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CaOsO
as a candidate material for magnetic octupole studied by hard X-ray magnetic circular dichroismShibata, Goro; Okamoto, Jun*; Hayashi, Hiroaki*; Kawamura, Naomi*; Tanaka, Arata*; Yamaura, Kazunari*; Streltsov, S.*; Huang, D. J.*; Fujimori, Atsushi*
no journal, ,
no abstracts in English
Kumada, Takayuki; Nakagawa, Hiroshi; Miura, Daisuke*; Sekine, Yurina; Motokawa, Ryuhei; Hiroi, Kosuke; Inamura, Yasuhiro; Oku, Takayuki; Oishi, Kazuki*; Morikawa, Toshiaki*; et al.
no journal, ,
The structure of nano-ice crystals in rapidly frozen sugar solution was elucidated by using spin-contrast-variation small-angle neutron scattering, which distinguishes the nano-ice crystal signal from the frozen amorphous solution signal by the polarization-dependent neutron scattering. The analysis revealed that the nano-ice crystals form a planar structure with a diameter exceeding tens of nanometers and a thickness of 1 nm, which is close to the critical nucleation size. This result suggests that the sugar molecules are preferentially bound to a specific face of nano-ice crystals, and then block the crystal growth perpendicular to that face.
Si under uniaxial stress, 2Kambe, Shinsaku; Haga, Yoshinori; Sakai, Hironori; Tokunaga, Yo; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Harima, Hisatomo*
no journal, ,
Consider the hidden order of URuSi. Recent studies have shown that the electronic state symmetry of hidden ordered states is restricted to a few space groups. However, since they have the same high symmetry, their distinction remains difficult. Therefore, it is necessary to see how external fields such as uniaxial pressure lower the symmetry of hidden ordered states. In this study, we discuss the Ru-NQR when the uniaxial pressure is applied to the [100] and [110] directions to form orthorhombic crystals.
O
Fukada, Yukimasa; Fukuda, Tatsuo; Yoshii, Kenji; Kimura, Akito*; Paku, G.*; Ikeda, Naoshi*
no journal, ,
no abstracts in English
Ishikawa, Norito; Taguchi, Tomitsugu*; Ogawa, Hiroaki
no journal, ,
Ion tracks are often found in ceramics that have been irradiated with swift heavy ions. According to our previous studies of transmission electron microscopy (TEM), the structure of ion tracks created near the surface and that of ion tracks in the bulk appears to be different. The origin of the difference is still unclear, although this difference is closely related to the mechanism of ion track formation. Therefore, it is important to clarify how different these structures are and why the difference arises. At first, we discuss how to difine the characteristics of the ion track structure based on our TEM results.
Mori, Michiyasu; Ziman, T.*
no journal, ,
no abstracts in English
Kubo, Katsunori
no journal, ,
no abstracts in English
Sekikawa, Takuya; Hwang, B.*; Ishizaka, Masato*; Matsuya, Yusuke*; Kawai, Hiroyuki*; Ono, Yoshiaki*; Sato, Tatsuhiko; Kai, Takeshi
no journal, ,
Deoxyribonucleic acid (DNA) carries the genetic information of living organisms through various combinations of guanine, cytosine, adenine, and thymine, and radiation biological effects are mainly caused by damage to DNA. In this study, in order to theoretically investigate the transient molecular conformational changes that occur before DNA damage takes hold, we analyzed the behavior of the sites responsible for the conformational changes and chemical reactions by targeting the DNA that produced the holes using the first-principles calculation software OpenMX. As a result, it was confirmed that the holes reproduce the event of trapping in the guanine molecule of DNA, which reproduces the experimental results, and it was also newly found that the DNA sugar chain shows intense molecular fluctuation. The results of this study are expected to contribute to the elucidation of the first-phase process of radiation biological effects.
NiSe
, 4Tsuchida, Shun*; Hirose, Yusuke*; Sekikawa, Takuya; Ono, Yoshiaki*; Settai, Rikio*
no journal, ,
Exciton insulators have the property that the entire crystal becomes an insulator due to the collective behavior of electrons and holes bound together in the crystal, and they are beginning to attract attention as a new physical property. In this study, we focused on TaNiSe, which is one of the excitonic insulator candidates, but its synthesis itself is difficult and its physical properties have not yet been clarified. Furthermore, when titanium is substituted for tantalum (M = Ti), the electrical resistivity of the sample with composition ratio x less than 0.06 is semiconducting, while the electrical resistivity of the high-temperature phase behaves metallic when x = 0.06 or higher. The phase transition shown in this study may be a new insight into the realization of excitonic insulators.
single crystal growth and superconducting phase diagramSakai, Hironori
no journal, ,
In this talk, I will briefly introduce the growth of high-purity single crystals of the novel superconductor UTe using the molten salt flux method. Additionally, we will present the superconducting phase diagram when applying a magnetic field along the crystal's 
-axis, corresponding to the magnetic hard axis, using a high-purity single crystal with a superconducting transition temperature 
= 2.1 K.
