了~ 34 K的一致的链内相互作用值。最后,磁结构提供的证据表明,链耦合在一起的非共线安排的一个弱得多的反铁磁,受挫hyperkagome相互作用。

英文摘要:

We investigate the structural and magnetic properties of the new quantum magnet BaCuTe$_2$O$_6$. This compound is synthesized for the first time in powder and single crystal form. Synchrotron X-ray and neutron diffraction reveal a cubic crystal structure (P4$_1$32) where the magnetic Cu$^{2+}$ ions form a complex network. Physical properties measurements suggest the presence of antiferromagnetic interactions with a Curie-Weiss temperature of -33K, while long-range magnetic order occurs at the much lower temperature of ~6.3K. The magnetic structure, solved using neutron diffraction, reveals antiferromagnetic order along chains parallel to the a, b and c crystal axes. This is consistent with the magnetic excitations which resemble the multispinon continuum typical of the spin-1/2 Heisenberg antiferromagnetic chain. A consistent intrachain interaction value of ~34K is achieved from the various techniques. Finally the magnetic structure provides evidence that the chains are coupled together in a non-colinear arrangement by a much weaker antiferromagnetic, frustrated hyperkagome interaction.

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