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CoGa
filmsKubota, Takahide*; Takano, Daichi*; Kota, Yohei*; Mohanty, S.*; Ito, Keita*; Matsuki, Mitsuhiro*; Hayashida, Masahiro*; Sun, M.*; Takeda, Yukiharu; Saito, Yuji; et al.
Physical Review Materials (Internet), 6(4), p.044405_1 - 044405_12, 2022/04
-VSe
film revealed by element-specific X-ray magnetic circular dichroismSumida, Kazuki; Takeda, Yukiharu; Kusaka, Shotaro*; Kobayashi, Katsuyoshi*; Hirahara, Toru*
Physical Review Materials (Internet), 6(1), p.014006_1 - 014006_8, 2022/01
We investigated the intrinsic magnetic properties of the two-dimensional ferromagnetic candidate monolayer 1-VSe films using X-ray magnetic circular dichroism (XMCD), an element-specific magnetic probe. By performing high-resolution measurements, we succeeded in detecting a clear XMCD signal from the atomically thin 1-VSe films under an external magnetic field. Through manipulation of the X-ray incidence angle, we were able to disentangle the in-plane and out-of-plane magnetic properties and found a strong magnetic anisotropy. Moreover, magnetic field- and temperature-dependent XMCD revealed that there is no long-range ferromagnetic ordering even at 6 K, but short-range ferromagnetic and antiferromagnetic interactions between neighboring vanadium ions exist. Such low-temperature magnetic behavior signifies that the monolayer 1-VSe is on the verge of ferromagnetism, and this fact accounts for the reported ferromagnetism in VSe-based heterostructures.
Hayashida, Takeshi*; Uemura, Yohei*; Kimura, Kenta*; Matsuoka, Satoshi*; Hagihara, Masato; Hirose, Sakyo*; Morioka, Hitoshi*; Hasegawa, Tatsuo*; Kimura, Tsuyoshi*
Physical Review Materials (Internet), 5(12), p.124409_1 - 124409_10, 2021/12
Oba, Yojiro; Bersweiler, M.*; Titov, I.*; Adachi, Nozomu*; Todaka, Yoshikazu*; Gilbert, E. P.*; Steinke, N.-J.*; Metlov, K. L.*; Michels, A.*
Physical Review Materials (Internet), 5(8), p.084410_1 - 084410_9, 2021/08
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)
path integral simulationsKimizuka, Hajime*; Shiga, Motoyuki
Physical Review Materials (Internet), 5(6), p.065406_1 - 065406_9, 2021/06
Nuclear quantum effects are a non-negligible factor in the dynamic behavior of hydrogen in metals. In this study, we investigated the hydrogen diffusion in the face-centered cubic metals Al, Ag, and Cu using a first-principles integral molecular dynamics simulation that takes into account the nuclear quantum effects. It was found that the temperature dependence of hydrogen diffusion in Ag and Cu is inverted S-shaped, while the temperature dependence of hydrogen diffusion in Al is C-shaped. This difference is due to the fact that the most stable position of hydrogen is the octahedral site in Ag and Cu, while it is the tetrahedral site in Al. Therefore, it is found that the nuclear quantum effects of hydrogen diffusion (zero-point oscillation and tunneling) differ qualitatively depending on metals with different stable sites.
Matsumoto, Takahiro*; Nomata, Ikumi*; Ohara, Takashi; Kanemitsu, Yoshihiko*
Physical Review Materials (Internet), 5(6), p.066003_1 - 066003_9, 2021/06
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)Bersweiler, M.*; Sinaga, E. P.*; Peral, I.*; Adachi, Nozomu*; Bender, P.*; Steinke, N.-J.*; Gilbert, E. P.*; Todaka, Yoshikazu*; Michels, A.*; Oba, Yojiro
Physical Review Materials (Internet), 5(4), p.044409_1 - 044409_7, 2021/04
Times Cited Count：1 Percentile：69.4(Materials Science, Multidisciplinary)BSato, Yoshiki*; Honda, Fuminori*; Maurya, A.*; Shimizu, Yusei*; Nakamura, Ai*; Homma, Yoshiya*; Li, D.*; Haga, Yoshinori; Aoki, Dai*
Physical Review Materials (Internet), 5(3), p.034411_1 - 034411_9, 2021/03
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)
O
-Ti
O systemTakahama, Ryusei*; Ishii, Toi*; Indo, Daigo*; Arizono, Mitsutoshi*; Terakura, Chieko*; Tokura, Yoshinori*; Takeshita, Nao*; Noda, Masaaki*; Kuwahara, Hideki*; Saiki, Takuo*; et al.
Physical Review Materials (Internet), 4(7), p.074401_1 - 074401_11, 2020/07
Times Cited Count：1 Percentile：20.84(Materials Science, Multidisciplinary)
3)-ordered silicon layer on Al(111)Sato, Yusuke*; Fukaya, Yuki; Cameau, M.*; Kundu, A. K.*; Shiga, Daisuke*; Yukawa, Ryu*; Horiba, Koji*; Chen, C.-H.*; Huang, A.*; Jeng, H.-T.*; et al.
