Department of Physics, Graduate School of Science, Tohoku University
We are doing structural condensed matter physics.
Origins of various properties of materials are examined
from atomic arrangements,
which are clarified by synchrotron x-ray diffraction.
What is the reason why we can learn the materials' property from the structure?
Think about the force F applied to an atom at position r.
F is the r-derivative of U, the total energy of the solid.
Let us assume the atomic position r is shifted a little.
If U increases, the displacement is pushed back，and
if U decreases, the displacement is enhanced.
U is affected not only by the elastic interaction,
but also by magnetism or other various electronic properties.
This is the reason why we can learn a lot from atomic arrangements.
Apr. 2025
1 We got new members. Dr. Takeshi Hara as an Assistant Professor, and two undergraduate students.
Mar. 2025
24 New publication:
"Non-destructive measurement of the charge transfer across LaMnO3/SrTiO3 interfaces"
S. Miyagawa, Y. Ishii, M. Anada, K. Nagai, M. Kitamura, H. Kumigashira, Y. Wakabayashi
J. Appl. Phys. 137, 125303 (2025).
Dec. 2024
6 Selected in Photon Factory Highlights 2023.
"Interchain Valence Correlation in Quasi-One-Dimensional Pt Complex Having 3D-Ligand Network"
Y.Wakabayashi, H.Sagayama, K.Otsubo and H.Kitagawa
2 New publication:
M.Saito, T.Araki, Y.Onodera, K.Ohara, M.Seto, Y.Yoda, and Y.Wakabayashi
Acta Mater. (online first) (2024).
Research news from Tohoku Univ. (English)
Nov. 2024
13 Imo-ni (traditional out-door activity in Tohoku-area, coocking at riverside in autumn.)
12 New publication:
"Non-ferroelectric phase with disappearance of cycloidal magnetic structure in Tb0.515Gd0.485Mn2O5"
Y.Ishii, T.Sakakura, Y.Ishikawa, R.Kiyanagi, L.Jana, T.Aoyama, K.Ohgushi, Y.Wakabayashi, H.Kimura, and Y.Noda
Phys. Rev. B 110, 184404 (2024). (Editors' suggestion)
4 New publication:
R.Morobishi, M. Kobayashi, H. Nishino, T. Nishiyama Hiraki, Y. Honjo, K. Kobayashi, Y. Joti, K. Ozaki, Y. Imai, M. Yamaga, T. Abe, N. Nagasawa, Y. Yoda, R. Mashita, T. Hatsui, Y. Wakabayashi, and M. Saito
Interactions 245, 349 (2024).
Oct. 2024
8 New publication:
R. Mashita, Y. Yoda, Y. Bito, H. Kishimoto, M. Seto, T. Kanaya. M.Saito
Interactions 245, 314 (2024).
Sep. 2024
30 Assistant Professor Yuta Ishii got new position at NIMS. Good luck!
Aug. 2024
30 New publication:
P. A. Praveen, T. Kanagasekaran, C. Ma, M. Terada, T. Jin, Y. Wakabayashi, and H. Shimotani
J. Mater. Chem. C 12, 15995-16003 (2024).
15 New publication:
F. Izumisawa, Y. Ishii, M. Kimura, T. Katase, T. Kamiya, J. Yamaura, and Y. Wakabayashi
J. Appl. Phys. 136, 075303 (2024).
Structure analyses on perovskite oxide thin film were performed using Bayesian inference.
July 2024
22 Mr. Xu (M2 student) presented his master's thesis. He will be a PhD-course student in our group.
15-18 Prof. Wakabayashi attends The 17th International Conference on Surface X-ray and Neutron Scattering (SXNS ).
6 New publication:
"Microscopic evaluation of orbital magnetic moment under ferromagnetic resonance"
Y. Ishii, Y. Yamasaki, Y. Kozuka, J. Lustikova, Y. Nii, Y. Onose, Y. Yokoyama, M. Mizumaki, J. Adachi, H. Nakao, T. Arima, and Y. Wakabayashi
Scientific Reports 14, 15504 (2024).
Time-resolved XMCD reveals precession in spin and orbital angular moment.
June 2024
26 New publication:
R. Mashita, M. Saito, Y. Yoda, N. Nagasawa, Y. Bito, T. Kikuchi, H. Kishimoto, M. Seto, and T. Kanaya
ACS Macro Lett. 13, 847–852 (2024).
Anisotropy in relaxation process found in strained rubber was reported.
