Microscopic Structural Condensed Matter Physics


Microscopic Structural Condensed Matter Physics Group 

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. 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:

"Quantitative measurement of structural fluctuation at LaNiO3/LaAlO3 interfaces as a function of thickness" 

K. Nagai, M. Anada, K. Kowa, M. Kitamura, H. Kumigashira, H. Tajiri, and Y. Wakabayashi

Phys. Rev. Materials 7, 043604 (2023).

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:

"Time-resolved resonant soft X-ray scattering combined with MHz synchrotron X-ray and laser pulses in the Photon Factory"

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:

"Microscopic observation of the effects of elongation on the polymer chain dynamics of crosslinked polybutadiene using quasi-elastic γ-ray scattering"

R. Mashita, M. Saito, Y. Yoda, H. Kishimoto, M. Seto and T. Kanaya

J. Synchrotron Rad. 29, 1180 (2022).

19 New publication:

"Light-induced magnetization driven by interorbital charge motion in the spin-orbit assisted Mott insulator α-RuCl3"

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 


1  Four students  joined our group.


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:

Early stages of iron passivation: defective growth of oxide layer observed by quick X-ray reflectometry

Y. Wakabayashi

Quasi-elastic Scattering:

Direct observation of molecular motions in soft materials: study of basic and applicational liquid crystal systems

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).

press release

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).

Apr. 2021

1  New members joined our group. Associate Prof. M. Saito, a PhD course student, and three under graduate students.  

Dec. 2020

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).

Nov. 2020

10  One of our works have selected in PF highlights 2019


Oct. 2020

7 New publication

"Structure of quasi-free-standing graphene on the SiC (0001) surface prepared by the rapid cooling method"

T. Sumi, K. Nagai, J. Bao, T. Terasawa, W. Norimatsu, M. Kusunoki, and  Y. Wakabayashi

Appl. Phys. Lett. 117, 143102 (2020).

June 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 

May 2020

29 New publication

"Direct Evidence of Simultaneous Reversal of Ferrimagnetically Coupled Sm 4f and Mn 3d Angular Momenta in SmMnO3"

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

"Tuning of ferrimagnetism and perpendicular magnetic anisotropy in NiCo2O4 epitaxial films by the cation distribution"

Y. Shen, D. Kan, Z. Tan, Y. Wakabayashi, and Y. Shimakawa

Phys. Rev. B 101, 094412 (2020).

9 New publication:

"Robust surface structure analysis with reliable uncertainty estimation using the exchange Monte Carlo method"

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).

Jan. 2020

23 New publication:

"Sub-molecular structural relaxation at a physisorbed interface with monolayer organic single-crystal semiconductors"

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). 

Oct. 2019

31  Selected in Photon Factory highlights 2018 

Sep. 2019

28 New publication:

"Insights into magnetoelectric-coupling mechanism of room-temperature multiferroic Sr3Co2Fe24O41 from domain observation"

H. Ueda, Y. Tanaka, Y. Wakabayashi, and T. Kimura, Phys. Rev. B, 100, 094444 (2019).

Jul. 2019

3-5   Instruments have finally arrived from Osaka. 

May 2019

22 New publication:

"Correlations between oxygen octahedral distortions and magnetic and transport properties in strained La0.5Sr0.5CoO3 thin films"

Y. Heo, D. Kan, M. Anada, Y. Wakabayashi, H. Tajiri, and Y. Shimakawa, 

Phys. Rev. B 99, 174420 (2019).


23  New publication:

"Kinetics of Iron Passivation Studied by Sub-Second Resolution Realtime X-ray Reflectivity Technique"

H.Fujii, Y.Wakabayashi, and T.Doi, 

J. Electrochem. Soc. 166, E212-E216 (2019).

Lab moved to Tohoku University.

Dec. 2018

New book has been published:

W.Voegeli and Y.Wakabayashi, Chapter 3, Surface/Interface holography, 3D Local Structure and Functionality Design of Materials, World Scientific Publishing (2018).

Oct. 2018

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:

"Observation of collinear antiferromagnetic domains making use of the circular dichroic charge-magnetic interference effect of resonant x-ray diffraction"

H.Ueda, Y.Tanaka, Y.Wakabayashi, and T.Kimura, Phys. Rev. B, 98, 134415 (2018).

Spt. 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)

Jul. 2018

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).

Jun. 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)

Apr. 2018

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).

Mar. 2018

27 New publication:

"Observation of Structure of Surfaces and Interfaces by Synchrotron X-ray Diffraction: Atomic-Scale Imaging and Time-Resolved Measurements"

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.

Nov. 2017

14 New publication:

"Non-destructive method for the determination of the electric polarization orientation in thin films: illustration on gallium ferrite thin films"

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).

Oct. 2017

23-26 Prof. Wakabayashi and Mr. Fujii attended ISSS-8(Tsukuba) to make their presentations.

23 New publication:

"Bayesian inference of metal oxide ultrathin film structure based on crystal truncation rod measurements"

M. Anada, Y. Nakanishi-Ohno, M. Okada, T. Kimura and Y. Wakabayashi, 

J. Appl. Cryst.  50 1611-1616 (2017).

reported by several news sites.

Jul. 2017

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. 

March 2017

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.


構造物性物理とX線回折 丸善出版 (2017). 

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