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17 results on '"Izumi, Masanari"'

2. Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface

Author

Matsui, Fumihiko, Eguchi, Ritsuko, Nishiyama, Saki, Izumi, Masanari, Uesugi, Eri, Goto, Hidenori, Matsushita, Tomohiro, Sugita, Kenji, Daimon, Hiroshi, Hamamoto, Yuji, Hamada, Ikutaro, Morikawa, Yoshitada, Kubozono, Yoshihiro, Matsui, Fumihiko, Eguchi, Ritsuko, Nishiyama, Saki, Izumi, Masanari, Uesugi, Eri, Goto, Hidenori, Matsushita, Tomohiro, Sugita, Kenji, Daimon, Hiroshi, Hamamoto, Yuji, Hamada, Ikutaro, Morikawa, Yoshitada, and Kubozono, Yoshihiro

Abstract

From the C 1s and K 2p photoelectron holograms, we directly reconstructed atomic images of the cleaved surface of a bimetal-intercalated graphite superconductor, (Ca, K)C8, which differed substantially from the expected bulk crystal structure based on x-ray diffraction (XRD) measurements. Graphene atomic images were collected in the in-plane cross sections of the layers 3.3 Å and 5.7 Å above the photoelectron emitter C atom and the stacking structures were determined as AB- and AA-type, respectively. The intercalant metal atom layer was found between two AA-stacked graphenes. The K atomic image revealing 2 × 2 periodicity, occupying every second centre site of C hexagonal columns, was reconstructed, and the Ca 2p peak intensity in the photoelectron spectra of (Ca, K)C8 from the cleaved surface was less than a few hundredths of the K 2p peak intensity. These observations indicated that cleavage preferentially occurs at the KC8 layers containing no Ca atoms.

Published
2023

3. Superconductivity in aromatic hydrocarbons

Author

Kubozono, Yoshihiro, Goto, Hidenori, Jabuchi, Taihei, Yokoya, Takayoshi, Kambe, Takashi, Sakai, Yusuke, Izumi, Masanari, Zheng, Lu, Hamao, Shino, Nguyen, Huyen L.T., Sakata, Masafumi, Kagayama, Tomoko, and Shimizu, Katsuya

Published
2015
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4. Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface

Author

60324977, Matsui, Fumihiko, Eguchi, Ritsuko, Nishiyama, Saki, Izumi, Masanari, Uesugi, Eri, Goto, Hidenori, 10373523, Matsushita, Tomohiro, Sugita, Kenji, 20126121, Daimon, Hiroshi, Hamamoto, Yuji, Hamada, Ikutaro, Morikawa, Yoshitada, Kubozono, Yoshihiro, 60324977, Matsui, Fumihiko, Eguchi, Ritsuko, Nishiyama, Saki, Izumi, Masanari, Uesugi, Eri, Goto, Hidenori, 10373523, Matsushita, Tomohiro, Sugita, Kenji, 20126121, Daimon, Hiroshi, Hamamoto, Yuji, Hamada, Ikutaro, Morikawa, Yoshitada, and Kubozono, Yoshihiro

Abstract

application/pdf, From the C 1s and K 2p photoelectron holograms, we directly reconstructed atomic images of the cleaved surface of a bimetal-intercalated graphite superconductor, (Ca, K)C8, which differed substantially from the expected bulk crystal structure based on x-ray diffraction (XRD) measurements. Graphene atomic images were collected in the in-plane cross sections of the layers 3.3 Å and 5.7 Å above the photoelectron emitter C atom and the stacking structures were determined as AB- and AA-type, respectively. The intercalant metal atom layer was found between two AA-stacked graphenes. The K atomic image revealing 2 × 2 periodicity, occupying every second centre site of C hexagonal columns, was reconstructed, and the Ca 2p peak intensity in the photoelectron spectra of (Ca, K)C8 from the cleaved surface was less than a few hundredths of the K 2p peak intensity. These observations indicated that cleavage preferentially occurs at the KC8 layers containing no Ca atoms.

