小泉昭久

コイズミアキヒサ (Akihisa Koizumi)

基本情報

所属: 兵庫県立大学大学院理学研究科物質科学専攻物質機能解析学部門量子物性学分野准教授

学位: 博士（理学）(岡山大学)

J-GLOBAL ID: 200901062593359879
researchmap会員ID: 5000022858

研究キーワード

研究分野

自然科学一般 / 磁性、超伝導、強相関系 / 放射光、コンプトン散乱、磁気コンプトン散乱、X線磁気吸収、イメージング測定、重い電子系

経歴

学歴

- 1992年

岡山大学自然科学研究科

論文

Visual Indication of Electronic Structures in CeIn3 Depending on Temperature: A Compton Scattering Study

Akihisa Koizumi, Satoshi Tsutsui, Jumaeda Jatmika, Naruki Tsuji, Maki Tokii, Makoto Matsumoto, Takao Ebihara

Journl of the Physical Society of Japan 94 034704-1-034704-6 2025年3月査読有り筆頭著者
Visualizing the Kondo lattice crossover in YbRh2Si2 with Compton scattering

M. Güttler, K. Kummer, K. Kliemt, C. Krellner, S. Seiro, C. Geibel, C. Laubschat, Y. Kubo, Y. Sakurai, D. V. Vyalikh, A. Koizumi

Physical Review B 103(11) 2021年3月15日査読有り最終著者
Change of Electronic Structure Associated with Hidden Order Transition in URu2Si2 Studied by Compton Scattering Experiment

Akihisa Koizumi, Gaku Motoyama, Yasunori Kubo, Tomoo Yamamura, Yoshiharu Sakurai

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019) 30 011170 2020年3月19日査読有り筆頭著者
Electronic structure in heavy fermion compound Upd<inf>2</inf>Al<inf>3</inf> through directional Compton profile measurement

Akihisa Koizumi, Yasunori Kubo, Etsuji Yamamoto, Yoshinori Haga, Yoshiharu Sakurai

Journal of the Physical Society of Japan 88(3) 2019年査読有り筆頭著者
How the electronic structure in URu<inf>2</inf>Si<inf>2</inf> changes with temperature: A high-resolution Compton scattering study

Akihisa Koizumi, Yasunori Kubo, Gaku Motoyama, Tomoo Yamamura, Yoshiharu Sakurai

Journal of the Physical Society of Japan 87(6) 2018年査読有り筆頭著者
Cryogenic system for X-ray Compton scattering measurements of superfluid helium below 2 K

Hiroyuki Tanaka, Akira Yamaguchi, Akihisa Koizumi, Ikuto Kawasaki, Akihiko Sumiyama, Masayoshi Itou, Yoshiharu Sakurai

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 861 23-27 2017年7月21日査読有り
Visual understanding of the hidden-order transition in URu<inf>2</inf> Si<inf>2</inf> by high-resolution x-ray Compton scattering

Akihisa Koizumi, Yasunori Kubo, Gaku Motoyama, Tomoo Yamamura, Masayoshi Itou, Yoshiharu Sakurai

Physical Review B - Condensed Matter and Materials Physics 92(12) 2015年9月8日査読有り筆頭著者
Microscopic magnetic properties of an oxygen-doped Tb-Fe thin film by magnetic Compton scattering

Akane Agui, Tomoya Unno, Sayaka Matsumoto, Kousuke Suzuki, Akihisa Koizumi, Hiroshi Sakurai

Journal of Applied Physics 114(18) 2013年11月14日査読有り
Spin and orbital magnetization loops obtained using magnetic Compton scattering

M. Itou, A. Koizumi, Y. Sakurai

Applied Physics Letters 102(8) 2013年2月25日査読有り
F Electron contribution to the change of electronic structure in CeRu <inf>2</inf>Si<inf>2</inf> with temperature: A compton scattering study

A. Koizumi, G. Motoyama, Y. Kubo, T. Tanaka, M. Itou, Y. Sakurai

Physical Review Letters 106(13) 2011年3月28日査読有り筆頭著者
25pGAB-10 レーザ・コンプトン散乱ガンマ線源のエネルギー可変性と偏極度(25pGAB 放射光・X線源・テラヘルツ光,ビーム物理領域)

宮本修治, 堀川賢, 戸中大輔, 北川靖久, 天野壯, 橋本智, 坂井信彦, 望月孝晏, 小泉昭久, 高木芳弘, 長谷川尊之, 嶋達志, 今崎一夫, 李大治, 大熊春夫

日本物理学会講演概要集 66.1.1 137 2011年
Spin dependent Compton scattering study of magnetic transitions in Ir doped CeFe<inf>2</inf>

