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首页> 外文期刊>Crystal growth & design >Crystal Growth of Spin Chain Compound Sr2CuO3 Doped with Quantum Defects: Zn, Co, Ni, and Mn
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Crystal Growth of Spin Chain Compound Sr2CuO3 Doped with Quantum Defects: Zn, Co, Ni, and Mn

机译：掺杂有Zn，Co，Ni和Mn的量子缺陷的自旋链化合物Sr2CuO3的晶体生长

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摘要

Single crystals of spin chain compound Sr2CuO3 and its doped variants consisting of Zn (1%), Co (1 and 2.5%), Ni (1 and 10%), and Mn (0.25%) at the Cu site were grown using the traveling solvent floating zone method. The floating zone at the end of each growth experiment was analyzed in detail to investigate the melt composition, the shape of the crystal melt interface, the region of the feed adjacent to the melt, and the dopant concentration of the melt. The composition of the molten zone was found to be in good agreement with the peritectic point associated with the incongruent decomposition of Sr2CuO3. The floating zones in each case were found to be extended deeply into the feed where its composition varied in accordance with the binary SrO-CuO phase diagram. Analysis of the dopant concentration revealed significant accumulation of Zn and Co in the floating zones, suggesting that the actual Zn/Co concentration in the grown crystals is less than the nominal value. No such accumulation was observed with Ni and Mn doping. Magnetic susceptibility of all the grown crystals was measured under two field orientations: parallel and perpendicular to the chains. We show that upon inclusion of a quantum defect in a spin 1/2 chain the magnetic ground state evolves in a manner that is characteristic of the quantum defect.
机译：通过移动生长了自旋链化合物Sr2CuO3的单晶及其在Zn位置由Zn（1％），Co（1和2.5％），Ni（1和10％）和Mn（0.25％）组成的掺杂变体。溶剂浮区法。每个生长实验结束时的浮动区都经过了详细分析，以研究熔体组成，晶体熔体界面的形状，与熔体相邻的进料区域以及熔体的掺杂剂浓度。发现熔融区的组成与与Sr2CuO3不一致分解有关的包晶点非常吻合。发现每种情况下的浮动区都深深地延伸到了进料中，在进料中其组成根据二元SrO-CuO相图而变化。对掺杂剂浓度的分析显示，Zn和Co在浮区中大量积累，表明生长的晶体中实际Zn / Co浓度小于标称值。用Ni和Mn掺杂没有观察到这种积累。在两个磁场方向下测量所有生长晶体的磁化率：平行和垂直于链。我们表明，在自旋1/2链中包含量子缺陷后，磁性基态以量子缺陷的特征方式演化。

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