Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1038/s41565-022-01159-4

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Other Link： https://www.nature.com/articles/s41565-022-01159-4

Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

DOI： 10.1103/PhysRevResearch.4.023232

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.4.023232/fulltext

Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

DOI： 10.1103/PhysRevResearch.3.L032071

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.3.L032071/fulltext

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Society of Japan  

We report the magnetic susceptibility and the magnetization under pressures up to 1.7 GPa above the critical pressure, P-c similar to 1.5 GPa, for H parallel to a, b, and c-axes in the novel spin triplet superconductor UTe2. The anisotropic magnetic susceptibility at low pressure with the easy magnetization a-axis changes to the quasi-isotropic behavior at high pressure, revealing a rapid suppression of the susceptibility for a-axis, and a gradual increase of the susceptibility for the b-axis. At 1.7 GPa above P-c, magnetic anomalies are detected at T-MO similar to 3K and T-WMO similar to 10 K. The former anomaly corresponds to long-range magnetic order, most likely antiferromagnetism, while the latter shows a broad anomaly, which is probably due to the development of short range order. The unusual decrease and increase of the susceptibility below T-WMO for H parallel to a and b-axes, respectively, indicate the complex magnetic properties at low temperatures above P-c. This is related to the interplay between multiple fluctuations dominated by antiferromagnetism, ferromagnetism, valence and Fermi surface instabilities.

DOI： 10.7566/jpsj.90.073703

Web of Science

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Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

DOI： 10.1103/PhysRevB.103.245114

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.103.245114/fulltext

Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society  

DOI： 10.1103/physrevb.103.094504

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.103.094504/fulltext

Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media {LLC}  

DOI： 10.1038/s41586-020-2590-4

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Publishing type：Research paper (international conference proceedings)   Publisher：Journal of the Physical Society of Japan  

DOI： 10.7566/jpscp.30.011043

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society  

DOI： 10.1103/physrevlett.123.217001

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.123.217001/fulltext

Language：Japanese   Publisher：The Physical Society of Japan  

DOI： 10.11316/jpsgaiyo.74.2.0_1867

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：APS  

DOI： 10.1103/physrevb.98.224510

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.98.224510/fulltext

Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：The Physical Society of Japan  

DOI： 10.7566/jpsj.87.014705

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Language：Japanese   Publisher：The Physical Society of Japan  

DOI： 10.11316/jpsgaiyo.73.1.0_2034

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Language：Japanese   Publisher：The Physical Society of Japan  

DOI： 10.11316/jpsgaiyo.73.2.0_1738

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Society of Japan  

DOI： 10.7566/jpsj.85.114709

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

DOI： 10.1088/1742-6596/592/1/012077

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Other Link： http://stacks.iop.org/1742-6596/592/i=1/a=012077?key=crossref.2245a071b21865554ab6a5612ddb1599

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Journal of the Physical Society of Japan  

DOI： 10.7566/jpscp.3.015020

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Society of Japan  

DOI： 10.7566/jpsj.83.043704

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Society of Japan  

We investigate a two-orbital model for iron-based superconductors to elucidate the effect of interplay between electron correlation and Jahn–Teller electron–phonon coupling by using the dynamical mean-field theory combined with the exact diagonalization method. When the intra- and inter-orbital Coulomb interactions, <italic>U</italic>and <italic>U</italic>′, increase with <italic>U</italic>= <italic>U</italic>′, both the local spin and orbital susceptibilities, χ_sand χ_o, increase with χ_s= χ_oin the absence of the Hund's rule coupling <italic>J</italic>and the electron–phonon coupling <italic>g</italic>. In the presence of <italic>J</italic>and <italic>g</italic>, there are distinct two regimes: for <inline-formula><tex-math version="MathJax"><![CDATA[\(J \gtrsim 2g^{2}/\omega _{0}\)]]></tex-math></inline-formula>with the phonon frequency ω₀, χ_sis enhanced relative to χ_oand shows a divergence at <italic>J</italic>= <italic>J</italic>_cabove which the system becomes Mott insulator, while for <inline-formula><tex-math version="MathJax"><![CDATA[\(J \lesssim 2g^{2}/\omega _{0}\)]]></tex-math></inline-formula>, χ_ois enhanced relative to χ_sand shows a divergence at <italic>g</italic>= <italic>g</italic>_cabove which the system becomes bipolaronic insulator. In the former regime, the superconductivity is mediated by antiferromagnetic fluctuations enhanced due to Fermi-surface nesting and is found to be largely dependent on carrier doping. On the other hand, in the latter regime, the superconductivity is mediated by ferro-orbital fluctuations and is observed for wide doping region including heavily doped case without the Fermi-surface nesting.

DOI： 10.7566/jpsj.83.044711

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Society of Japan  

We investigate the electronic state and the superconductivity in the five-orbital Hubbard model for iron pnictides by using the dynamical mean-field theory in conjunction with the Eliashberg equation. The renormalization factor exhibits significant orbital dependence resulting in the large change in the band dispersion as observed in recent ARPES experiments. The critical interactions towards the magnetic, orbital and superconducting instabilities are suppressed as compared with those from the random phase approximation (RPA) due to local correlation effects. Remarkably, the s_{++}-pairing phase due to the orbital fluctuation is largely expanded relative to the RPA result, while the s_{\pm}-pairing phase due to the magnetic fluctuation is reduced.

DOI： 10.7566/jpsj.82.123712

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