B. L. Ahuja, B. K. Sharma, V. Purvia, S. Tiwari, A. Koizumi, T. Nagao, Y. Sakurai, N. Sakai

Journal of Applied Physics 108(4) 2010年8月15日査読有り
Experimental Study on Interlayer Magnetic Coupling in Sputtered Al/Fe/Al/Gd Magnetic Multilayer Films: II. Hysteresis Curves of X-ray Magnetic Circular Dicroism at the Gd-L-3 Edge

Sakai Nobuhiko, Chai-Ngam Ritthikrai, Koizumi Akihisa, Kobayashi Hisao

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79(6) 2010年6月査読有り
Perpendicular magnetic anisotropy in Co/Pt multilayers studied from a view point of anisotropy of magnetic Compton profiles

M. Ota, M. Itou, Y. Sakurai, A. Koizumi, H. Sakurai

Applied Physics Letters 96(15) 2010年4月査読有り
Role of oxygen electrons in the metal-insulator transition in the magnetoresistive oxide la 2-2 x Sr 1+2 x Mn 2O7 probed by compton scattering

B. Barbiellini, A. Koizumi, P. E. Mijnarends, W. Al-Sawai, Hsin Lin, T. Nagao, K. Hirota, M. Itou, Y. Sakurai, A. Bansil

Physical Review Letters 102(20) 2009年5月18日査読有り
Magnetic compton profile study of orbital ordering state of 3d electrons in YTiO<inf>3</inf>

Naruki Tsuji, Masahisa Ito, Hiroshi Sakurai, Kosuke Suzuki, Kei Tanaka, Kensuke Kitani, Hiromichi Adachi, Hiroshi Kawata, Akihisa Koizumi, Hironori Nakao, Youichi Murakami, Yasujiro Taguchi, Yoshinori Tokura

Journal of the Physical Society of Japan 77(2) 2008年2月査読有り
Momentum-density distribution of magnetic electrons in ferromagnetic nickel

Nagao Toshihiro, Kubo Yasunori, Koizumi Akihisa, Kobayashi Hisao, Itou Masayoshi, Sakai Nobuhiko

JOURNAL OF PHYSICS-CONDENSED MATTER 20(5) 2008年2月査読有り
Magnetic Compton scattering from ferromagnetic perovskite oxide YTiO3

Naruki Tsuji, Masahisa Ito, Hiroshi Sakurai, Kosuke Suzuki, Hiromichi Adachi, Hiroshi Kawata, Masayoshi Itou, Yoshiharu Sakurai, Akihisa Koizumi, Hironori Nakao, Youichi Murakami, Taguchi Yasujiro, Tokura Yoshinori

ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 64 C573-C573 2008年査読有り
Electron momentum density in the low-dimensional layered system ZrTe <inf>3</inf>

Yasunori Kubo, Yoshiharu Sakurai, Masayoshi Ito, Akihisa Koizumi, Kazuhiko Yamaya, Yoshiya Uwatoko

Journal of the Physical Society of Japan 76(6) 2007年6月査読有り
Perpendicular magnetic anisotropy in sputtered amorphous TbFeCo films

X. Liu, A. Morisako, H. Sakurai, Y. Sakurai, M. Itou, A. Koizumi

Journal of Magnetism and Magnetic Materials 310(2 SUPPL. PART 2) 1744-1746 2007年3月査読有り
Anisotropies of spin densities in metallic multilayers with perpendicular anisotropies

H. Sakurai, E. Murayama, M. Ota, K. Takano, F. Itoh, X. Liu, H. Kawata, H. Adachi, Y. Sakurai, M. Itou, A. Koizumi

Journal of Magnetism and Magnetic Materials 310(2 SUPPL. PART 3) 2710-2712 2007年3月査読有り
Perpendicular magnetic anisotropy in TbFeCo films studied by magnetic Compton scattering

H. Sakurai, M. Ota, X. Liu, A. Morisako, Y. Sakurai, M. Itou, T. Nagao, A. Koizumi

Journal of Applied Physics 102(1) 2007年査読有り
Anisotropies of magnetic Compton profiles in Co/Pd multilayer system

H. Sakurai, M. Ota, F. Itoh, M. Itou, Y. Sakurai, A. Koizumi

Applied Physics Letters 88(6) 2006年2月査読有り
Coexistence of polaronic and band states in a bilayer manganite from two-dimensional reconstruction of magnetic Compton profiles

Akihisa Koizumi, Toshihiro Nagao, Nobuhiko Sakai, Kazuma Hirota, Yoich Murakami

Physical Review B - Condensed Matter and Materials Physics 74(1) 2006年
Hole concentration dependence of Mn e<inf>g</inf> orbital state in bilayer manganites studied by magnetic Compton profile measurement

