Elucidation for search of Dynamical Stripe in YBCO by Inelastic Neutron Scattering Method

非弹性中子散射法寻找YBCO动力条纹的阐明

• 批准号: 12440094
• 负责人: ENDOH Yasuo
• 金额: $ 9.54万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440094/
• 关键词: Neutron Scattering; Spin Excitation; High temperature superconductivity; YBCO; Single Crystal; 1dimensional dynamical structure (stripe); LSCO; ホール係数; 単結晶育成

We aimed to elucidate the basic mechanism of high temperature superconductiity (HTSC) in Cu oxide materials. According to our systematic neutron scattering investigations, one dimensional dynamical structure of 'stripe' state exists in the single layered hole doped LSCO. In order to search this unique 'stripe' in various superconducting Cu oxide materials, we made similar neutron scattering measurements of the typical HTSC compounds of YBCO. Oxygen control in this crystal is more problematic, since the local order of oxygen in CuO chains may, -create the change in the electronic structure in neighboring CuO_2 plane. Ca substitutiqn may be a promising method to solve this difficult problem for our investigation. As a result, we could not produce any large crystal of Ca doped YBCO necessary for neutron scattering experiments. Instead, we were succeeded in growing large, single domain, and high quality, optimum doped YBCO, and have made detailed inelastic neutron scattering measurements for the first time. Though we don't complete the data analysis, we could yield at least new experimental evidence which should revise the existing results in the major publication. We also develop a new experimental technique of phonon scattering by using the ultra high resolution synchrotron X-ray radiation method. At present we could produce the data showing, unambiguous phonon anomalies in LSCO in superconducting state and then extendto the similar measurements in YBCO. We expect that this method is only applicable experimental method for the scattering experiments of Ca doped YBCO, since the large single crystal has never been grown.

我们的目的是阐明氧化铜材料中高温超导（HTSC）的基本机制。根据我们系统的中子散射研究，单层空穴掺杂LSCO中存在“条带”态的一维动力学结构。为了在各种超导氧化铜材料中寻找这种独特的“条纹”，我们对 YBCO 的典型 HTSC 化合物进行了类似的中子散射测量。该晶体中的氧控制更成问题，因为 CuO 链中氧的局部有序可能会导致相邻 CuO_2 平面中电子结构的变化。对于我们的研究来说，钙替代可能是解决这个难题的一种有前途的方法。结果，我们无法生产中子散射实验所需的任何大的 Ca 掺杂 YBCO 晶体。相反，我们成功地生长了大型、单域、高质量、最佳掺杂的 YBCO，并首次进行了详细的非弹性中子散射测量。尽管我们没有完成数据分析，但我们至少可以产生新的实验证据，从而修改主要出版物中的现有结果。我们还利用超高分辨率同步加速器X射线辐射方法开发了一种新的声子散射实验技术。目前，我们可以产生显示超导态 LSCO 中明确的声子异常的数据，然后扩展到 YBCO 中的类似测量。由于从未生长过大单晶，因此我们预计该方法仅适用于 Ca 掺杂 YBCO 的散射实验。

项目成果

T.Matsumura, Y.Endoh et al.: "Observation of the antiferroquadrupolar order in DyB2C2 by resonant x-ray scatteirng"Phys. Rev. B. 65. 094420(10) (2002)

T.Matsumura、Y.Endoh 等人：“通过共振 X 射线散射观察 DyB2C2 中的反铁四极有序”。

K.Kojima, S.Tajima et al.: "Observation of new longitudinal and transverse Josephson plasma modes in the parallel magnetic fields : underdoped YBCO"J. Low Temperature Phys.. (in press).

K.Kojima、S.Tajima 等人：“平行磁场中新的纵向和横向约瑟夫森等离子体模式的观察：欠掺杂的 YBCO”J。

Y.Endoh,M.Arai and S.Tajima: "Advances in Superconductivity XII"Springer. 1128 (2000)

Y.Endoh、M.Arai 和 S.Tajima：“超导进展 XII”施普林格。

M.Matsuda, Y.Endoh et al.: "Static and dynamic spin correlation in the spin-glass phase of slightly doped La_<2-x>Sr_xCuO_4"Phys.Rev.B. 62(13). 9148-9154 (2000)

M.Matsuda、Y.Endoh 等人：“轻掺杂 La_<2-x>Sr_xCuO_4 的自旋玻璃相中的静态和动态自旋相关性”Phys.Rev.B。

S.Wakimoto, Y.Endoh et al.: "Systematic study of shot-range antiferromagnet order and the spin-glass state in lightly doped La_<2-x>Sr_xCuO_4"Phys.Rev.B. 62(5). 3547-3553 (2000)

S.Wakimoto、Y.Endoh 等人：“轻掺杂 La_<2-x>Sr_xCuO_4 中射程反铁磁体序和自旋玻璃态的系统研究”Phys.Rev.B。