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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Neel to spin-glass-like phase transition versus dilution in geometrically frustrated ZnCr_(2-2x)Ga_(2x)O_4
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Neel to spin-glass-like phase transition versus dilution in geometrically frustrated ZnCr_(2-2x)Ga_(2x)O_4

机译：Neel到类自旋玻璃的相变与几何受挫的ZnCr_（2-2x）Ga_（2x）O_4中的稀释

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摘要

ZnCr_2O_4 undergoes a first order spin-Peierls-like phase transition at 12.5 K from a cubic spin liquid phase to a tetragonal Neel state. [S.-H. Lee, C. Broholm, T. H. Kim, W. Ratcliff II, and S-W. Cheong, Phys. Rev. Lett. 84, 3718 (2000)]. Using powder diffraction and single crystal polarized neutron scattering, we determined the complex spin structure of the Neel phase. This phase consisted of several magnetic domains with different characteristic wave vectors. This indicates that the tetragonal phase of ZnCr_(2-2x)Ga_(2x)O_4 is very close to a critical point surrounded by many different Neel states. We have also studied, using elastic and inelastic neutron scattering techniques, the effect of nonmagnetic dilution on magnetic correlations in ZnCr_(2-2x)Ga_(2x)O_4 (x=0.05 and 0.3). For x=0.05, the magnetic correlations do not change qualitatively from those in the pure material, except that the phase transition becomes second order. For x=0.3, the spin-spin correlations become short range. Interestingly, the spatial correlations of the frozen spins in the x=0.3 material are the same as those of the fluctuating moments in the pure and the weakly diluted materials.
机译：ZnCr_2O_4在12.5 K处经历了从立方自旋液相到四方Neel状态的一阶自旋-Peierls状相变。 [S.-H. Lee C. Broholm，T.H。Kim，W.Ratcliff II和S-W。张物理牧师84，3718（2000）]。使用粉末衍射和单晶极化中子散射，我们确定了Neel相的复杂自旋结构。该相由具有不同特征波矢量的几个磁畴组成。这表明ZnCr_（2-2x）Ga_（2x）O_4的四方相非常接近被许多不同的Neel态包围的临界点。我们还使用弹性和非弹性中子散射技术研究了非磁性稀释对ZnCr_（2-2x）Ga_（2x）O_4中的磁性相关性的影响（x = 0.05和0.3）。对于x ＝ 0.05，除了相变变为二阶之外，磁相关与纯材料中的磁相关没有定性变化。对于x ＝ 0.3，自旋-自旋相关变为短程。有趣的是，x = 0.3物质中冻结自旋的空间相关性与纯物质和弱稀释物质中的动量的空间相关性相同。

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