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  1. Article ; Online: Tetramethyltetrathiafulvalene [(NbOF

    Nakamura, Toshikazu / Zhang, Lidong / Kitou, Shunsuke / Sawa, Hiroshi

    Inorganic chemistry

    2021  Volume 60, Issue 7, Page(s) 5206–5211

    Abstract: An unusual valence one-dimensional (1D) molecular charge transfer salt (TMTTF)( ... ...

    Abstract An unusual valence one-dimensional (1D) molecular charge transfer salt (TMTTF)(NbOF
    Language English
    Publishing date 2021-03-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/acs.inorgchem.1c00208
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  2. Book ; Online: Canted antiferromagnetism in a spin-orbit coupled $S_{\text{eff}} = 3/2$ triangular-lattice magnet DyAuGe

    Kurumaji, Takashi / Gen, Masaki / Kitou, Shunsuke / Sagayama, Hajime / Nakao, Hironori / Arima, Taka-hisa

    2024  

    Abstract: Exploration of nontrivial magnetic states induced by strong spin-orbit interaction is a central topic of frustrated magnetism. Extensive studies are concentrated on rare-earth-based magnets and 4d/5d transition metal compounds, which are mostly described ...

    Abstract Exploration of nontrivial magnetic states induced by strong spin-orbit interaction is a central topic of frustrated magnetism. Extensive studies are concentrated on rare-earth-based magnets and 4d/5d transition metal compounds, which are mostly described by an effective spin $S_{\text{eff}} = 1/2$ for the Kramers doublet of the lowest crystal-electric-field levels. Variety of magnetic orderings may be greatly enhanced when magnetic dipolar moments intertwined with multipolar degrees of freedom which are described by higher-rank tensors and often require the magnetic ions with $S_{\text{eff}} > 1/2$. Here, our synchrotron x-ray diffraction near the Dy $L_3$ edge has unveiled a canted antiferromagnetic ground state arising from a quasi-quartet ($S_{\text{eff}} = 3/2$) of 4f electrons in a triangular-lattice (TL) rare-earth intermetallics DyAuGe. Magnetic moment and electric-quadrupole moment are closely interlocked and noncollinear magnetic-dipole alignment is induced by antiferroic electric-quadrupole (AFQ) ordering in the TL layers. The correlation between the AFQ and canted magnetic structures is further confirmed by phase transitions in an in-plane magnetic field. These findings offer insights into the emergence of nontrivial magnetic states in frustrated TL systems described beyond the $S_{\text{eff}} = 1/2$.

    Comment: 12 pages, 5 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 530 ; 539
    Publishing date 2024-01-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Real-Space Observation of Ligand Hole State in Cubic Perovskite SrFeO

    Kitou, Shunsuke / Gen, Masaki / Nakamura, Yuiga / Sugimoto, Kunihisa / Tokunaga, Yusuke / Ishiwata, Shintaro / Arima, And Taka-Hisa

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2023  Volume 10, Issue 29, Page(s) e2302839

    Abstract: An anomalously high valence state sometimes shows up in transition-metal oxide compounds. In such systems, holes tend to occupy mainly the ligand p orbitals, giving rise to interesting physical properties such as superconductivity in cuprates and rich ... ...

    Abstract An anomalously high valence state sometimes shows up in transition-metal oxide compounds. In such systems, holes tend to occupy mainly the ligand p orbitals, giving rise to interesting physical properties such as superconductivity in cuprates and rich magnetic phases in ferrates. However, no one has ever observed the distribution of ligand holes in real space. Here, a successful observation of the spatial distribution of valence electrons in cubic perovskite SrFeO
    Language English
    Publishing date 2023-08-18
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202302839
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Molecular orbital formation and metastable short-range ordered structure in VO$_2$

    Kitou, Shunsuke / Nakano, Akitoshi / Imaizumi, Masato / Nakamura, Yuiga / Terasaki, Ichiro / Arima, Taka-hisa

    2023  

    Abstract: The metal-insulator transition (MIT) in vanadium dioxide VO$_2$ due to V-V dimerization has been extensively discussed for decades. While it is widely acknowledged that electron correlations, Peierls instabilities, and molecular orbital formations are ... ...

    Abstract The metal-insulator transition (MIT) in vanadium dioxide VO$_2$ due to V-V dimerization has been extensively discussed for decades. While it is widely acknowledged that electron correlations, Peierls instabilities, and molecular orbital formations are crucial for understanding the MIT of VO$_2$, the primary origin of the MIT remains controversial. In this study, we delve into the crystal structure and orbital state of VO$_2$ through synchrotron x-ray diffraction experiments. The molecular orbital formation corresponding to the V-V dimerization is directly observed in the low-temperature insulating monoclinic phase, called the M1 phase, as indicated by the valence electron density distribution. Moreover, diffuse scattering observed in the high-temperature metal phase of rutile structure suggests the presence of short-range correlation of V displacements, which is not directly attributed to the structural fluctuation of the M1 phase. The short-range order in the rutile phase will be the key to understanding the MIT in this system.