18 New publication:
M. Saito, M. Kobayashi, H. Nishino, T. Nishiyama Hiraki, Y. Honjo, K. Kobayashi, Y. Joti, K. Ozaki, Y. Imai, M. Yamaga, T. Abe, N. Nagasawa, Y. Yoda, R. Mashita, T. Hatsui, and Y. Wakabayashi
Phys. Rev. Lett. 132, 256901 (2024).
A new method to observe nano-second atomic dynamics using x-ray frequency comb is reported.
May 2024
17 New publication:
"Recent advances in atomic resolution three-dimensional holography"
H. Daimon, T. Matsushita, F. Matsui, K. Hayashi, and Y. Wakabayashi
Advances in Physics: X, 9(1), 2350161-1-29 (2024). (Review article)
Apr. 2024
1 We got three new members.
Feb. 2024
9 New publication:
"A Three-Dimensionally Extended Metal–Organic Ladder Compound Exhibiting Proton Conduction"
H. Liang, K. Otsubo, Y. Wakabayashi, H. Sagayama, S. Kawaguchi, H. Kitagawa
Angew. Chem. Int. Ed. 2024, e202400162 (2024).
May 2023
20 Dr. Praveen joined our group as a PD researcher of Shimotani-group to develop organic laser devices.
Apr. 2023
26 New publication:
K. Nagai, M. Anada, K. Kowa, M. Kitamura, H. Kumigashira, H. Tajiri, and Y. Wakabayashi
Phys. Rev. Materials 7, 043604 (2023).
3 Four new undergraduate students joined our group.
Mar. 2023
29 Assistant Professor Yuta Ishii received Young Scientist Award of Society of Muon and Meson Science of Japan. Congratulations!
Jan. 2023
7 Assistant Professor Yuta Ishii received Young Scientist Award of Japanese Society of Synchrotron Radiation Research. Congratulations!
Oct. 2022
11 New member, Xuhui Xu joined our group.
7 New publication:
R. Fukaya, J. Adachi, H. Nakao, Y. Yamasaki, C. Tabata, S. Nozawa, K. Ichiyanagi, Y. Ishii, H. Kimura and S. Adachi
J. Synchrotron Rad. 29, (2022).
Aug. 2022
28 New publication:
R. Mashita, M. Saito, Y. Yoda, H. Kishimoto, M. Seto and T. Kanaya
J. Synchrotron Rad. 29, 1180 (2022).
19 New publication:
T. Amano, Y. Kawakami, H. Itoh, K. Konno, Y. Hasegawa, T. Aoyama, Y. Imai, K. Ohgushi, Y. Takeuchi, Y. Wakabayashi, K. Goto, Y. Nakamura, H. Kishida, K. Yonemitsu, and S. Iwai
Phys. Rev. Research 4, L032032 (2022).
May 2022
26 New publication:
"Phonon dispersion of the organic semiconductor rubrene"
K.Takada, K.Yoshimi, S.Tsutsui, K.Kimura, K.Hayashi, I.Hamada, S.Yanagisawa, N.Kasuya, S.Watanabe, J.Takeya, and Y.Wakabayashi
Phys. Rev. B 105, 205205 (2022). Editors’ Suggestion
Apr.2022
1 Four students joined our group.
Mar.2022
17 We had an earthquake last night (M7.3, 100km away), but we are OK.
Jan. 2022
28 New publication:
"Microscopic observation of hidden Johari-Goldstein-β process in glycerol"
Makina Saito, Masayuki Kurokuzu, Yoshitaka Yoda, and Makoto Seto
Phys. Rev. E 105, L012605 (2022).
21 New publication:
"Topological charge of soft X-ray vortex beam determined by inline holography"
Yuta Ishii, Hironori Nakao, Masaichiro Mizumaki, Yusuke Wakabayashi, Taka-hisa Arima, and Yuichi Yamasaki
Scientific Reports 12, 1044 (2022).
Dec. 2021
13 New publication:
"Effect of silica-nanoparticle fillers on the Johari-Goldstein-β process in polymer nanocomposites"
M. Saito, R. Mashita, T. Kanaya, H. Kishimoto, Y. Yoda, M. Seto
Hyperfine Interact. 242, 58 (2021).
Nov. 2021
5 Our work is selected in Photon Factory Highlights 2020.
Soft X-ray Vortex Beam Detected by Inline Holography
Y. Ishii
Aug. 2021
26 2 articles are published in SPring-8/SACLA Research Frontiers 2020
Solid-liquid Interface:
Y. Wakabayashi
Quasi-elastic Scattering:
M. Saito
23-25 We had an admission exam for the graduate school.