Published
2016

5. Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface

Author

Matsui, Fumihiko, 322, 60324977, Eguchi, Ritsuko, Nishiyama, Saki, 27439, Izumi, Masanari, 27440, Uesugi, Eri, 27441, Goto, Hidenori, 27442, Matsushita, Tomohiro, 194, 10373523, Sugita, Kenji, 27443, Daimon, Hiroshi, 29, 20126121, Hamamoto, Yuji, 27444, Hamada, Ikutaro, 27445, Morikawa, Yoshitada, 27446, Kubozono, Yoshihiro, 27447, Matsui, Fumihiko, 322, 60324977, Eguchi, Ritsuko, Nishiyama, Saki, 27439, Izumi, Masanari, 27440, Uesugi, Eri, 27441, Goto, Hidenori, 27442, Matsushita, Tomohiro, 194, 10373523, Sugita, Kenji, 27443, Daimon, Hiroshi, 29, 20126121, Hamamoto, Yuji, 27444, Hamada, Ikutaro, 27445, Morikawa, Yoshitada, 27446, Kubozono, Yoshihiro, and 27447

Abstract

From the C 1s and K 2p photoelectron holograms, we directly reconstructed atomic images of the cleaved surface of a bimetal-intercalated graphite superconductor, (Ca, K)C8, which differed substantially from the expected bulk crystal structure based on x-ray diffraction (XRD) measurements. Graphene atomic images were collected in the in-plane cross sections of the layers 3.3?A and 5.7?A above the photoelectron emitter C atom and the stacking structures were determined as AB- and AA-type, respectively. The intercalant metal atom layer was found between two AA-stacked graphenes. The K atomic image revealing 2?×?2 periodicity, occupying every second centre site of C hexagonal columns, was reconstructed, and the Ca 2p peak intensity in the photoelectron spectra of (Ca, K)C8 from the cleaved surface was less than a few hundredths of the K 2p peak intensity. These observations indicated that cleavage preferentially occurs at the KC8 layers containing no Ca atoms., journal article

Published
2016

6. Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface

Author

Matsui, Fumihiko, primary, Eguchi, Ritsuko, additional, Nishiyama, Saki, additional, Izumi, Masanari, additional, Uesugi, Eri, additional, Goto, Hidenori, additional, Matsushita, Tomohiro, additional, Sugita, Kenji, additional, Daimon, Hiroshi, additional, Hamamoto, Yuji, additional, Hamada, Ikutaro, additional, Morikawa, Yoshitada, additional, and Kubozono, Yoshihiro, additional

Published
2016
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7. Chemical analysis of superconducting phase in K-doped picene

Author

Kambe, Takashi, primary, Nishiyama, Saki, additional, Nguyen, Huyen L T, additional, Terao, Takahiro, additional, Izumi, Masanari, additional, Sakai, Yusuke, additional, Zheng, Lu, additional, Goto, Hidenori, additional, Itoh, Yugo, additional, Onji, Taiki, additional, Kobayashi, Tatsuo C, additional, Sugino, Hisako, additional, Gohda, Shin, additional, Okamoto, Hideki, additional, and Kubozono, Yoshihiro, additional

Published
2016
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8. Superconductivity in (NH3)(y)Cs0.4FeSe

Author

Zheng, Lu, Izumi, Masanari, Sakai, Yusuke, Eguchi, Ritsuko, Goto, Hidenori, Takabayashi, Yasuhiro, Kambe, Takashi, Onji, Taiki, Araki, Shingo, Kobayashi, Tatsuo C., Kim, Jungeun, Fujiwara, Akihiko, and Kubozono, Yoshihiro

Abstract

Alkali-metal-intercalated FeSe materials, (NH3)(y)M0.4FeSe (M: K, Rb, and Cs), have been synthesized using the liquid NH3 technique. (NH3)(y)Cs0.4FeSe shows a superconducting transition temperature (T-c) as high as 31.2 K, which is higher by 3.8 K than the T-c of nonammoniated Cs0.4FeSe. The T(c)s of (NH3)(y)K0.4FeSe and (NH3)(y)Rb0.4FeSe are almost the same as those of nonammoniated K0.4FeSe and Rb0.4FeSe. The T-c of (NH3)(y)Cs0.4FeSe shows a negative pressure dependence. A clear correlation between T-c and lattice constant c is found for ammoniated metal-intercalated FeSe materials, suggesting a correlation between Fermi-surface nesting and superconductivity.

