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arXiv 1005.0435cond-mat.str-el
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平面3d 9/3d 8镍酸盐反铁磁有序的NMR证据

NMR evidence for antiferromagnetic order in a planar 3d9/3d8 nickelate

N. ApRoberts-Warren, A. Dioguardi, V. V. Poltavets, M. Greenblatt, N. J. Curro

摘要:

本文报道了La_4 Ni_3 O_8的La-139核磁共振(NMR)数据,表明在T_N ~ 105 K以下存在反铁磁有序。该化合物包含与高温超导体的氧化铜平面同构的二维NiO 2层。该化合物是值得注意的,因为形式上2Ni 1 + + Ni 2+的平均Ni价为1.33+,表明3d 9/3d 8电子构型。具有Ni 1+价态的镍氧化物是稀有且不稳定的,但可能提供高温超导性的新途径。La_4Ni_3O_8具有S=1/2Ni ~(1+)自旋的反铁磁序,类似于铜酸盐超导体的母体化合物。我们的数据清楚地揭示了与T_N以下的长程序的开始有关的戏剧性的光谱变化和低能反铁磁关联。

英文摘要:

We report La-139 Nuclear Magnetic Resonance (NMR) data in La4Ni3O8 which reveals the presence of antiferromagnetic order below T_N ~ 105 K. This compound contains two-dimensional layers of NiO2 that are isostructural to the copper oxide planes of the high temperature superconductors. This compound is remarkable because the average Ni valence of 1.33+ for formally 2Ni1+ + Ni2+ indicates a 3d9/3d8 electronic configuration. Nickel oxides with Ni1+ valence are rare and unstable, yet may provide new routes to high temperature superconductivity. La4Ni3O8, with antiferromagnetic order of S=1/2 Ni1+ spins, is analogous to the parent compounds of the cuprate superconductors. Our data clearly reveal dramatic spectral changes and low energy antiferromagnetic correlations associated with the onset of long range order below T_N.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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