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首页> 外文期刊>Applied Magnetic Resonance >Boundary effects in finite Heisenberg antiferromagnetic S=1 chains: Y-89 NMR in Y2BaNi1-xMgxO5
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Boundary effects in finite Heisenberg antiferromagnetic S=1 chains: Y-89 NMR in Y2BaNi1-xMgxO5

机译：有限的Heisenberg反铁磁S = 1链的边界效应：Y2BaNi1-xMgxO5中的Y-89 NMR

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By means of Y-89 nuclear magnetic resonance (NMR) spectra direct evidence of staggered magnetization induced by a uniform field has been obtained in the Heisenberg antiferromagnetic S = 1 chain Y2BaNi1-3MgxO5. A correspondence between the resonance lines and the lattice positions is established, providing an image of the alternating magnetic moments that develop around the Mg impurities at the chain boundaries. The amplitude of these moments is found to decrease exponentially from the edges. with a characteristic decay distance equal to the magnetic correlation length numerically evaluated for an infinite chain. While the magnetization pertaining to ions far from the boundaries behaves as in typical gapped systems, the edge spins exhibit an S = 1/2 Curie-like deviation. These results promote the NMR approach to access the spin-spin correlation function in antiferromagnetic quantum spin systems at finite temperatures. [References: 18]
机译：借助Y-89核磁共振（NMR）光谱，在Heisenberg反铁磁S = 1链Y2BaNi1-3MgxO5中获得了均匀磁场引起的交错磁化的直接证据。建立了共振线和晶格位置之间的对应关系，从而提供了在链边界处围绕Mg杂质形成的交变磁矩的图像。发现这些力矩的幅度从边缘开始呈指数下降。其特征衰减距离等于对无限链进行数字评估的磁相关长度。尽管与边界相距较远的离子的磁化行为与典型的带隙系统相同，但边缘自旋呈现出S = 1/2居里样偏差。这些结果促进了NMR方法在有限温度下访问反铁磁量子自旋系统中的自旋-自旋相关函数。 [参考：18]

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