Published
2012

10. Emergence of double-dome superconductivity in ammoniated metal-doped FeSe

Author

Izumi, Masanari, primary, Zheng, Lu, additional, Sakai, Yusuke, additional, Goto, Hidenori, additional, Sakata, Masafumi, additional, Nakamoto, Yuki, additional, Nguyen, Huyen L. T., additional, Kagayama, Tomoko, additional, Shimizu, Katsuya, additional, Araki, Shingo, additional, Kobayashi, Tatsuo C., additional, Kambe, Takashi, additional, Gu, Dachun, additional, Guo, Jing, additional, Liu, Jing, additional, Li, Yanchun, additional, Sun, Liling, additional, Prassides, Kosmas, additional, and Kubozono, Yoshihiro, additional

Published
2015
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14. Isotropic Three‐Dimensional Molecular Conductor Based on the Coronene Radical Cation

Author

Yoshida, Yukihiro, primary, Maesato, Mitsuhiko, additional, Kumagai, Yoshihide, additional, Mizuno, Motohiro, additional, Isomura, Kazuhide, additional, Kishida, Hideo, additional, Izumi, Masanari, additional, Kubozono, Yoshihiro, additional, Otsuka, Akihiro, additional, Yamochi, Hideki, additional, Saito, Gunzi, additional, Kirakci, Kaplan, additional, Cordier, Stéphane, additional, and Perrin, Christiane, additional

Published
2014
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15. Superconductivity in (NH3)yCs0.4FeSe

Author

Zheng, Lu, primary, Izumi, Masanari, additional, Sakai, Yusuke, additional, Eguchi, Ritsuko, additional, Goto, Hidenori, additional, Takabayashi, Yasuhiro, additional, Kambe, Takashi, additional, Onji, Taiki, additional, Araki, Shingo, additional, Kobayashi, Tatsuo C., additional, Kim, Jungeun, additional, Fujiwara, Akihiko, additional, and Kubozono, Yoshihiro, additional

Published
2013
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16. Observation of zero resistivity in K-doped picene

Author

Teranishi, Kazuya, primary, He, Xuexia, additional, Sakai, Yusuke, additional, Izumi, Masanari, additional, Goto, Hidenori, additional, Eguchi, Ritsuko, additional, Takabayashi, Yasuhiro, additional, Kambe, Takashi, additional, and Kubozono, Yoshihiro, additional

Published
2013
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17. Emergence of Multiple Superconducting Phases in (NH3)yMxFeSe (M: Na and Li).

Author

Zheng, Lu, Miao, Xiao, Sakai, Yusuke, Izumi, Masanari, Goto, Hidenori, Nishiyama, Saki, Uesugi, Eri, Kasahara, Yuichi, Iwasa, Yoshihiro, and Kubozono, Yoshihiro

Subjects
SUPERCONDUCTORS, SODIUM, DOPING agents (Chemistry), CRYSTAL structure, CRYSTAL lattices
Abstract

We previously discovered multiple superconducting phases in the ammoniated Na-doped FeSe material, (NH3)yNaxFeSe. To clarify the origin of the multiple superconducting phases, the variation of Tc was fully investigated as a function of x in (NH3)yNaxFeSe. The 32 K superconducting phase is mainly produced in the low-x region below 0.4, while only a single phase is observed at x = 1.1, with Tc = 45 K, showing that the Tc depends significantly on x, but it changes discontinuously with x. The crystal structure of (NH3)yNaxFeSe does not change as x increases up to 1.1, i.e., the space group of I4/mmm. The lattice constants, a and c, of the low-Tc phase (Tc = 32.5 K) are 3.9120(9) and 14.145(8) Å, respectively, while a = 3.8266(7) Å and c = 17.565(9) Å for the high-Tc phase (~46 K). The c increases in the high Tc phase, implying that the Tc is directly related to c. In (NH3)yLixFeSe material, the Tc varies continuously within the range of 39 to 44 K with changing x. Thus, the behavior of Tc is different from that of (NH3)yNaxFeSe. The difference may be due to the difference in the sites that the Na and Li occupy. [ABSTRACT FROM AUTHOR]

Published
2015
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