Ge
Haga, Yoshinori; Yamamoto, Etsuji; Nakamura, Ai*; Honda, Fuminori*; Aoki, Dai*; Matsumoto, Yuji*; Yamamura, Tomoo*; Shirasaki, Kenji*; Yamagami, Hiroshi*; Sumida, Kazuki
no journal, ,
no abstracts in English
U
RhZn
Kitazawa, Takafumi; Tokunaga, Yo; Haga, Yoshinori; Opletal, P.; Sakai, Hironori; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Ikeda, Yoichi*; Fujita, Masaki*
no journal, ,
no abstracts in English
Konishi, Ren*; Okutsu, Kenichi*; Kino, Yasushi*; Sasaki, Kyosuke*; Nakashima, Ryota*; Miyashita, Konan*; Yasuda, Kazuhiro*; Yamashita, Takuma*; Okada, Shinji*; Sato, Motoyasu*; et al.
no journal, ,
We are attempting to observe regenerative muons emitted from the surface of a solid hydrogen thin film by muon-catalyzed fusion by irradiating the film with muons that have the same charge as electrons and 207 times the mass of electrons. The main background factors in detecting regenerative muons are scattered muons from the accelerator, which are slowed down to the same level as regenerative muons by the target, and bremsstrahlung generated by the components of the device. The results show that there is little scattering within the solid hydrogen, and that the dominant slowing down process is at the Al foil upstream of the solid hydrogen target. The energy distribution of Bremsstrahlung at the X-ray detection position will be reported.
(LiFe
)N displaying single molecule magnet behaviorKofu, Maiko; Jesche, A.*; Breitner, F.*; H
hn, P.*; Kawamura, Seiko; Nakajima, Kenji; Hiroi, Kosuke; Oishi, Kazuki*; Kawamura, Yukihiko*
no journal, ,
no abstracts in English
Onishi, Hiroaki
no journal, ,
no abstracts in English
Ishitobi, Takayuki; Hattori, Kazumasa*
no journal, ,
no abstracts in English
Tokiwa, Yoshifumi; Opletal, P.; Sakai, Hironori; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo; Haga, Yoshinori; Kimata, Motoi*; Awaji, Satoshi*; Sasaki, Takahiko*; et al.
no journal, ,
In unconventional superconductors, there are cases of vortex liquid-like state. When the pinning is strong, vortices do not move, and thus, the formation of such abnormal states requires pure and pristine crystals. Recently, the growth of pure single crystals of the spin-triplet superconductor UTe using a molten salt flux has been reported. In this study, we report research on vortices in UTe using such pure single crystals. As a result, in the magnetic field range of 15 T to 22 T, the critical current showed a maximum in temperature dependence, and a low-temperature region with a low critical current was observed deep in the superconducting state. This low critical current region matches the recently reported intermediate field superconducting phase. This suggests a weakening of the pinning force and a decrease in the critical current in the intermediate field superconducting phase.
Tokiwa, Yoshifumi
no journal, ,
In unconventional superconductivity, magnetism is considered to be the origin of the superconducting interaction, and the relationship between magnetism and superconductivity is a central theme of research. UTe has attracted much attention due to its potential for reentrant superconductivity and spin-triplet superconductivity in magnetic fields. In this material, when a magnetic field is applied along the a-axis, a weak metamagnetism occurs near 6T due to Fermi surface instability. In the initial crystals synthesized by the vapor phase epitaxy, superconductivity disappeared in the magnetic field where metamagnetism was generated because 
= 1.6K and upper critical magnetic field 
= 6T, and superconductivity was not affected. In the pure single crystal synthesized by the molten salt flux method, =2.1K is 25% stronger than the initial Tc, while =12T is doubled. In this study, we revealed that this metamagnetism enhances .
Kaneda, Miyu*; Mori, Minami*; Takahashi, Masakuni*; Fukada, Yukimasa; Yoshii, Kenji; Ikeda, Naoshi*; Kano, Jun*; Fujii, Tatsuo*
no journal, ,
no abstracts in English
Ozawa, Akihiro*; Araki, Yasufumi; Nomura, Kentaro*
no journal, ,
no abstracts in English