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Nmr Evidence For The Spin Gap Behavior In Cu_2po_4oh

机译:Cu_2po_4oh中自旋间隙行为的Nmr证据

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We report on the results of a ~(31)P nuclear-magnetic-resonance (NMR) study on Cu_2PO_4OH at temperatures between 4 and 300 K. This material has been a subject of current interest due to indications of spin gap behavior. The temperature-dependent NMR shift exhibits a character of low-dimensional magnetism with a broad maximum at T_(max)≈110 K. Below T_(max), the NMR shifts and spin-lattice relaxation rates clearly indicate activated responses, confirming the existence of a spin gap in Cu_2PO_4OH. The experimental NMR data can be well fitted to the square spin tetramer (SQST) model, yielding a spin gap size of about 140 K. It thus points out that the nearly isolated SQST picture is proper for the understanding of the spin gap nature in Cu-2PO_4OH.
机译:我们报告了Cu_2PO_4OH在4至300 K之间的温度下〜(31)P核磁共振(NMR)研究的结果。由于自旋间隙行为的迹象,该材料已成为当前关注的主题。随温度变化的NMR位移表现出低维磁性,在T_(max)≈110K处具有宽的最大值。低于T_(max)时,NMR位移和自旋晶格弛豫速率清楚地表明激活了响应,从而确认了存在Cu_2PO_4OH中自旋间隙的变化。实验NMR数据可以很好地拟合到方形自旋四聚体(SQST)模型,产生的自旋间隙大小约为140K。因此指出,几乎孤立的SQST图像适合于了解Cu中的自旋间隙性质-2PO_4OH。

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