    Comment: 6 pages, 4 figures, Supplemental Material
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2023-10-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Orbital hybridization of donor and acceptor to enhance the conductivity of mixed-stack complexes.

    Fujino, Tomoko / Kameyama, Ryohei / Onozuka, Kota / Matsuo, Kazuki / Dekura, Shun / Miyamoto, Tatsuya / Guo, Zijing / Okamoto, Hiroshi / Nakamura, Toshikazu / Yoshimi, Kazuyoshi / Kitou, Shunsuke / Arima, Taka-Hisa / Sato, Hiroyasu / Yamamoto, Kaoru / Takahashi, Akira / Sawa, Hiroshi / Nakamura, Yuiga / Mori, Hatsumi

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 3028

    Abstract: Mixed-stack complexes which comprise columns of alternating donors and acceptors are organic conductors with typically poor electrical conductivity because they are either in a neutral or highly ionic state. This indicates that conductive carriers are ... ...

    Abstract Mixed-stack complexes which comprise columns of alternating donors and acceptors are organic conductors with typically poor electrical conductivity because they are either in a neutral or highly ionic state. This indicates that conductive carriers are insufficient or are mainly localized. In this study, mixed-stack complexes that uniquely exist at the neutral-ionic boundary were synthesized by combining donors (bis(3,4-ethylenedichalcogenothiophene)) and acceptors (fluorinated tetracyanoquinodimethanes) with similar energy levels and orbital symmetry between the highest occupied molecular orbital of the donor and the lowest unoccupied molecular orbital of the acceptor. Surprisingly, the orbitals were highly hybridized in the single-crystal complexes, enhancing the room-temperature conductivity (10
    Language English
    Publishing date 2024-04-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-47298-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book ; Online: Anisotropic magnetotransport properties coupled with spiral spin modulation in a triangular-lattice magnet EuZnGe

    Kurumaji, Takashi / Gen, Masaki / Kitou, Shunsuke / Sagayama, Hajime / Ikeda, Akihiko / Arima, Taka-hisa

    2022  

    Abstract: We investigate the thermodynamic, magnetic, and electrical transport properties of a triangular-lattice antiferromagnet EuZnGe using single crystals grown from Eu-Zn flux in sealed tantalum tubes. Magnetic properties are found to be isotropic in the ... ...

    Abstract We investigate the thermodynamic, magnetic, and electrical transport properties of a triangular-lattice antiferromagnet EuZnGe using single crystals grown from Eu-Zn flux in sealed tantalum tubes. Magnetic properties are found to be isotropic in the paramagnetic state while we observe an enhancement of in-plane magnetic susceptibility at the temperature near T* =11.3 K, suggesting an easy-plane anisotropy at low temperatures. Magnetic transition temperature is lower than T* as specific heat shows a peak at TN =7.6 K. We reveal the magnetic modulation along the c axis by resonant x-ray scattering at Eu L2 edge, which suggests competing magnetic interaction among Eu triangular-lattice layers. We observe a double-peak structure in the intensity profile along (0, 0, L) below TN, which is mainly composed of a dominant helical modulation with q ~ (0, 0, 0.4) coexisting with a secondary contribution from q ~ (0, 0, 0.5). We reproduce the intensity profile with a random mixture of five- and four-sublattice helices with spin rotation skipping due to hexagonal in-plane anisotropy. The metallic conductivity is highly anisotropic with the ratio rho_zz/rho_xx exceeding 10 over the entire temperature range and additionally exhibits a sharp enhancement of rho_zz at TN giving rise to rho_zz/rho_xx ~ 50, suggesting a coupling between out-of-plane electron conduction and the spiral magnetic modulations. In-plane magnetic field induces a spin-flop like transition, where the q = 0.4 peak disappears and an incommensurate peak of approximately qICM ~ 0.47 emerges, while the q = 0.5 modulation retains a finite intensity. This transition correlates with non-monotonic magnetoresistance and Hall resistivity, suggesting a significant interplay between electrons and spin structures through Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction.

