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Journal Articles

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

Sumi, Tatsuya*; Nagai, Kazuki*; Bao, J.*; Terasawa, Tomoo; Norimatsu, Wataru*; Kusunoki, Michiko*; Wakabayashi, Yusuke*

Applied Physics Letters, 117(14), p.143102_1 - 143102_5, 2020/10

https://doi.org/10.1063/5.0021071

Times Cited Count：4 Percentile：25.92(Physics, Applied)

A systematic structural study of epitaxial graphene samples on the SiC (0001) surface has been performed by the surface X-ray diffraction method, which is a non-contact technique. For samples with only a buffer layer, one layer graphene, and multilayer graphene, the distances between the buffer layer and the surface Si atoms were found to be 0.23 nm. This value is the same as reported values. For quasi-free-standing graphene samples prepared by the rapid cooling method, there was no buffer layer and the distance between the quasi-free-standing graphene and the surface Si atoms was 0.35 nm, which is significantly shorter than the value in hydrogen-intercalated graphene and slightly longer than the interplane distance in graphite. The Si occupancy deviated from unity within 1 nm of the SiC surface. The depth profile of the Si occupancy showed little sample dependence, and it was reproduced by a simple atomistic model based on random hopping of Si atoms.

Journal Articles

Structural investigation of magnetocapacitive SmMnO

Maeda, Hiroki*; Ishiguro, Yuki*; Honda, Takashi*; Jung, J.-S.*; Michimura, Shinji*; Inami, Toshiya; Kimura, Tsuyoshi*; Wakabayashi, Yusuke*

Journal of the Ceramic Society of Japan, 121(3), p.265 - 267, 2013/03

https://doi.org/10.2109/jcersj2.121.265

Times Cited Count：5 Percentile：30.35(Materials Science, Ceramics)

Structural deformation of a magnetocapacitive material SmMnO was studied by X-ray diffraction measurement in a magnetic field. This antiferromagnetic material shows a jump in dielectric constant at 9 K only when a magnetic field of a few tesla is applied. In-field X-ray diffraction measurements clarified that there is no sudden change in structure that involves atomic displacement within the c-plane in Pbnm notation, while the antiferromagnetic phase transition at 60 K gives rise to a noticeable rotation of the MnO octahedra. This rotation occurs to maximize the energy gain through the exchange interaction.

Journal Articles

Resonant X-ray scattering study on the filled skutterudite PrFeP $_{12}$

Ishii, Kenji; Inami, Toshiya; Murakami, Yoichi; Hao, L.*; Iwasa, Kazuaki*; Kogi, Masafumi*; Aoki, Yuji*; Sugawara, Hitoshi*; Sato, Hideyuki*; Imada, Shin*; et al.

Physica B; Condensed Matter, 329-333(1-4), p.467 - 468, 2003/05

https://doi.org/10.1016/S0921-4526(02)02037-9

Times Cited Count：6 Percentile：35.59(Physics, Condensed Matter)

Resonant x-ray scattering study was carried out to investigate an anomalous ordered state ( = 6.5 K) in the filled skutterudite PrFeP $_{12}$ . At the Pr- $L_{III}$ absorption edge, we observed resonant features in = odd reflections, which are forbidden in the structure above . Because these reflections contain the difference of anomalous scattering factor between two Pr atoms in the unit cell, and the ordered state is attributed to the ordering of two different electronic states of Pr.