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arXiv 2112.03312cond-mat.str-el
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S = 1/2正方格子Heisenberg反铁磁体的随机性和阻挫

Randomness and Frustration in a S = 1/2 Square-Lattice Heisenberg Antiferromagnet

Ellen Fogh, Otto Mustonen, Peter Babkevich, Vamshi M. Katukuri, Helen C. Walker, Lucile Mangin-Thro, Maarit Karppinen, Simon Ward, Bruce Normand, Henrik M. Rønnow

摘要:

我们探讨了系列$S = 1/2$海森堡正方晶格化合物Sr $_2$ CuTe $_{1-x}$ W $_x$ O $_6$中随机性和磁阻挫之间的相互作用。用W代替Te会显著改变磁相互作用,从强最近邻到次最近邻反铁磁耦合。我们进行中子散射测量,以探测磁基态和激发范围内的$x$。我们提出了一个键无序模型,再现基态只有短程自旋相关的混合化合物。计算的中子衍射图和粉末光谱与测量数据吻合良好,并允许对未来的测量进行详细的预测。我们得出结论,淬火的随机性起着主要作用,在定义物理的Sr $_2$ CuTe $_{1-x}$ W $_x$ O $_6$挫折不太重要。

英文摘要:

We explore the interplay between randomness and magnetic frustration in the series of $S = 1/2$ Heisenberg square-lattice compounds Sr$_2$CuTe$_{1-x}$W$_x$O$_6$. Substituting W for Te alters the magnetic interactions dramatically, from strongly nearest-neighbor to next-nearest-neighbor antiferromagnetic coupling. We perform neutron scattering measurements to probe the magnetic ground state and excitations over a range of $x$. We propose a bond-disorder model that reproduces ground states with only short-ranged spin correlations in the mixed compounds. The calculated neutron diffraction patterns and powder spectra agree well with the measured data and allow detailed predictions for future measurements. We conclude that quenched randomness plays the major role in defining the physics of Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ with frustration being less significant.

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