Physical Review Materials (Internet), 4(6), p.064005_1 - 064005_6, 2020/06
Times Cited Count：3 Percentile：51.8(Materials Science, Multidisciplinary)no abstracts in English
Guo, J.*; Zhao, X.*; Kawamura, Seiko; Ling, L.*; Wang, J.*; He, L.*; Nakajima, Kenji; Li, B.*; Zhang, Z.*
Physical Review Materials (Internet), 4(6), p.064410_1 - 064410_7, 2020/06
Times Cited Count：4 Percentile：51.8(Materials Science, Multidisciplinary) tuned by pressure and Ni substitutionGuguchia, Z.*; Frandsen, B. A.*; Santos-Cottin, D.*; Shamoto, Shinichi; Gauzzi, A.*; Uemura, Yasutomo*; 12 of others*
Physical Review Materials (Internet), 3(4), p.045001_1 - 045001_9, 2019/04
Times Cited Count：3 Percentile：28.74(Materials Science, Multidisciplinary)We have studied the Mott transition of BaCoS by pressure and Ni substitution using 
SR, and examined the appearance of the quantum phase transition. The results show that both quantum phase transitions are first-order transitions at zero temperature.
Co
)FeO
(x=0-1) layers on Si(111) studied by soft X-ray magnetic circular dichroismWakabayashi, Yuki*; Nonaka, Yosuke*; Takeda, Yukiharu; Sakamoto, Shoya*; Ikeda, Keisuke*; Chi, Z.*; Shibata, Goro*; Tanaka, Arata*; Saito, Yuji; Yamagami, Hiroshi; et al.
Physical Review Materials (Internet), 2(10), p.104416_1 - 104416_12, 2018/10
Times Cited Count：6 Percentile：37.83(Materials Science, Multidisciplinary) is not a prerequisite for the core/shell ion tracks or ion shapingAmekura, Hiroshi*; Kluth, P.*; Mota-Santiago, P.*; Sahlberg, I.*; Jantunen, V.*; Leino, A. A.*; Vazquez, H.*; Nordlund, K.*; Djurabekova, F.*; Okubo, Nariaki; et al.
Physical Review Materials (Internet), 2(9), p.096001_1 - 096001_10, 2018/09
Times Cited Count：6 Percentile：37.83(Materials Science, Multidisciplinary)When a swift heavy ion (SHI) penetrates amorphous SiO, a core/shell (C/S) ion track is formed due to vaporization, where the ion track consists of a lower-density core and a higher-density shell. Here we reexamine this hypothesis. The MD simulations indicate that the vaporization is not induced under 50-MeV Si irradiation (
= 3 keV/nm), but the C/S tracks and the ion shaping of nanoparticles are nevertheless induced. Thus, the vaporization is not a prerequisite for the C/S tracks and the ion shaping.
atoms in NiFe
N (
= 1 and 3) films revealed by X-ray absorption spectroscopy and magnetic circular dichroismTakata, Fumiya*; Ito, Keita*; Takeda, Yukiharu; Saito, Yuji; Takanashi, Koki*; Kimura, Akio*; Suemasu, Takashi*
Physical Review Materials (Internet), 2(2), p.024407_1 - 024407_5, 2018/02
Times Cited Count：10 Percentile：51.54(Materials Science, Multidisciplinary)Matsumoto, Takahiro*; Ohara, Takashi; Sugimoto, Hidehiko*; Bennington, S. M.*; Ikeda, Susumu*
Physical Review Materials (Internet), 1(5), p.051601_1 - 051601_6, 2017/10
Times Cited Count：2 Percentile：11.46(Materials Science, Multidisciplinary)Tsuru, Tomohito
Physical Review Materials (Internet), 1(3), p.033604_1 - 033604_5, 2017/08
Times Cited Count：2 Percentile：11.46(Materials Science, Multidisciplinary)A new mechanism of anomalous tension/compression (T/C) asymmetry in ultrafine-grained (UFG) metals is proposed using large-scale atomistic simulations and dislocation theory. Unlike coarse-grained metals, UFG Al exhibits remarkable T/C asymmetry of the yield stress. The atomistic simulations reveal that the yield event is not related to intragranular dislocations but caused by dislocation nucleation from the grain boundaries (GBs). The dislocation core structure associated with the stacking fault energy in Al is strongly affected by the external stress compared with Cu; specifically, high tensile stress stabilizes the dissociation into partial dislocations. These dislocations are more likely to be nucleated from GBs and form deformation twins from an energetic viewpoint. The new mechanism, which is completely different from well-known mechanisms for nanocrystalline and amorphous metals, is unique to high-strength UFG metals and can explain the difference in T/C asymmetry between UFG Cu and Al.
Winter, I. S.*; Tsuru, Tomohito; Chrzan, D. C.*
Physical Review Materials (Internet), 1(3), p.033606_1 - 033606_9, 2017/08
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)A first-principles investigation of the influence of lattice softening on lithium-magnesium alloys near the body-centered-cubic (bcc)/hexagonal close-packed (hcp) transition composition is presented. Results show that lithium-magnesium alloys display a softening of the shear modulus 
, and an acoustic phonon branch between the 
and 
high symmetry points, as the composition approaches the stability limit for the bcc phase. This softening is accompanied by an increase in the size of the dislocation core region. Ideal tensile strength calculations predict that ordered phases of lithium-magnesium alloys are intrinsically brittle. Methods to make the alloys more ductile are discussed, and the propensity for these alloys to display gum-metal-like behavior is assessed.