A. Koizumi, T. Nagao, Y. Kakutani, N. Hiraoka, N. Sakai, T. Arima, K. Hirota, Y. Murakami

Journal of Physics and Chemistry of Solids 66(12) 2183-2191 2005年12月
Temperature-dependent magnetic Compton scattering study of spin moments in Ce(Fe0.94Ru0.06)2

B. K. Sharma, V. Purvia, B. L. Ahuja, M. Sharma, P. Chaddah, S. B. Roy, Y. Kakutani, A. Koizumi, T. Nagao, A. Omura, T. Kawai, N. Sakai

Physical Review B - Condensed Matter and Materials Physics 72(13) 2005年10月1日
Experimental study on interlayer magnetic coupling in sputtered Al/Fe/Al/Gd magnetic multilayer films. I

Ritthikrai Chai-Ngam, Nobuhiko Sakai, Akihisa Koizumi, Hisao Kobayashi, Takehiko Ishii

Journal of the Physical Society of Japan 74(6) 1843-1848 2005年6月
A magnetic Compton scattering study of double perovskite Sr <inf>2</inf>FeMoO<inf>6</inf>

Y. Sakurai, A. Deb, M. Itou, N. Hiraoka, A. Koizumi, Y. Tomioka, Y. Tokura

Journal of Physics Condensed Matter 16(48) 2004年12月8日
Evidence of negative spin polarization in ferromagnetic Sr <inf>2</inf>FeMoO<inf>6</inf> as observed in a magnetic Compton profile study

Aniruddha Deb, N. Hiraoka, M. Itou, Y. Sakurai, A. Koizumi, Y. Tomioka, Y. Tokura

Physical Review B - Condensed Matter and Materials Physics 70(10) 2004年9月
Ru-O orbital hybridization and orbital occupation in SrRuO<inf>3</inf>: A magnetic Compton-profile study

N. Hiraoka, M. Itou, A. Deb, Y. Sakurai, Y. Kakutani, A. Koizumi, N. Sakai, S. Uzuhara, S. Miyaki, H. Koizumi, K. Makoshi, N. Kikugawa, Y. Maeno

Physical Review B - Condensed Matter and Materials Physics 70(5) 2004年8月
Change in Mn 3d orbital state related to a metal-insulator transition in a bilayer manganite studied by magnetic Compton profile measurement

A. Koizumi, T. Nagao, Y. Kakutani, N. Sakai, K. Hirota, Y. Murakami

Physical Review B - Condensed Matter and Materials Physics 69(6) 2004年2月10日
Verification of Ni magnetic moment in (formula presented) Laves phase by magnetic circular dichroism measurement

M. Mizumaki, K. Yano, I. Umehara, F. Ishikawa, K. Sato, A. Koizumi, N. Sakai, T. Muro

Physical Review B - Condensed Matter and Materials Physics 67(13) 2003年4月9日
Verification of Ni magnetic moment in GdNi<inf>2</inf> Laves phase by magnetic circular dichroism measurement

M. Mizumaki, K. Yano, I. Umehara, F. Ishikawa, K. Sato, A. Koizumi, N. Sakai, T. Muro

Physical Review B - Condensed Matter and Materials Physics 67(13) 1324041-1324044 2003年4月
Magnetic Compton profiles of Fcc-Ni, Fcc-Fe<inf>50</inf>Ni<inf>50</inf> and Hcp-Co

Yukinobu Kakutani, Yasunori Kubo, Akihisa Koizumi, Nobuhiko Sakai, B. L. Ahuja, B. K. Sharma

Journal of the Physical Society of Japan 72(3) 599-606 2003年3月
Element-specified observation of surface-influenced magnetization process in Gd/Fe multilayer

M Takagaki, A Koizumi, N Kawamura, M Suzuki, N Sakai

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 72(2) 245-248 2003年2月査読有り
Temperature-dependent magnetic Compton scattering study of spin moments in Ce(Fe<inf>0.96</inf>Ru<inf>0.04</inf>)<inf>2</inf>

B. L. Ahuja, T. Ramesh, B. K. Sharma, P. Chaddah, S. B. Roy, Y. Kakutani, A. Koizumi, N. Hiraoka, M. Toutani, N. Sakai, Y. Sakurai, M. Itou

Physical Review B - Condensed Matter and Materials Physics 66(1) 124111-124114 2002年7月1日
Study of the e(g) orbitals in the bilayer manganite La2-2xSr1+2xMn2O7 by using magnetic Compton-profile measurement

