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.

我们旨在阐明Cu氧化物材料中高温超导性（HTSC）的基本机制。根据我们系统的中子散射研究，单个分层孔掺杂的LSCO中存在“条纹”状态的一个维动力结构。为了在各种超导氧化物材料中搜索这种独特的“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。该晶体中的氧气控制更为有问题，因为Cuo链中的氧气局部顺序可能会引起相邻CUO_2平面中电子结构的变化。 CA替代可能是解决这一困难问题的有前途的方法。结果，我们无法产生任何用于中子散射实验所需的Ca掺杂YBCO的大晶体。取而代之的是，我们成功地发展了大型，单个领域和高质量的最佳掺杂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，以修改主要出版物中的现有结果。我们还使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状态下LSCO中明确的声子异常的数据，然后扩展到YBCO中的相似测量值。我们希望该方法仅是用于Ca掺杂YBCO的散射实验的适用实验方法，因为大型单晶从未生长。

项目成果

H.Kimura, Y Endoh et al.: "Incommesurate geometry of the elastic magnetic peaks in superconducting La_<1.88>Sr_<0.12>CuO_4"Phys.Rev.B. 61(21). 14366-14369 (2000)

H.Kimura、Y Endoh 等人：“超导 La_<1.88>Sr_<0.12>CuO_4 中弹性磁峰的不相称几何形状”Phys.Rev.B。

T.Muranaka, M.Ayai et al.: "Vibrational spectroscopy of MgB_2 by neutron inelastic scattering."J.Phys.Soc.Jpn., Suppl.. 71. 338-340 (2002)

T.Muranaka、M.Ayai 等：“中子非弹性散射的 MgB_2 振动光谱”。J.Phys.Soc.Jpn.，增刊 71. 338-340 (2002)

M.Limonov, H.Uchiyama, S.Tajima et al.: "Electron Raman Scattering In Heavily Overdoped (Y, Ca)Bcu3O7-d Crystals"Physica C. (accepted).

M.Limonov、H.Uchiyama、S.Tajima 等人：“重度过掺杂 (Y, Ca)Bcu3O7-d 晶体中的电子拉曼散射”Physica C.（已接受）。

H.Kimura, Y.Endoh et al.: "Neutron-Scattering Study of Incommensurate Elastic Magnetic Peaks in La2-xSrxCu1-yZnyO4(x〜0.21,y〜0.01)"J.Phys.Soc.Jpn.. 70Suppl.A. 52-54 (2001)

H.Kimura, Y.Endoh 等：“La2-xSrxCu1-yZnyO4(x〜0.21,y〜0.01)中不通约弹性磁峰的中子散射研究”J.Phys.Soc.Jpn.. 70Suppl.A. 52-54（2001）

H.Hiraka, Y.Endoh et al.: "Magnetic Diffuse Scattering in the CMR Manganite Sm0.55Sr0.45MnO3"J.Phys.Soc.Jpn.. 70Suppl.A. 88-90 (2001)

H.Hiraka、Y.Endoh 等人：“CMR 锰矿 Sm0.55Sr0.45MnO3 中的磁漫散射”J.Phys.Soc.Jpn.. 70Suppl.A。