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arXiv 0808.3596cond-mat.str-elcond-mat.mtrl-sci
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伊辛反铁磁体Dy2Ge2O7的磁热力学

Magnetothermodynamics of the Ising Antiferromagnet Dy2Ge2O7

X. Ke, M. L. Dahlberg, E. Morosan, J. A. Fleitman, R. J. Cava, P. Schiffer

摘要:

我们报告系统的低温测量的直流磁化强度,交流磁化率,和热容量的焦锗酸镝(Dy2Ge2O7)单晶和粉末样品。我们的结果证实了Dy_2Ge_2O_7是一种各向异性的反铁磁体。等温场依赖磁化强度和积分磁熵都表明Dy 3+离子表现为Ising类自旋,类似于烧绿石自旋冰材料中的自旋。单自旋和集体自旋弛豫现象似乎都导致这种材料的自旋冻结,这与自旋冰材料中的观察结果类似,表明这种现象可能对更广泛的磁性材料具有普遍性。

英文摘要:

We report systematic low temperature measurements of the DC magnetization, AC susceptibility, and heat capacity of dysprosium pyrogermanate (Dy2Ge2O7) single crystal and powder samples. Our results confirm that Dy2Ge2O7 is an anisotropic antiferromagnet. The isothermal field dependent magnetization and the integrated magnetic entropy both indicate that the Dy3+ ions behave as Ising-like spins, analogous to those in the pyrochlore spin ice materials. Both single-spin and collective spin relaxation phenomena appear to lead to spin freezing in this material, again in analogy to observations in the spin ice materials, suggesting that such phenomena may be generic to a broader class of magnetic materials.

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