Structural Study of CuNCN and Its Theoretical Implications: A Case of a Resonating-Valence-Bond State?

Structural Study of CuNCN and Its Theoretical Implications: A Case of a Resonating-Valence-Bond State?
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CuNCN 的结构研究及其理论意义:以共振价键态为例?

DOI:
10.1021/jz301722b
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发表时间:
2012
影响因子:
5.7
通讯作者:
R. Dronskowski
R. Dronskowski
中科院分区:
化学2区
文献类型:
--
作者:
A. L. Tchougréeff;X. Liu;P. Müller;W. Van Beek;U. Ruschewitz;R. Dronskowski

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本文报道了含氮氧化铜类似物碳二亚胺铜(cucn)的高分辨率低温同步加速器结构研究结果。该材料明显表现出晶格参数随温度变化的惊人的非单调行为:在100k以下,其随温度的降低而减小,变为明显的增加。从磁化率来看,这一异常的起始温度与活化温度依赖的起始温度几乎一致,初步归因于形成了一个间隙的二维自旋液体(共振价键)态。根据这一假设,我们建立了一个将自旋磁化率的温度行为与晶格参数的温度行为联系起来的理论,该理论与观测到的行为半定量地一致。
We present the results of a high-resolution low-temperature synchrotron structural study of the nitrogen-containing analogue of cupric oxide, copper carbodiimide (CuNCN). The material clearly manifests a surprising nonmonotonous behavior of thealattice parameter as a function of the temperature: its decrease with decreasing temperature turns to a distinguishableincreasebelow 100 K. The onset temperature of this anomaly nearly coincides with that of the onset of the activation temperature dependence, as seen from the magnetic susceptibility, which has been tentatively attributed to the formation of a gapped 2D spin-liquid (resonating-valence-bond) state. In accord with this assumption, we develop a theory relating the temperature behavior of the spin susceptibility to that of the lattice parameter, which semiquantitatively agrees with the observed behavior.
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影响因子: 15
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