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Investigation of ionic and anomalous magnetic behavior in CrSe2 using 8Li β-NMR

机译:使用8LIβ-NMR调查CRSE2中的离子和异常磁性行为

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We have studied a mosaic of 1T-CrSe _(2) single crystals using β-detected nuclear magnetic resonance of ~(8) Li from 4 to 300 K. We identify two broad resonances that show no evidence of quadrupolar splitting, indicating two magnetically distinct environments for the implanted ion. We observe stretched exponential spin lattice relaxation and a corresponding rate (1/ T _(1) ) that increases monotonically above 200 K, consistent with the onset of ionic diffusion. A pronounced maximum in 1/ T _(1) is observed at the low temperature magnetic transition near 20 K. Between these limits, 1/ T _(1) exhibits a broad minimum with an anomalous absence of strong features in the vicinity of structural and magnetic transitions between 150 and 200 K. Together, the results suggest ~(8) Li ~(+) site occupation within the van der Waals gap between CrSe _(2) trilayers. Possible origins of the two environments are discussed.
机译:我们已经研究了使用β-检测到的核磁共振的1T-CRSE _(2)单晶的马赛克,从4到300 K识别出两种广泛的共振,没有Quadrupolar分裂的证据,表明两个磁性植入离子的不同环境。我们观察到拉伸的指数旋转晶格弛豫和相应的速率(1 / t _(1)),其单调上高于200 k,与离子扩散的开始一致。在20k附近的低温磁性转变处观察到1 / t _(1)中的发音最大值。在这些限制之间,1 / t _(1)在结构附近具有异常缺乏强度的最低限度和磁性过渡在150到200k之间,结果表明〜(8)李〜(+)位点占领在CRSE _(2)三层之间的范德瓦尔差距内。讨论了两个环境的可能起源。

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