Development of ultrahigh-resolution photoemission spectrometer and study of quasiparticles in high-temperature superconductors

超高分辨率光电子能谱仪研制及高温超导准粒子研究

• 批准号: 14102006
• 负责人: TAKAHASHI Takashi
• 金额: $ 69.97万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (S)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14102006/
• 关键词: high-temperature superconductor; photoemission spectroscopy; quasiparticles; superconducting gap; 反強磁性的相互作用; 角度分解光電子分光; フェルミ面; 高温超電導体

In order to clarify the origin of quasiparticles in high-temperature superconductors, we have constructed a new ultrahigh-resolution angle-resolved photoemission (ARPES) spectrometer at Tohoku University. The spectrometer consists of (1) electron-energy analyzer, (2) light source, (3) analysis chamber, and (4) sample preparation chamber. As for the analyzer, we have improved the electric stability of the hemispherical part and the electron lens system, and also performed accurate sensitivity calibration of the CCD camera and the two-dimensional photoelectron detector. As for the light source, we have constructed a double differential pumping system as well as a VUV-filter which can pass ultraviolet-ray from the He discharge lamp but completely blocks residual gasses from the lamp. As for the sample chamber, we have developed a variable-angle manipulator which can rotate the angle with respect to the analyzer at low temperature. To effectively perform the ARPES experiment, we have devel … More oped a sample transfer system around the sample preparation chamber. To improve the vacuum during the measurement and to achieve low temperature, we have constructed multi-wall radiation shields with He-cycling cryostat. By making these efforts, we have finally achieved high performances as follows : (1) energy resolution : 1.3meV, (2) momentum resolution : 0.005Å^<-1>, (3) lowest temperature : 3.7K, and (4) vacuum during measurements : 2x10^<-11>Torr. By using this ultrahigh-resolution spectrometer, we have performed high-resolution ARPES measurements on following subjects.1)Observation of Fermi surface, superconducting gap, and pseudogap in Bi-based high-temperature superconductors.2)Direct observation of Bogoliubov quasiparticles on a triple-layered superconductor Bi2223.3)Elucidation of the origin of kink in the dispersion in hole-doped high-temperature superconductors.4)Direct observation of multiple-superconducting gaps in MgB_2.5)Observation of magnetic isotope effect in energy dispersion of Bi-based high-temperature superconductors.6)Direct observation of nonmonotonic d_x2_<-y2> wave superconducting gap in electron-doped high-temperature superconductors. Less

为了弄清高温超导体中准粒子的起源，我们在东北大学建造了一台新的超高分辨率角分辨光电子能谱仪（ARPES）。谱仪由（1）电子能分析器、（2）光源、（3）分析室和（4）样品制备室组成。在分析器方面，我们改进了半球部分和电子透镜系统的电稳定性，并对CCD相机和二维光电子探测器进行了精确的灵敏度校准。在光源方面，我们设计了一个双差动泵浦系统和一个真空紫外滤光片，该滤光片可以通过He放电灯发出的紫外线，但完全阻挡灯内的残余气体。对于样品室，我们开发了一种可变角度的机械手，它可以在低温下相对于分析仪旋转角度。为了有效地进行ARPES实验，我们开发了一种新的ARPES实验系统。 ...更多信息 在样品制备室周围安装了样品转移系统。为了提高测量过程中的真空度和实现低温，我们用氦循环低温恒温器构建了多壁辐射屏蔽。通过这些努力，我们最终获得了如下的高性能：（1）能量分辨率：1.3meV，（2）动量分辨率：0.005 μ π ι ^<-1>，（3）最低温度：3.7K，（4）测量时的真空度：2 × 10 ^<-11>Torr。利用这台超高分辨谱仪，我们进行了以下几个方面的高分辨ARPES测量：1）费米面、超导能隙、2）Bogoliubov准粒子在三层超导体Bi 2223上的直接观测; 3）解释空穴掺杂高温超导体中色散的扭结起源。4）直接观察到MgB_2中的多重超导能隙。5）Bi系高温超导体能量色散中的磁同位素效应观察。6）直接观察到<-y2>电子掺杂高温超导体中的非单调d_x_2波超导能隙。少

项目成果

Low energy excitation and scaling in Bi(2)Sr(2)Ca(n-1)Cu(n)O(2n+4) (n=1-3): angle-resolved photoemission spectroscopy.

• DOI: 10.1103/physrevlett.89.067005
• 发表时间: 2001-08
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: Takafumi Sato;Hiroshi Matsui;S. Nishina;Takashi Takahashi;T. Fujii;Takao Watanabe;A. Matsuda;A. Matsuda

Angle-resolved and resonant photoemission spectroscopy on heavy-fermion superconductors Ce2CoIn8 and Ce2RhIn8

• DOI: 10.1103/physrevb.71.224516
• 发表时间: 2005-06
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: S. Raj;Y. Iida;S. Souma;Takafumi Sato;T. Takahashi;H. Ding;S. Ōhara;T. Hayakawa;Genfu Chen;I. Sakamoto;H. Harima

Angle-resolved photoemission spectroscopy of the insulating NaxWO3: Anderson localization, polaron formation, and remnant Fermi surface.

• DOI: 10.1103/physrevlett.96.147603
• 发表时间: 2006-04
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: S. Raj;D. Hashimoto;H. Matsui;S. Souma;T. Sato;T. Takahashi;D. Sarma;P. Mahadevan;S. Oishi-S.-Ois

Momentum anisotropy of the scattering rate in cuprate superconductors

• DOI: 10.1103/physrevb.71.014517
• 发表时间: 2004-04
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: A. Kaminski;H. Fretwell;H. Fretwell;M. Norman;M. Randeria;S. Rosenkranz;U. Chatterjee;U. Chatterjee;J. Campuzano;J. Campuzano;J. Mésot;Takafumi Sato;Takashi Takahashi;T. Terashima;M. Takano;K. Kadowaki;Z. Li;H. Raffy

Direct observation of non-monotonic d_x2_<-y>2-wave superconducting gap in the electron-doped high-T_c superconductor Pr_<0.89>LaCe_<0.11>CuO_4

电子掺杂高温超导体Pr_<0.89>LaCe_<0.11>CuO_4中非单调d_x2_<-y>2波超导能隙的直接观测

• 发表时间: 2005
• 期刊: Physical Review Letters 95
• 作者: K. Terashima;et. al.;N.Nakayama et al.;T.Arakane et al.;T.Sato et al.;S.Raj et al.;T.Sato et al.;H.Matsui et al.;K.Nakayama et al.;T.Arakane et al.;K.Nakayama et al.;Y.X.Xiao et al.;T.Arakane et al.;S.Raj et al.;N.Nakayama et al.;A.Kanigel et al.;K.Terashima et al.;K.Sugawara et al.;K.Sugawara et al.;K.Terashima et al.;H.Matsui et al.;T.Sato et al.;H.-B.Yang et al.;H.Matsui et al.;T.Takahashi et al.;S.Raj et al.;S.Raj et al.;T.Sato et al.;T.Sato et al.;T.Sato et al.;H.Matsui et al.
• 通讯作者: H.Matsui et al.