Polarized hard X-ray photoemission system with micro-positioning technique for probing ground-state symmetry of strongly correlated materials
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- 作者：Hidenori Fujiwara ; Sho Naimen ; Atsushi Higashiya ; Yuina Kanai ; Hiroshi Yomosa ; Kohei Yamagami ; Takayuki Kiss ; Toshiharu Kadono ; Shin Imada ; Atsushi Yamasaki ; Kouichi Takase ; Shintaro Otsuka ; Tomohiro Shimizu ; Shoso Shingubara ; Shigemasa Suga ; Makina Yabashi ; Kenji Tamasaku ; Tetsuya Ishikawa and Akira Sekiyama
- 关键词：hard X-ray photoemission ; linear dichroism ; strongly correlated electron systems ; phase retarder ; micro-focused X-rays ; sample monitoring system ; low-temperature double-axis manipulator
- 刊名：Journal of Synchrotron Radiation
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：23
- 期：3
- 页码：735-742
- 全文大小：1620K
- ISSN：1600-5775
文摘
An angle-resolved linearly polarized hard X-ray photoemission spectroscopy (HAXPES) system has been developed to study the ground-state symmetry of strongly correlated materials. The linear polarization of the incoming X-ray beam is switched by a transmission-type phase retarder composed of two diamond (100) crystals. The best value of the degree of linear polarization was found to be −0.96, containing a vertical polarization component of 98%. A newly developed low-temperature two-axis manipulator enables easy polar and azimuthal rotations to select the detection direction of photoelectrons. The lowest temperature achieved was 9 K, offering the chance to access the ground state even for strongly correlated electron systems in cubic symmetry. A co-axial sample monitoring system with long-working-distance microscope enables the same region on the sample surface to be measured before and after rotation. Combining this sample monitoring system with a micro-focused X-ray beam by means of an ellipsoidal Kirkpatrick–Baez mirror (25 µm × 25 µm FWHM), polarized valence-band HAXPES has been performed on NiO for voltage application as resistive random access memory to demonstrate the micro-positioning technique and polarization switching.