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APS -2017 Annual Meeting of the APS Mid-Atlantic Section- Event - Synthesis and Magnetic Characterization of Double Perovskites

机译:APS -2017 APS中大西洋部分的年会 - 事件 - 双钙酯的合成和磁性表征

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Geometric magnetic frustration occurs when magnetic ions are arranged spatially such that magnetic order is inhibited. Frustrated materials are of interest to the research community due to their rich magnetic phase diagrams, exhibiting exotic physics and sensitivity to parameters such as doping and structural distortion. We have performed SQUID susceptibility measurements on the following 4$d^{mathrm{1}}$/5$d^{mathrm{1}}$ (Mo$^{mathrm{5+}}$/W$^{mathrm{5+}})$ double perovskite compounds: Ba$_{mathrm{2}}$YbMoO$_{mathrm{6}}$, Ba$_{mathrm{2}}$LuWO$_{mathrm{6}}$, Ba$_{mathrm{2}}$YWO$_{mathrm{6}}$, Ba$_{mathrm{2}}$ScMoO$_{mathrm{6}}$, and Sr$_{mathrm{2}}$ScMoO$_{mathrm{6}}$.Double perovskites exhibit frustration in the presence of antiferromagnetic correlations. In our measurements, all five compounds exhibited Curie-Weiss behavior with large and negative Curie-Weiss temperatures indicative of antiferromagnetic correlations. No evidence of magnetic order was found to 2K, indicating high frustration indices as seen in spin-singlet candidates such as Ba$_{mathrm{2}}$YMoO$_{mathrm{6}}$ and Ba$_{mathrm{2}}$LuMoO$_{mathrm{6}}$.
机译:当磁离子布置在空间上布置成使得磁性令被禁止时,发生几何磁挫伤。由于其丰富的磁相图,对研究界感到兴趣,因此对诸如掺杂和结构失真等参数的异国情调的物理学和敏感性。我们在以下4 $ d ^ {mathrm {mathrm {mathrm {mathrm {mathrm {mathrm {5 +}} $ / 5 $ d ^}} $(mo $ ^ {math}}上执行了鱿鱼敏感度测量。$ / w $ ^ {mathrm {5 +}})$ double perovskite化合物:ba $ _ {mathrm {2}} $ ybmoo $ _ {mathrm {6}} $,ba $ _ {mathrm {mathrm {2}} $ luwo $ _ {mathrm {6} $,ba $ _ {mathrm {2}} $ ywo $ _ {mathrm {6}} $,ba $ _ {mathrm {mathrm {mathrm {2}} $ scmoo $ _ {mathrm {mathrm {6}} $和sr $ _ { Mathrm {2}} $ SCMOO $ _ {MATHRM {6}} $。双重PEROVSKITES在存在反铁磁性相关情况下表现出挫折。在我们的测量中,所有五种化合物都表现出具有较大和负居里 - Weiss温度的Curie-Weiss行为,其指示反铁磁性相关性。没有发现磁性秩序的证据,表明在旋转单线候选者中看到的高令人沮丧的指数,例如Ba $ _ {mathrm {mathrm {mathrm {mathrm {mathrm {mathrm {mathrm {mathr _ {mathrm {mathrm { $ lumoo $ _ {mathrm {6}} $。

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