arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.01036cond-mat.str-elcond-mat.mtrl-sci
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Y $_{3}$ Cu $_{9}$(OH)$_{19}$ Cl $_{8}$的强磁阻挫:一种畸变的可果美反铁磁体

Strong magnetic frustration in Y$_{3}$Cu$_{9}$(OH)$_{19}$Cl$_{8}$: a distorted kagome antiferromagnet

Pascal Puphal, Michael Bolte, Denis Sheptyakov, Andrej Pustogow, Kristin Kliemt, Martin Dressel, Michael Baenitz, Cornelius Krellner

摘要:

本文报道了$_{3}$ CuPDMATHABMN(OH)$_{19}$ Cl $_{8}$的晶体结构和磁性。在水热条件下生长Y $_{3}$ Cu $_{9}$(OH)$_{19}$ Cl $_{8}$的单晶。其结构由单晶X射线衍射确定,并由中子粉末衍射证实。所观察到的结构揭示了两个不同的Cu-位置,导致与密切相关的YCu $_{3}$(OH)$_{6}$ Cl $_{3}$相反的轻微变形的kagome层。居里-外斯行为在高温下的外斯温度$θ_{W}$的数量级的$-100$ K,显示出一个大的占主导地位的反铁磁耦合的kagome平面内。单晶比热和磁化强度的测量揭示了一个反铁磁转变T $_{N}=2.2$ K表示一个明显的挫折参数$θ_{W}/T_{N}\approx50$。粉末样品和单晶的光学透射实验证实了结构的发现。比热测量YCu $_{3}$(OH)$_{6}$ Cl $_{3}$下降到0.4 K证实了该系统的量子自旋液体状态。因此,这两个Y-Cu-OH-Cl化合物提出了一个独特的设置,以研究密切相关的结构与自旋液体状态和强烈受挫的AFM有序状态,通过稍微释放的挫折在一个kagome晶格。

英文摘要:

We present the crystal structure and magnetic properties of Y$_{3}$Cu$_{9}$(OH)$_{19}$Cl$_{8}$, a stoichiometric frustrated quantum spin system with slightly distorted kagome layers. Single crystals of Y$_{3}$Cu$_{9}$(OH)$_{19}$Cl$_{8}$ were grown under hydrothermal conditions. The structure was determined from single crystal X-ray diffraction and confirmed by neutron powder diffraction. The observed structure reveals two different Cu-positions leading to a slightly distored kagome layer in contrast to the closely related YCu$_{3}$(OH)$_{6}$Cl$_{3}$. Curie-Weiss behavior at high-temperatures with a Weiss-temperature $θ_{W}$ of the order of $-100$ K, shows a large dominant antiferromagnetic coupling within the kagome planes. Specific-heat and magnetization measurements on single crystals reveal an antiferromagnetic transition at T$_{N}=2.2$ K indicating a pronounced frustration parameter of $θ_{W}/T_{N}\approx50$. Optical transmission experiments on powder samples and single crystals confirm the structural findings. Specific-heat measurements on YCu$_{3}$(OH)$_{6}$Cl$_{3}$ down to 0.4 K confirm the proposed quantum spin-liquid state of that system. Therefore, the two Y-Cu-OH-Cl compounds present a unique setting to investigate closely related structures with a spin-liquid state and a strongly frustrated AFM ordered state, by slightly releasing the frustration in a kagome lattice.

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