12 New publication:
"Relationship between Viscosity and Acyl Tail Dynamics in Lipid Bilayers"
M. Nagao, E. G. Kelley, A. Faraone, M. Saito, Y. Yoda, M. Kurokuzu, S. Takata, M. Seto, and P. D. Butler
Phys. Rev. Lett. 127, 078102 (2021).
9 New publication:
"Local polarization and valence distribution in LaNiO3/LaMnO3 heterostructures"
M. Anada, S. Sakaguchi, K. Nagai, M. Kitamura, K. Horiba, H. Kumigashira, and Y. Wakabayashi
Phys. Rev. B, 104, 085111 (2021).
Interfacial structure and valence distribution was examined for a few unit cell thick films of LaNiO3/LaMnO3.
Jul. 2021
21 New publication:
"Spin reorientation in tetragonally distorted spinel oxide NiCo2O4 epitaxial films"
H. Koizumi, I. Suzuki, D. Kan, J. Inoue, Y. Wakabayashi, Y. Shimakawa, H. Yanagihara
Phys. Rev. B 104, 014422 (2021).
Collaboration with Yanagihara lab, Tsukuba Univ. We did low-temperature X-ray diffraction.
May 2021
7 New publication:
"Laser oscillation of an organic distributed-feedback laser at the edge of a mini stopband"
T.Miura, T. Kanagasekaran, H.Shimotani, and K. Tanigaki
Appl. Phys. Express 14 052007 (2021).
1 New members joined our group. Associate Prof. M. Saito, a PhD course student, and three under graduate students.
24 New publication
“Soft-X-Ray Vortex Beam Detected by Inline Holography"
Yuta Ishii, Kohei Yamamoto, Yuichi Yokoyama, Masaichiro Mizumaki, Hironori Nakao, Taka-hisa Arima, and Yuichi Yamasaki
Phys. Rev. Applied 14, 064069 (2020).
17 New publication
"Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant"
K. Yoshimatsu, N. Hasegawa, Y. Nambu, Y. Ishii, Y. Wakabayashi and H. Kumigashira
Scientific Reports 10, 22109 (2020).
7 New publication
T. Sumi, K. Nagai, J. Bao, T. Terasawa, W. Norimatsu, M. Kusunoki, and Y. Wakabayashi
Appl. Phys. Lett. 117, 143102 (2020).
30 New publication
“Electronic charge transfer driven by spin cycloidal structure"
Y. Ishii, S. Horio, Y. Noda, M. Hiraishi, H. Okabe, M. Miyazaki, S. Takeshita, A. Koda, K. M. Kojima, R. Kadono, H. Sagayama, H. Nakao, Y. Murakami, and H. Kimura
Phys. Rev. B 101 224436 (2020). Editors’ Suggestion
29 New publication
J.-S. Jung, T. Nakamura, Y. Wakabayashi and T. Kimura
J. Korean Phys. Soc. 76 904-910 (2020). (Highlight)
1 New members joined our group. Associate Prof. H. Shimotani and his graduate students, Assistant Prof. Y. Ishii, and three under graduate students.
25 2 PhDs and one Master of Engineering left our lab to the world.
11 New publication
Y. Shen, D. Kan, Z. Tan, Y. Wakabayashi, and Y. Shimakawa
Phys. Rev. B 101, 094412 (2020).
9 New publication:
K. Nagai, M. Anada, Y. Nakanishi-Ohno, M. Okada and Y. Wakabayashi
J. Appl. Cryst. 53 387-392 (2020).
3 New publication:
"Early stages of iron anodic oxidation: Defective growth and density increase of oxide layer"
Hiromasa Fujii, Yusuke Wakabayashi, and Takashi Doi
Phys. Rev. Materials 4, 033401 (2020).
23 New publication:
A. Yamamura, H. Fujii, H. Ogasawara, D. Nordlund, O. Takahashi, Y. Kishi, H. Ishii, N. Kobayashi, N. Niitsu, B. Blülle, T. Okamoto, Y. Wakabayashi, S. Watanabe, and J. Takeya
Commun Phys 3, 20 (2020).
31 Selected in Photon Factory highlights 2018
28 New publication:
H. Ueda, Y. Tanaka, Y. Wakabayashi, and T. Kimura, Phys. Rev. B, 100, 094444 (2019).
3-5 Instruments have finally arrived from Osaka.
22 New publication:
Y. Heo, D. Kan, M. Anada, Y. Wakabayashi, H. Tajiri, and Y. Shimakawa,
Phys. Rev. B 99, 174420 (2019).
