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Journal Articles

The $$f$$-electron state of the heavy fermion superconductor NpPd$$_5$$Al$$_2$$ and the isostructural family

Metoki, Naoto; Aczel, A. A.*; Aoki, Dai*; Chi, S.*; Fernandez-Baca, J. A.*; Griveau, J.-C.*; Hagihara, Masato*; Hong, T.*; Haga, Yoshinori; Ikeuchi, Kazuhiko*; et al.

JPS Conference Proceedings (Internet), 30, p.011123_1 - 011123_6, 2020/03

Rare earths (4$$f$$) and actinides (5$$f$$) provide variety of interesting states realized with competing interactions between the increasing number of $$f$$ electrons. Since crystal field splitting of many-body $$f$$ electron system is smaller than the bandwidth, (1) high resolution experiments are needed, (2) essentially no clear spectrum with well defined peaks is expected in itinerant Ce and U compounds, and (3) Np and Pu is strictly regulated. Therefore, systematic research on magnetic excitations by neutron scattering experiments of localized compounds and rare earth iso-structural reference is useful. We describe the $$f$$ electron states of heavy electron compounds NpPd$$_5$$Al$$_2$$ and actinide and rare earth based iso-structural family.

Journal Articles

Hard X-ray photoelectron spectroscopy study of Pt/Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$

Kobata, Masaaki; Yoshii, Kenji; Fukuda, Tatsuo; Kawasaki, Ikuto; Okane, Tetsuo; Yamagami, Hiroshi; Yaita, Tsuyoshi; Harii, Kazuya; Ieda, Junichi; Okayasu, Satoru; et al.

JPS Conference Proceedings (Internet), 30, p.011192_1 - 011192_6, 2020/03

High energy X-ray photoelectron spectroscopy (HAXPES) measurements were carried out for the Spin Seebeck system Pt/Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$(YIG). This system was found to show anomalous Hall effect, possible due to the formation of intermetallic compounds between Fe$$^{3+}$$ and Pt. To reveal this possibility, we have measured the Fe 1s photoelectron peaks by using HAXPES. It was found that the Fe ions consist of Fe$$^{3+}$$ in YIG and metallic Fe. The formation of the metallic state is consistent with the proposed origin of the anomalous Hall effect. Other spectra such as Pt 4f will be presented at the conference.

Journal Articles

Coexistence of superconductivity with quadrupole order in a $$Gamma_3$$ system

Kubo, Katsunori

JPS Conference Proceedings (Internet), 30, p.011041_1 - 011041_6, 2020/03

Journal Articles

Nature of structural instabilities in superconducting Sr$$_3$$Ir$$_4$$Sn$$_{13}$$

Kaneko, Koji; Cheung, Y. W.*; Hu, Y.*; Imai, Masaki*; Tanioku, Yasuaki*; Kanagawa, Hibiki*; Murakawa, Joichi*; Moriyama, Kodai*; Zhang, W.*; Lai, K. T.*; et al.

JPS Conference Proceedings (Internet), 30, p.011032_1 - 011032_6, 2020/03

Journal Articles

$$^{33}$$S nuclear magnetic resonance spectra of uranium disulfide $$beta$$-US$$_2$$

Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Ramakrishna, S. K.*; Reyes, A. P.*; Rosa, P. F. S.*; Ronning, F.*; Thompson, J. D.*; Fisk, Z.*; et al.

JPS Conference Proceedings (Internet), 30, p.011169_1 - 011169_6, 2020/03

Uranium disulfide $$beta$$-US$$_2$$ showing a semimetal-to-semiconductor crossover has been investigated by the nuclear magnetic resonance (NMR) technique for $$^{33}$$S nuclei with the nuclear spin of $$I=3/2$$. Since the natural concentration 0.76% of NMR active $$^{33}$$S nuclei is too dilute, the isotopic enrichment to $$sim$$50% has been carried out for the single crystal growth. The $$^{33}$$S NMR spectra have been successfully obtained using a single crystal of $$beta$$-US$$_2$$ with external fields along the crystallographic $$c$$ axis. The S sites assignments have been made based on these NMR spectra.

Journal Articles

Successive phase transitions in $$R_{3}$$Ir$$_{4}$$Sn$$_{13}$$ ($$R$$: La and Ce) investigated using neutron and X-ray diffraction

Nakazato, Seiya*; Iwasa, Kazuaki*; Hashimoto, Daisuke*; Shiozawa, Mami*; Kuwahara, Keitaro*; Nakao, Hironori*; Sagayama, Hajime*; Ishikado, Motoyuki*; Ohara, Takashi; Nakao, Akiko*; et al.

JPS Conference Proceedings (Internet), 30, p.011128_1 - 011128_6, 2020/03

Oral presentation

Magnetic and dielectric properties of Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$

Fukada, Yukimasa*; Yoshii, Kenji; Fujiwara, Kosuke*; Hayashi, Naoaki*; Fukuda, Tatsuo; Mizumaki, Masaichiro*; Shigematsu, Kei*; Azuma, Masaki*; Takeda, Masayasu; Ikeda, Naoshi*

no journal, , 

Magnetic and dielectric properties were investigated for poly and single crystalline Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$, a related oxide to the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R: rare earths). The magnetization measurements showed a ferrimagnetic transition at T$$_{N}$$=270 K. In addition, the temperature derivative showed the existence of a multiple magnetic transition. With cooling the sample, a broad transition occurs at 250-270 K, below which a sharp transition is observed. This result likely indicates the presence of multiple magnetic phases, rooted in the geometrical frustration on the triangular lattice. The dielectric measurements showed a possible correlation between magnetic and dielectric properties at about 120 K, at which both magnetization and AC susceptibility showed broad maxima. The other results will be presented at the conference.

Oral presentation

X-ray absorption study of perovskite Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$

Matsumura, Daiju; Yoshii, Kenji; Tsuji, Takuya

no journal, , 

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