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Journal Articles

Metallization and pressure-induced superconductivity in carrier doped excitonic insulator (Ta$$_{1-x}$$Ti$$_x$$)$$_2$$NiSe$$_5$$

Tsuchida, Shun*; Hirose, Yusuke; Sekikawa, Takuya; Ono, Yoshiaki*; Hirahara, Takuya*; Sano, Sumika*; Kawaguchi, Shogo*; Kobayashi, Shintaro*; Uwatoko, Yoshiya*; Settai, Rikio*

Journal of the Physical Society of Japan, 94(11), p.114703_1 - 114703_7, 2025/10

https://doi.org/10.7566/JPSJ.94.114703
 Times Cited Count：2 Percentile：51.84(Physics, Multidisciplinary)

We investigated the carrier doping effect on an excitonic insulator Ta$$_2$$NiSe$$_5$$ by means of the electrical resistivity $$rho$$ and Hall coefficient $$R_{rm H}$$ using single crystals of (Ta$$_{1-x}$$Ti$$_x$$)$$_2$$NiSe$$_5$$, and band calculation. The excitonic transition temperature $$T_{rm c}$$ is continuously suppressed to 83 K at $$x$$ = 0.104 while preserving the crystal structure. With increasing substitution concentration $$x$$, a semiconducting increment of $$rho$$ and $$R_{rm H}$$ is strongly suppressed and a metallic behavior is observed at $$x$$ > 0.06. Ti substitution can realize an excitonic correlated metallic state. This metallization is explained by the hole doping effect based on the band calculations. Applying pressure to the carrier doped (Ta$$_{1-x}$$Ti$$_x$$)$$_2$$NiSe$$_5$$, we found superconductivity above 2.6 GPa, which is much smaller than that of Ta$$_2$$NiSe$$_5$$ around 8 GPa. The carrier doping induced by Ti substitution favors superconductivity in this compound.

Journal Articles

Quasifree neutron knockout reaction reveals a small $$s$$-Orbital component in the Borromean nucleus $$^{17}$$B

Yang, Z. H.*; Kubota, Yuki*; Corsi, A.*; Yoshida, Kazuki; Sun, X.-X.*; Li, J. G.*; Kimura, Masaaki*; Michel, N.*; Ogata, Kazuyuki*; Yuan, C. X.*; et al.

Physical Review Letters, 126(8), p.082501_1 - 082501_8, 2021/02

AA2020-0819.pdf:1.29MB

https://doi.org/10.1103/PhysRevLett.126.082501
 Times Cited Count：97 Percentile：97.19(Physics, Multidisciplinary)

A quasifree ($$p$$,$$pn$$) experiment was performed to study the structure of the Borromean nucleus $$^{17}$$B, which had long been considered to have a neutron halo. By analyzing the momentum distributions and exclusive cross sections, we obtained the spectroscopic factors for $$1s_{1/2}$$ and $$0d_{5/2}$$ orbitals, and a surprisingly small percentage of 9(2)% was determined for $$1s_{1/2}$$. Our finding of such a small $$1s_{1/2}$$ component and the halo features reported in prior experiments can be explained by the deformed relativistic Hartree-Bogoliubov theory in continuum, revealing a definite but not dominant neutron halo in $$^{17}$$B. The present work gives the smallest $$s$$- or $$p$$-orbital component among known nuclei exhibiting halo features and implies that the dominant occupation of $$s$$ or $$p$$ orbitals is not a prerequisite for the occurrence of a neutron halo.

Journal Articles

Shell structure of the neutron-rich isotopes $$^{69,71,73}$$Co

Lokotko, T.*; Leblond, S.*; Lee, J.*; Doornenbal, P.*; Obertelli, A.*; Poves, A.*; Nowacki, F.*; Ogata, Kazuyuki*; Yoshida, Kazuki; Authelet, G.*; et al.

Physical Review C, 101(3), p.034314_1 - 034314_7, 2020/03

https://doi.org/10.1103/PhysRevC.101.034314
 Times Cited Count：19 Percentile：80.72(Physics, Nuclear)

The structures of the neutron-rich $$^{69,71,73}$$Co isotopes were investigated via ($$p,2p$$) knockout reactions at the Radioactive Isotope Beam Factory, RIKEN. Level schemes were reconstructed using the $$gamma-gamma$$ coincidence technique, with tentative spin-parity assignments based on the measured inclusive and exclusive cross sections. Comparison with shell-model calculations suggests coexistence of spherical and deformed shapes at low excitation energies in the $$^{69,71,73}$$Co isotopes.

Journal Articles

Shell evolution beyond $$Z$$=28 and $$N$$=50; Spectroscopy of $$^{81,82,83,84}$$Zn

Shand, C. M.*; Podoly$'a$k, Zs.*; G$'o$rska, M.*; Doornenbal, P.*; Obertelli, A.*; Nowacki, F.*; Otsuka, T.*; Sieja, K.*; Tostevin, J. A.*; Tsunoda, T.*; et al.

Physics Letters B, 773, p.492 - 497, 2017/10

https://doi.org/10.1016/j.physletb.2017.09.001
 Times Cited Count：36 Percentile：89.26(Astronomy & Astrophysics)

Oral presentation

Structural study of elemental substituted excitonic insulator Ta$$_{2}$$NiSe$$_{5}$$ using X-ray diffraction

Hirose, Yusuke; Tsuchida, Shun*; Sano, Sumika*; Kawaguchi, Shogo*; Kobayashi, Shintaro*; Omura, Ayako*; Settai, Rikio*

no journal, , 

Ta$$_{2}$$NiSe$$_{5}$$ undergoes a structural phase transition from orthorhombic to monoclinic at Tc~330K and simultaneously becomes an insulator, which attracts attention as one of candidate materials for exciton insulators, and has been actively studied. We have previously demonstrated that element substitution can suppress Tc and cause the system to become metallic. In this study, we aimed to clarify the origin of the change in electronic state due to element substitution by crystal structure analysis, and we performed powder X-ray diffraction experiments on element-substituted Ta$$_{2}$$NiSe$$_{5}$$ at BL02 of SPring-8, and we will report the results.

Oral presentation

None

Yamashita, Rio*; Tsuchida, Shun*; Sano, Sumika*; Hirose, Yusuke; Settai, Rikio*

no journal, , 

no abstracts in English

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