23 New publication:
H.Fujii, Y.Wakabayashi, and T.Doi,
J. Electrochem. Soc. 166, E212-E216 (2019).
Lab moved to Tohoku University.
New book has been published:
16 New publication:
"Surface structure of organic semiconductor [n]phenacene single crystals"
Y.Wakabayashi, M.Nakamura, K.Sasaki, T.Maeda, Y.Kishi, H.Ishii, N.Kobayashi, S.Yanagisawa, Y.Shimo, and Y.Kubozono,
J. Am. Chem. Soc. 140, 14046-14049 (2018).
11 New publication:
H.Ueda, Y.Tanaka, Y.Wakabayashi, and T.Kimura, Phys. Rev. B, 98, 134415 (2018).
14 New publication:
"Spin-Orbital Entangled Liquid State in the Copper Oxide Ba3CuSb2O9"
H. Man, M. Halim, H. Sawa, M. Hagiwara, Y. Wakabayashi and S. Nakatsuji,
J. Phys.: Condens. Matter (Topical Review)
15-19 Prof. Wakabayashi and four students attended International Surface X-ray and Neutron Scattering Conference (Pohang, Korea).
11 New publication:
"Spatial coherence of the insulating phase in quasi-two-dimensional LaNiO3 films"
M. Anada, K. Kowa, H. Maeda, E. Sakai, M. Kitamura, H. Kumigashira, O. Sakata, Y. Nakanishi-Ohno, M. Okada, T. Kimura and Y. Wakabayashi,
Phys. Rev. B, 98, 014105-1-8 (2018).
20 New publication:
"Oxygen octahedral distortions in compressively strained SrRuO3 epitaxial thin films"
D. Kan, M. Anada, Y. Wakabayashi, H. Tajiri, and Y. Shimakawa, J. Appl. Phys. 123, 235303 (2018). (Editor's pick)
26 New publication:
"Soft x-ray resonant diffraction study of magnetic structure in magnetoelectric Y-type hexaferrite"
H. Ueda, Y. Tanaka, Y. Wakabayashi, T. Kimura, Physica B, 536, 118–121 (2018).
12 New publication:
"Structural Switching of Self-Assembled Monolayer by External Electric Field"
H. Fujii, K. Sasaki, Y. Wakabayashi, H. Tajiri, K. Miwa, S. Ono, R. Nouchi,
e-J. Surf. Sci. Nanotech. 16 76-78 (2018).
27 New publication:
Y. Wakabayashi, T. Shirasawa, W. Voegeli, and T. Takahashi, J. Phys. Soc. Jpn. 87, 061010-1-12 (2018). (Review article)
22 Congratulations! Mr. Kazuki Nagai (B4) got a Dept. of Eng. Sci. Award.
14 New publication:
C. Lefevre, A. Demchenko, C. Bouillet-Ulhaq, M. Luysberg, X. Devaux, F. Roulland, G. Versini, S. Barre, Y. Wakabayashi, N. Boudet, C. Leuvrey, M. Acosta, C. Meny, E. Martin, S. Grenier, V. Favre-Nicolin and N. Viart,
Small Methods, 1, 1700234-1-8 (2017).
23-26 Prof. Wakabayashi and Mr. Fujii attended ISSS-8(Tsukuba) to make their presentations.
23 New publication:
M. Anada, Y. Nakanishi-Ohno, M. Okada, T. Kimura and Y. Wakabayashi,
J. Appl. Cryst. 50 1611-1616 (2017).
reported by several news sites.
24-28 Prof. Wakabayashi attended ICSOS-12 (Atlanta) to give a talk.
1st Prof. Tsuyoshi Kimura moved to Univ. of Tokyo, which makes Wakabayashi lab. started.
22nd Congratulations! Mr. Masato Anada (M2) got the department head prize.
19th One of Prof. Wakabayashi's papers (J. Phys. Soc. Jpn. 2007) receives The 22nd Outstanding Paper Award of the Physical Society of Japan.
15th Published a new paper:
“Structural deformation of the S=1 kagome-lattice compound KV3Ge2O9”
E. Takagi, T. Aoyama, S. Hara, H. Sato, T. Kimura, and Y. Wakabayashi,
Phys. Rev. B 95, 104416 (2017)
14th Congratulations! Mr. Masato Anada (M2) got a Poster prize at quantum beam science festa.
was written by Prof. Wakabayashi.
3D Local Structure and Functionality Design of Materials World Scientific
Chap. 3 was written by Prof. Wakabayashi.
Department of Physics, Graduate School of Science, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan