ATSUKO NAKAYAMA

写真a

Affiliation

IWATE University  Faculty of Science and Engineering  Department of Physical Science and Materials Engineering  Studies in Mathematical Science and Physics 

Position

Professor
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Research Interests 【 display / non-display 】

  • Condensed Matter Physics

  • High Pressure Science

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Graduate School 【 display / non-display 】

  • 　
    -
    1996.03

    Tokyo Institute of Technology  Graduate School, Division of Science and Engineering  Chemistry  Doctor's Course  Completed

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Degree 【 display / non-display 】

  • Tokyo Institute of Technology -  Dr. Sci.  1996.03.31

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Campus Career 【 display / non-display 】

  • 2016.04
    -
    Now

    IWATE University   Faculty of Science and Engineering   Department of Physical Science and Materials Engineering   Studies in Mathematical Science and Physics   Professor   [Duty]

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External Career 【 display / non-display 】

  • 2007.04
    -
    2016.03

      Associate Professor  

  • 1994.04
    -
    1996.07

      Researcher  

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Research Areas 【 display / non-display 】

  • High Pressure Science

  • Nanotechnology/Materials / Functional solid state chemistry

  • Nanotechnology/Materials / Nanometer-scale chemistry

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Course Subject 【 display / non-display 】

  • 2016

    Advanced Nano-materials

  • 2016

    Advanced High Pressure Science and Technology

  • 2016

    Materials Science and Engineering Laboratory Ⅱ

  • 2016

    Thermodynamics

  • 2016

    Selected Topics in Materials Science Ⅱ

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Research Career 【 display / non-display 】

  • Densification of hydrogen using nano space of carbon π electron system

    Periods of research：

    2020.09
    -
    Now

    Keywords : Hydrogen, graphene, high pressure, Raman spectroscopy, phase transition, phonon

    Style of Research： Collaboration in Japan

    Research Program： Cooperative Research  

    Contents of Research Career

    In this study, we found that when solid H2 and multi-layer graphene coexist, a new vibrational state appears in addition to the original H2 phonons.
    In addition, since abnormalities in rotational vibration observed in liquid H2 may indicate a phase transition, we will proceed with the development of a high-pressure ultrasonic measurement method in order to promote multifaceted verification of the phase transition of liquid H2 in the future.

  • Study on vibrational state of supercritical fluid hydrogen

    Periods of research：

    2020.04
    -
    Now

    Keywords : Hydrogen, Supercritical fluid, High Pressure, Room Temperature, Vibration state, Raman Spectroscopy

    Style of Research： Collaboration in Japan

    Research Program： The Other Research Programs  

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Published Papers 【 display / non-display 】

  • Phase Transition in Fluid Hydrogen at Room Temperature

    Atsuko Nakayama, Yuya Isurugi, Yuya Serizawa, Satoshi Nakano, Ayako Ohmura, and Fumihiro Ishikawa

    Journal of the Physical Society of Japan ( The Physical Society of Japan )    2022.08  [Refereed]

    Bulletin of University, Institute, etc.  Single Work

    Rotational and vibration-rotational Raman spectra of !uid hydrogen (H2) at room temperature were investigated
    through Raman spectroscopy under pressure. All the rotational and vibration-rotational lines showed rapid pressure
    changes in Raman shifts at around 0.56 GPa. The peak analyses revealed that the ortho-para conversion of H2 was
    generated under pressure beyond 0.56 GPa at room temperature. Supposedly, that the anomalies obtained at 0.56 GPa at
    room temperature corresponded to a phase transition in !uid phase, inducing a signi"cant change in the ratio of
    equilibrium composition of ortho- and para-H2.

    DOI

  • New Phase in Fluid Hydrogen at Room temperature

    New Phase in Fluid Hydrogen at Room Temperature

    Research Square ( Research Square AJE LLC )    1 - 18   2021.07

    Others  Multiple authorship

    The presence of phase-transition in hydrogen (H2) at around 560 megapascal (MPa) and room temperature was clarified by Raman and x-ray diffraction studies on both pure H2 and graphite-H2 mixture. H2 is intercalated into the nano-space of graphite, which lowers the transition pressure and temporally expands the size of the honeycomb lattice of graphite under pressure up to 600 MPa. It is supposed that is caused by a gas-liquid phase-transition. According to the peak analysis for Q1(J) mode, the ortho-para conversion of H2 gradually begins to appear after the phase-transition pressure even at room temperature, while peak separation is difficult to achieve under pressure above 1.6 gigapascal (GPa) because of significant overlapping of the peak intensities. Because we have missed the ortho-para conversion which could be observed in only such a small pressure range, the fluid phase at room temperature was full of mystery.

    DOI

  • Nonmonotonic Pressure Dependence of the Lattice Parameter a in the Quasi-one-dimensional Superconductor Pr2Ba4Cu7O15-δ

    Haruka Taniguchi , Yuya Nakarokkaku , Riku Takahashi , Masatoshi Murakami , Atsuko Nakayama , Michiaki Matsukawa , Satoshi Nakano , Makoto Hagiwara , Takahiko Sasaki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( PHYSICAL SOC JAPAN )  90   015001-1 - 15001-2   2020.12  [Refereed]

    Academic Journal  Multiple authorship

    In the quasi-one-dimensional superconductor, Pr2Ba4Cu7O15−δ, we found that the lattice parameter, a increased against pressure, starting at 2.0 GPa at approximately 300 K. This result suggests that the two-dimensional inter-conducting-chain interaction along the a axis is most enhanced at approximately 2.0 GPa. To discuss the dimensionality, we also measured the resistance under magnetic fields up to 14 T, because magneto-resistance is induced when a system changes from one-dimensional to two-dimensional

    DOI

  • Transport and structural properties of Cu x Se1− x )3 (x = 0.01) under high pressure

    Ayako Ohmura1, Masako Matsuzawa, Fumihiro Ishikawa, Yusuke Suzuki, Masashi Komatsu, Shumpei Osuga, Satoshi Nakano, Atsuko Nakayama, Yuh Yamada, Takanari Kashiwagi, and Kazuo Kadowaki

    Japanese Journal od Applied Physics   56   05FB04-1 - 05FB04-4   2017.04  [Refereed]

    Bulletin of University, Institute, etc.  Multiple authorship

    Cu0.25Bi2(TexSe1-x)3 において、x=0.01の化合物を合成し、高圧下で電気抵抗測定、Ｘ線回折実験をおこなった。常圧下では、反磁性とTc=3.2Kの超伝導を示すが、1GPa以上では、Tcが見えなくなる。10GPa以上の加圧では、再び超伝導的な振る舞いを示し、Tc=4.3〜5.4Kを示す。また、構造相転移が10.9GPaで生じ、R-3mからC2/m構造に変化することがわかった。

  • Pressure-induced topological phase transition in the polar semiconductor BiTeBr

    Ayako Ohmura, Yuichiro Higuchi, Takayuki Ochiai, Manabu Kanou, Fumihiro Ishikawa, Satoshi Nakano, Atsuko Nakayama, Yuh Yamada and Takao Sasagawa

    PHYSICAL REVIEW B   95   125203-1 - 125203-7   2017.03  [Refereed]

    Bulletin of University, Institute, etc.  Multiple authorship

    BiTeBrの5GPaの圧力までのＸ線回折と電気抵抗測定をおこない、圧力誘起トポロジカル相転移について調べた。格子軸比a/cは、2.5〜3GPaで最小を示し、計算から、バンドギャップエネルギーが2.9GPaで一旦閉じて、高圧下で再び開くことがわかった。0GPaでは普通の絶縁体であるが、5GPaではトポロジカル絶縁体であることが明らかとなった。

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Books 【 display / non-display 】

  • Encyclopedia of High Pressure Science & Technology

    2022.11 ISBN: 978-4-254-10297-0

    Dictionary/Encyclopedia

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Review Papers 【 display / non-display 】

  • Pressure-induced phase-transition of YBa2Cu4O8

    A. Nakayama, Y. Onda, S. Yamada, H. Fujihisa, S. Nakano, A. Ohmura, F. Ishikawa, Y. Yamada,

    Photon Factory Activity Report 2013 ( 高エネルギー加速器研究機構　物質構造科学研究所　放射光科学研究施設 )  B   31-1 - 31-3   2014.03

    In-House Magazine  

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Presentations 【 display / non-display 】

  • Raman Spectroscopy of multi-layer graphene: hydrogen mixture under high pressure

    Oral Presentation(General)  Yuya Serizawa, Riku Takahashi, Ren Hattori, Satoshi Nakano, Atsuko Nakayama

    The 62nd High Pressure Conference of Japan 

    2021.10
    　
    　

    The Japan Society of High Pressure Science and Technology(JSHPST)

  • Phase transition in fluid hydrogen at room temperature

    Oral Presentation(General)  Atsuko NAKAYAMA, Yûya ISURUGI, Yuya SERIZAWA, Satoshi NAKANO, Ayako OHMURA Fumihiro ISHIKAWA

    The 62nd High Pressure Conference of Japan 

    2021.10
    　
    　

    The Japan Society of High Pressure Science and Technology(JSHPST)

  • Raman spectroscopy of hydrogen, phase I

    Oral Presentation(General)  Ren HATTORI, Atsuko NAKAYAMA , Satoshi NAKANO, Yuya SERIZAWA

    The 62nd High Pressure Conference of Japan 

    2021.10
    　
    　

    The Japan Society of High Pressure Science and Technology(JSHPST)

  • Confocal Raman Spectroscopy of Hydrogen-Graphite under high pressure

    Poster (General)  Yuya SERIZAWA, Satoshi NAKANO, Riku TAKAHASHI, Atsuko NAKAYAMA

    The 61st High Pressure Conference of Japan  (Online) 

    2020.12
    　
    　

    The Japan Society of High Pressure Science and Technology (JSHPST), The 61st High Pressure Conference of Japan Executive Committee

    DOI

  • Phonon anomalies of hydrogen compressed with multi-layer graphene

    Oral Presentation(General)  A. Nakayama, R. Takahashi, Y. Natsuya and S. Nakano

    2020.03
    　
    　

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Association Memberships 【 display / non-display 】

  • 2022.02
    　
    　
     

    Hydrogenomics Alliance, Japan

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