    Comment: 9 pages, 6 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2022-08-03
    Publishing country us
    Document type Book ; Online
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  7. Article: Entropy-Assisted, Long-Period Stacking of Honeycomb Layers in an AlB₂-Type Silicide

    Spitz, Leonie / Nomoto, Takuya / Kitou, Shunsuke / Nakao, Hironori / Kikkawa, Akiko / Francoual, Sonia / Taguchi, Yasujiro / Arita, Ryotaro / Tokura, Yoshinori / Arima, Taka-hisa / Hirschberger, Max

    Journal of the American Chemical Society. 2022 Sept. 06, v. 144, no. 37

    2022  

    Abstract: Configurational entropy can impact crystallization processes, tipping the scales between structures of nearly equal internal energy. Using alloyed single crystals of Gd₂PdSi₃ in the AlB₂-type structure, we explore the formation of complex layer sequences ...

    Abstract Configurational entropy can impact crystallization processes, tipping the scales between structures of nearly equal internal energy. Using alloyed single crystals of Gd₂PdSi₃ in the AlB₂-type structure, we explore the formation of complex layer sequences made from alternating, two-dimensional triangular and honeycomb slabs. A four-period and an eight-period stacking sequence are found to be very close in internal energy, the latter being favored by entropy associated with covering the full configuration space of interlayer bonds. Possible consequences of polytype formation on magnetism in Gd₂PdSi₃ are discussed.
    Keywords crystallization ; energy ; entropy ; magnetism
    Language English
    Dates of publication 2022-0906
    Size p. 16866-16871.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.2c04995
    Database NAL-Catalogue (AGRICOLA)

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  8. Book ; Online: Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd-Tm, and Lu)

    Kurumaji, Takashi / Gen, Masaki / Kitou, Shunsuke / Ikeuchi, Kazuhiko / Nakamura, Mitsutaka / Ikeda, Akihiko / Arima, Taka-hisa

    2023  

    Abstract: We study structural and magnetic properties of rare-earth based semimetals RAuGe (R = Y, Gd-Tm, and Lu) using flux-grown single crystals. These compounds belong to the noncentrosymmetric polar space group P63mc. We confirm the systematic structural ... ...

    Abstract We study structural and magnetic properties of rare-earth based semimetals RAuGe (R = Y, Gd-Tm, and Lu) using flux-grown single crystals. These compounds belong to the noncentrosymmetric polar space group P63mc. We confirm the systematic structural evolution at room temperature as a function of ionic radius of rare earths to clarify the isopointal crossover between two polar structures: three-dimensional LiGaGe-type and quasi-two-dimensional NdPtSb-type. Magnetism shows a characteristic anisotropy in reasonable agreement with the crystal electric field (CEF) theory; the easy-plane-type anisotropy for R = Tb and Dy turns into the Ising-type anisotropy for R = Er and Tm. We evaluate the CEF parameters based on the Stevens operators to reasonably reproduce the temperature dependence of magnetic susceptibilities and specific heat for RAuGe (R = Tb-Tm). The estimated energy scale of the Ising gap (~ 11 meV) in TmAuGe is consistent with an excitation observed in an inelastic neutron scattering experiment. These findings suggest an opportunity for interplay between conduction electrons and nontrivial spin structures in the family of magnetic polar semimetals RAuGe.

    Comment: 10 pages, 7 figures, 1 table
    Keywords Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Subject code 530
    Publishing date 2023-01-07
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Entropy-Assisted, Long-Period Stacking of Honeycomb Layers in an AlB

    Spitz, Leonie / Nomoto, Takuya / Kitou, Shunsuke / Nakao, Hironori / Kikkawa, Akiko / Francoual, Sonia / Taguchi, Yasujiro / Arita, Ryotaro / Tokura, Yoshinori / Arima, Taka-Hisa / Hirschberger, Max

    Journal of the American Chemical Society

    2022  Volume 144, Issue 37, Page(s) 16866–16871

    Abstract: Configurational entropy can impact crystallization processes, tipping the scales between structures of nearly equal internal energy. Using alloyed single crystals of ... ...

    Abstract Configurational entropy can impact crystallization processes, tipping the scales between structures of nearly equal internal energy. Using alloyed single crystals of Gd
    Language English
    Publishing date 2022-09-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.2c04995
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: A molecular crystal with an unprecedentedly long-lived photoexcited state.

    Naito, Toshio / Watanabe, Naoki / Sakamoto, Yuuka / Miyaji, Yuuko / Shirahata, Takashi / Misaki, Yohji / Kitou, Shunsuke / Sawa, Hiroshi

    Dalton transactions (Cambridge, England : 2003)

    2019  Volume 48, Issue 34, Page(s) 12858–12866

    Abstract: The Au(iii)-complex anions in a newly synthesised compound BPY[Au(dmit) ...

    Abstract The Au(iii)-complex anions in a newly synthesised compound BPY[Au(dmit)
    Language English
    Publishing date 2019-07-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/c9dt02377a
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