Stripe order and metal-insulator transition in the two-dimensional layered Ni oxide

二维层状镍氧化物中的条带序和金属-绝缘体转变

• 批准号: 16540307
• 负责人: YOSHIZAWA Hideki
• 金额: $ 2.24万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540307/
• 关键词: strongly correlated electron systems; stripe ordering; spin state transition; 電荷秩序; スピン状態; フォノン異常

In this research, main efforts were focused on understanding the origin of the unique stripe order observed in high Tc cuprate superconductor and its isostructural material, a two-dimensional Ni oxide. To examine the universality of the stripe ordering in transition metal oxides, the Co and Mn oxides in the isostructural two-dimensional crystal family were selected to study with use of neutron diffraction technique. In particular, we succeeded to grow high quality single crystal samples of the two-dimensional cobaltate Pr_<2-x>Ca_xCoO_4, the chaqrge and spin order in these compounds were investigated in detail. For x > 1/2, the checkerboard-type charge order (CCO) was formed, and as the doping rate is increased, the disordering of the CCO was observed with a tendency of further metallic behavior. On the other hand, for x < 1/2, the CCO changes over to the stripe order. This changeover is accompanied with the spin state transition of the Co ion and detailed analysis revealed that the stripe order is formed by electrons in contrast to the hole stripes reported in cuprates and nickelates. This observation demonstrates that there is a hole-electron symmetry in the stripe ordering.

在这项研究中，主要的努力集中在理解的独特条纹秩序观察到的高Tc铜氧化物超导体和它的同构材料，一个二维的镍氧化物的起源。为了考察过渡金属氧化物条纹有序的普遍性，选择了同质二维晶体族中的Co和Mn氧化物，利用中子衍射技术进行了研究。特别是，我们成功地生长了二维钴酸盐Pr_ Ca_xCoO_4的高质量单晶样品<2-x>，并详细研究了这些化合物中的电荷和自旋序。当x &gt; 1/2时，形成了棋盘型电荷有序（CCO），随着掺杂率的增加，CCO的无序化趋势进一步向金属化方向发展。另一方面，对于x &lt; 1/2，CCO转换为条带顺序。这种转变是伴随着自旋状态的过渡的Co离子和详细的分析表明，条纹秩序形成的电子在铜酸盐和镍酸盐中报道的孔条纹。这一观察结果表明，有一个空穴-电子对称的条纹有序。

项目成果

Neutron diffraction study on the antiferromagnetic insulating ground state of beta- Na_<0.33>V_2O_5

β-Na_<0.33>V_2O_5反铁磁绝缘基态的中子衍射研究

• 发表时间: 2005
• 期刊: J.Phys.Soc.Jpn. 74
• 作者: Y Kobayashi;T.S.Naing;M.Suzuki;M Akimitsu;K.Asai;K.Yamada;J.Akimitsu;P.Manuel;J.M.Tranquada;G.Shirane;S.Nagaiほか;T.Onimaruほか;R.Kajimotoほか;F.Yeほか;S.Nagai et al.
• 通讯作者: S.Nagai et al.

Electronically smecticlike liquid-crystal phase in a nearly half-doped manganite

• DOI: 10.1103/physrevb.72.212404
• 发表时间: 2005-05
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Feng Ye;J. Fernandez-Baca;J. Fernandez-Baca;Pengcheng Dai;Pengcheng Dai;J. W. Lynn;H. Kawano-Furukawa;Hideki Yoshizawa;Y. Tomioka;Y. Tokura

Magnetic structure of TbMnO_3 by neutron diffraction

中子衍射分析 TbMnO_3 的磁性结构

• 发表时间: 2004
• 期刊: Phys.Rev.B 70
• 作者: Y Kobayashi;T.S.Naing;M.Suzuki;M Akimitsu;K.Asai;K.Yamada;J.Akimitsu;P.Manuel;J.M.Tranquada;G.Shirane;S.Nagaiほか;T.Onimaruほか;R.Kajimotoほか;F.Yeほか;S.Nagai et al.;T.Onimaru et al.;R.Kajimoto et al.;F.Ye et al.;M.Yokoyama et al.;S.Nagaiほか;T.Onimaruほか;R.Kajimotoほか;F.Yeほか;M.Yokoyamaほか;M.Yokoyamaほか;K.Ishizakaほか;R.Kajimoto et al.
• 通讯作者: R.Kajimoto et al.

Neutron scattering study on competition between hidden order and antiferromagnetism in U(Ru_<1-x>Rh_x)_2Si_2 (x=<0.05)

U(Ru_<1-x>Rh_x)_2Si_2 (x=<0.05)中隐序与反铁磁性竞争的中子散射研究

• 发表时间: 2004
• 期刊: J.Phys.Soc.Jpn. 73
• 作者: Y Kobayashi;T.S.Naing;M.Suzuki;M Akimitsu;K.Asai;K.Yamada;J.Akimitsu;P.Manuel;J.M.Tranquada;G.Shirane;S.Nagaiほか;T.Onimaruほか;R.Kajimotoほか;F.Yeほか;S.Nagai et al.;T.Onimaru et al.;R.Kajimoto et al.;F.Ye et al.;M.Yokoyama et al.;S.Nagaiほか;T.Onimaruほか;R.Kajimotoほか;F.Yeほか;M.Yokoyamaほか;M.Yokoyamaほか;K.Ishizakaほか;R.Kajimoto et al.;K.Ishizaka et al.;K.Ishizakaほか;R.Kajimotoほか;M.Yokoyamaほか
• 通讯作者: M.Yokoyamaほか

Observation of modulated quadrupolar structures in PrPb_3

PrPb_3 中调制四极结构的观察

• 发表时间: 2005
• 期刊: Phys.Rev.Lett. 94
• 作者: Babil P. K.;入江憲治;S. Lambilai;志和地弘信;豊原秀和;藤巻宏;T.Onimaru
• 通讯作者: T.Onimaru