A Koizumi, S Miyaki, Y Kakutani, H Koizumi, N Hiraoka, K Makoshi, N Sakai, K Hirota, Y Murakami

PHYSICAL REVIEW LETTERS 86(24) 5589-5592 2001年6月査読有り
Temperature dependence of magnetic compton profile in DyCo<inf>5</inf>

Hayato Miyagawa, Yasuhiro Watanabe, Akihisa Koizumi, Nobuhiko Sakai, Masaichiro Mizumaki, Yoshiharu Sakurai, Tetsuya Nakamura, Susumu Nanao

Materials Research Society Symposium - Proceedings 658 GG5101-GG5106 2001年
Enhancement of the spin-dependent effect of π/2-angle Compton scattering using elliptically polarized synchrotron radiation

N. Sakai, M. Seigo, Y. Kakutani, N. Hiraoka, A. Koizumi

Journal of Synchrotron Radiation 7(5) 326-332 2000年9月1日
Anomalous magnetic hysteresis of Gd and Fe moments in a Gd/Fe multilayer measured by hard x-ray magnetic circular dichroism

A Koizumi, M Takagaki, M Suzuki, N Kawamura, N Sakai

PHYSICAL REVIEW B 61(22) 14909-14912 2000年6月査読有り
Performance of bent-crystal monochromators for high-energy synchrotron radiation

H. Yamaoka, N. Hiraoka, M. Ito, M. Mizumaki, Y. Sakurai, Y. Kakutani, A. Koizumi, N. Sakai, Y. Higashi

Journal of Synchrotron Radiation 7(2) 69-77 2000年3月1日
Sweep-rate effect on magnetic hysteresis in amorphous Tb<inf>60</inf>Fe<inf>20</inf>Al<inf>20</inf>

A. Koizumi, N. Sakai, S. Mitsudo, M. Motokawa

Journal of Magnetism and Magnetic Materials 177-181(PART 1) 211-212 1998年1月
X-Ray Magnetic Compton-Profile Measurements on SmCo<inf>5</inf> by Using Pulsed High Magnetic Field

Akihisa Koizumi, Nobuhiko Sakai, Nobuya Shirai, Masami Ando

Journal of the Physical Society of Japan 66(2) 318-321 1997年2月
Evidence for positive polarity of the spin moment in hcp Sm determined from a magnetic Compton-scattering experiment

Hiromichi Adachi, Hiromitsu Ino, Akihisa Koizumi, Nobuhiko Sakai

Physical Review B - Condensed Matter and Materials Physics 56(10) R5744-R5746 1997年
X-Ray Magnetic Form Factor of UTe

Masahisa Ito, Akihisa Koizumi, Fumitake Itoh, Hiroshi Sakurai, Yoshikazu Tanaka, Toru Ohata, Koichi Mori, Akira Ochiai, Hiroshi Kawata, Koichi Mori

Journal of the Physical Society of Japan 64(7) 2333-2337 1995年7月
Magnetic Compton Profiles of Ferromagnetic Intermetallic Compound MnSb

Takayoshi Takeda, Jin Nakamura, Kichizo Asai, Nobuyoshi Yamada, Yoshikazu Tanaka, Nobuhiko Sakai, Masahisa Ito, Akihisa Koizumi, Hiroshi Kawata

Journal of the Physical Society of Japan 64(4) 1385-1393 1995年
Magnetic moment and intensity of magnetic x-ray dichroism at the k-edge in fe73.6ni26.4 alloy

H. Sakurai, F. Itoh, H. Maruyama, H. Yamazaki, K. Kobayashi, A. Koizumi, H. Kawata

Japanese Journal of Applied Physics 32 329-331 1993年1月
X-ray magnetic circular dichroism and xanes spectra at pt l2, 3-edges in fe-pt alloys

Hiroshi Maruyama, Akihisa Koizumi, Kenji Kobayashi, Hitoshi Yamazaki

Japanese Journal of Applied Physics 32 290-294 1993年1月
Circular Magnetic X-Ray Dichroism at the K-Absorption Edge in Fe-Ni Alloys

Hiroshi Sakurai, Fumitake Itoh, Hiroshi Maruyama, Akihisa Koizumi, Kenji Kobayashi, Hitoshi Yamazaki, Yasunori Tanji, Hiroshi Kawata

Journal of the Physical Society of Japan 62(2) 459-463 1993年
X-ray resonance exchange scattering study of nd2fei4b

Akihisa Koizumi, Kazumichi Namikawa, Hiroshi Maruyama, Koichi Mori, Hitoshi Yamazaki

Japanese Journal of Applied Physics 32 332-334 1993年1月