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.


June 2020

31 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).

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). (amazonでランキング1位)

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