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Oral presentation

Ru-NQR under uni-axial stress in URu$$_{2}$$Si$$_{2}$$

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Harima, Hisatomo*

no journal, , 

Consider the hidden order of URu$$_{2}$$Si$$_{2}$$. Recent studies have limited the electronic state symmetry of hidden ordered states to some space groups. However, it is still difficult to distinguish because it has the same high symmetry. Therefore, it is necessary to see how the symmetry of the hidden ordered state is lowered by the external field such as uniaxial pressure. In this study, we discuss Ru-NQR when the uniaxial pressure is applied in the [100] direction to form an orthorhombic crystal.

Oral presentation

Fluorescence detected soft X-ray absorption spectroscopy for novel rare earth adsorbents

Kobayashi, Toru; Saito, Yuji; Yoshii, Kenji; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Magnetic fluctuations and superconductivity in UTe$$_2$$; NMR study

Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Opletal, P.; Tokiwa, Yoshifumi; Haga, Yoshinori

no journal, , 

no abstracts in English

Oral presentation

Magnetic properties of checkerboard lattice antiferromagnet KCuPO$$_4$$H$$_2$$O

Fujihara, Masayoshi; Morita, Katsuhiro*; Mitsuda, Setsuo*; Okabe, Hirotaka*; Koda, Akihiro*; Murai, Naoki; Hagihara, Masato

no journal, , 

no abstracts in English

Oral presentation

Observation of topological electronic structure of actinide compound ThSb via soft X-ray ARPES

Sumida, Kazuki; Fujimori, Shinichi; Kawasaki, Ikuto; Takeda, Yukiharu; Yamagami, Hiroshi; Kuroda, Kenta*; Haga, Yoshinori

no journal, , 

no abstracts in English

Oral presentation

Spin and energy transport mediated by magnon cluster

Onishi, Hiroaki

no journal, , 

no abstracts in English

Oral presentation

Scaling law of mass flow rate of a binary mixture near the critical point in a capillary tube under preferential adsorption

Yabunaka, Shunsuke; Fujitani, Yohei*

no journal, , 

no abstracts in English

Oral presentation

Crystal structure of CsHSO$$_{4}$$-Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$ composite

Fukaya, Nana*; Kodama, Katsuaki; Igawa, Naoki; Takahashi, Haruyuki*

no journal, , 

Crystal structure of CsHSO$$_{4}$$-Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$ composite was analyzed using the neutron diffraction and X-ray diffraction method. The matrix in the composite could be refined as the same crystal structure as Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$. In addition to Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$ and CsHSO$$_{4}$$ for composite, these include unattributable diffractions were also observed. In addition, the neutron diffraction data after heating at 180$$^{circ}$$C revealed that the diffractions attributed to CsHSO$$_{4}$$ disappeared and new diffractions were observed. Those suggested that the decomposition or loss of crystallinity of CsHSO$$_{4}$$ were caused by the heating.

Oral presentation

Field dependence of coupled sawtooth chain magnet Mn$$_{2}$$(OH)$$_{3}$$X (X = Cl, Br)

Hagihara, Masato; Torii, Shuki*

no journal, , 

no abstracts in English

Oral presentation

Structured excitation continuum and short-range correlations in a spin-1/2 triangular lattice antiferromagnet $$mathrm{Ba_3CoSb_2O_9}$$

Kojima, Yuki*; Nakajima, Kenji; Kurita, Nubuyuki*; Tanaka, Hidekazu*; Kawamura, Seiko; Murai, Naoki

no journal, , 

no abstracts in English

Oral presentation

Magnetic anisotropy of U$$_{7}$$Te$$_{12}$$

Opletal, P.; Sakai, Hironori; Haga, Yoshinori; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo

no journal, , 

Oral presentation

Electronic state of heavy-fermion superconductor UPt$$_3$$ studied by soft X-ray photoemission spectroscopy

Kawasaki, Ikuto; Fujimori, Shinichi; Takeda, Yukiharu; Sumida, Kazuki; Yamagami, Hiroshi; Yamamoto, Etsuji; Haga, Yoshinori; Takeuchi, Kazuharu

no journal, , 

no abstracts in English

Oral presentation

Quasiclassical theory of superconductivity with the sparse modeling approach

Nagai, Yuki; Shinaoka, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Magnetic entropy of UTe$$_2$$

Tokiwa, Yoshifumi; Opletal, P.; Sakai, Hironori; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo; Haga, Yoshinori; Kimata, Motoi*; Awaji, Satoshi*; Sasaki, Takahiko*; et al.

no journal, , 

UTe$$_2$$ has attracted much attention due to the possibility of reentrant superconductivity and spin triplet superconductivity in a magnetic field. In this material, when a magnetic field is applied in the b-axis direction, Tc decreases once due to the magnetic field, but Tc increases under a magnetic field of about 16T or more. In this field direction, there is a metamagnetic transition at 34T. The relationship between this metamagnetism and the anomalous enhancement of Tc has been discussed. Many unconventional superconductors exhibit an unusual metallic state in the normal phase. It is believed that magnetic fluctuations, which are the cause of this phenomenon, generate superconducting electron pairs. Entropy is a direct measure of fluctuations, as entropy exhibits a maximum at the quantum critical point. Therefore, the relationship between fluctuations and superconductivity can be clarified by entropy measurements in the normal state. In this study, we performed precise magnetization measurements at temperatures up to 2 K and magnetic fields up to 24 T using cryogen-free superconducting magnets at the Research Center for High Magnetic Field Superconducting Materials, IMR, Tohoku University. We used a thermodynamic relation to map the entropy in the magnetic field-temperature parameter space. In this talk, we discuss the relationship between the entropy increase due to metamagnetic fluctuations and superconductivity.

Oral presentation

Improvement of a method for growing single crystals of novel superconductor UTe$$_2$$

Sakai, Hironori; Opletal, P.; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Tokunaga, Yo; Kambe, Shinsaku; Haga, Yoshinori

no journal, , 

The superconducting transition temperature $$T_{rm c}$$ in the spin-triplet superconductor UTe$$_2$$ increases from the initial reported value of 1.6 K to 2.0 K as the newly reported one improving the growth condition. We have developed a growth method for the superconductor UTe$$_2$$ that is different from the usual chemical vapor phase transport method. As a result, we have succeeded in growing high-purity UTe$$_2$$ crystals at $$T_{rm c}$$=2.1 K and confirmed that the residual specific heat below $$T_{rm c}$$ is very low and the residual ratio of electrical resistance is very large. We report the optimization of the newly developed method for UTe$$_2$$.

Oral presentation

Superconducting upper critical fields in high-quality single crystals of UTe$$_2$$

Haga, Yoshinori; Sakai, Hironori; Opletal, P.; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo; Kimata, Motoi*; Nakamura, Shintaro*; Awaji, Satoshi*; et al.

no journal, , 

no abstracts in English

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