Hiroshi Sawa
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View article: Reexamination of the charge-ordered dimer pattern in the spinel compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">CuIr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math> using single-crystal synchrotron x-ray diffraction
Reexamination of the charge-ordered dimer pattern in the spinel compound using single-crystal synchrotron x-ray diffraction Open
We have re-investigated the crystal structure of a spinel type CuIr2S4 at low temperatures using a single-crystal in a synchrotron radiation x-ray diffraction experiment. The crystal structure of the low-temperature phase of CuIr2S4 has be…
View article: Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal–Organic Framework
Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal–Organic Framework Open
Among the thirty-two crystallographic point groups, 432 is the only one that lacks an inversion center but does not exhibit piezoelectricity. A gyroidal structure belongs to point group 432 and shows characteristic physical properties attr…
View article: Melting of excitonic insulator phase by an intense terahertz pulse in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">T</mml:mi><mml:msub><mml:mi mathvariant="normal">a</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>NiS</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>
Melting of excitonic insulator phase by an intense terahertz pulse in Open
In this paper, the optical response to a terahertz pulse was investigated in the transition metal chalcogenide Ta2NiSe5, a candidate excitonic insulator. First, by irradiating a terahertz pulse with a relatively weak electric field (0.3 MV…
View article: Unveiling the Nature of Chemical Bonds in Real Space
Unveiling the Nature of Chemical Bonds in Real Space Open
Recent advent of diverse chemical entities necessitates a re-evaluation of chemical bond concepts, underscoring the importance of experimental evidence. Our prior study introduced a general methodology, termed Core Differential Fourier Syn…
View article: Orbital hybridization of donor and acceptor to enhance the conductivity of mixed-stack complexes
Orbital hybridization of donor and acceptor to enhance the conductivity of mixed-stack complexes Open
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 …
View article: Metastable ordered states induced by low-temperature annealing of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>δ</mml:mi><mml:mo>−</mml:mo><mml:msub><mml:mi mathvariant="normal">Ag</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>
Metastable ordered states induced by low-temperature annealing of Open
In $\ensuremath{\delta}\text{\ensuremath{-}}{\mathrm{Ag}}_{2/3}{\mathrm{V}}_{2}{\mathrm{O}}_{5}$ with charge degrees of freedom in V, it is known that the charge ordering state and physical properties of V that appear at low temperatures d…
View article: Metastable ordered states induced by low temperature annealing of δ-Ag2/3V2O5
Metastable ordered states induced by low temperature annealing of δ-Ag2/3V2O5 Open
In δ-Ag2/3V2O5 with charge degrees of freedom in V, it is known that the charge ordering state and physical properties of V that appear at low temperatures depend strongly on the ordering state of Ag. In this study, we focused on the Ag io…
View article: Zigzag chain order of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">LiVSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> developing away from the vanadium trimer phase transition boundary
Zigzag chain order of developing away from the vanadium trimer phase transition boundary Open
The phenomenon of self-assembly of constituent elements to form molecules at\nlow temperatures appears ubiquitously in transition metal compounds with\norbital degrees of freedom. Recent progress in local structure studies using\nsynchrotr…
View article: Melting of excitonic insulator phase by an intense terahertz pulse in Ta$_2$NiSe$_5$
Melting of excitonic insulator phase by an intense terahertz pulse in Ta$_2$NiSe$_5$ Open
In this study, the optical response to a terahertz pulse was investigated in the transition metal chalcogenide Ta$_2$NiSe$_5$, a candidate excitonic insulator. First, by irradiating a terahertz pulse with a relatively weak electric field (…
View article: Observation of local atomic displacements intrinsic to the double zigzag chain structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext>−</mml:mtext><mml:mi>M</mml:mi><mml:msub><mml:mi>Te</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi>Nb</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi>Ta</mml:mi></mml:math>)
Observation of local atomic displacements intrinsic to the double zigzag chain structure of () Open
We describe the existence of local distortion discovered in the synchrotron\nx-ray single-crystal structure analysis of layered ditelluride 1T-MTe2 (M = V,\nNb, Ta). In 1T-TaTe2, the double zigzag chain structure of Ta is deformed at\nabou…
View article: Quasi One-Dimensional Band Structure of Photoinduced Semimetal Phase of Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.0 and 0.1)
Quasi One-Dimensional Band Structure of Photoinduced Semimetal Phase of Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.0 and 0.1) Open
The photoinduced semimetal phase of Ta2Ni1−xCoxSe5 (x = 0.0 and 0.1) is studied by time-resolved angle-resolved photoemission spectroscopy. The observed band dispersions roughly agree with the generalized gradient approximation (GGA) calcu…
View article: CSD 1815857: Experimental Crystal Structure Determination
CSD 1815857: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Valence Electron Density Distribution Analysis by Synchrotron X-ray Single Crystal X-ray Diffraction
Valence Electron Density Distribution Analysis by Synchrotron X-ray Single Crystal X-ray Diffraction Open
The valence electron density distribution in crystals can be observed with high accuracy by precise electron density analysis using the core differential Fourier synthesis (CDFS) method with high-intensity and high-resolution single crysta…
View article: CSD 1957346: Experimental Crystal Structure Determination
CSD 1957346: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: CSD 1957345: Experimental Crystal Structure Determination
CSD 1957345: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: CSD 1957344: Experimental Crystal Structure Determination
CSD 1957344: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Charge and Lattice Dynamics in Excitonic Insulator Ta<sub>2</sub>NiSe<sub>5</sub> Investigated Using Ultrafast Reflection Spectroscopy
Charge and Lattice Dynamics in Excitonic Insulator Ta<sub>2</sub>NiSe<sub>5</sub> Investigated Using Ultrafast Reflection Spectroscopy Open
An excitonic insulator, in which an optical gap is formed by exciton condensation, is expected to exhibit large photoresponses. Here, we report the results of femtosecond reflection spectroscopy covering a wide infrared region on a typical…
View article: Charge-ordered state satisfying the Anderson condition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">LiRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math> arising from local dimer order
Charge-ordered state satisfying the Anderson condition in arising from local dimer order Open
We report on the charge-ordered structure of LiRh2O4 arising below the\nmetal-insulator transition at 170 K. Structural studies using synchrotron\nX-rays have revealed that the charge-ordered states of Rh3+ and Rh4+ with\ndimerization are …
View article: Do electron distributions with orbital degree of freedom exhibit anisotropy?
Do electron distributions with orbital degree of freedom exhibit anisotropy? Open
Direct observation of valence electron density reflecting orbital degrees of freedom on partially filled degenerate orbitals.
View article: CCDC 2049619: Experimental Crystal Structure Determination
CCDC 2049619: Experimental Crystal Structure Determination Open
View article: CCDC 2049620: Experimental Crystal Structure Determination
CCDC 2049620: Experimental Crystal Structure Determination Open
View article: Detecting electron-phonon coupling during photoinduced phase transition
Detecting electron-phonon coupling during photoinduced phase transition Open
Photo-induced phase transitions have been intensively studied owing to the\nability to control a material of interest in the ultrafast manner, which can\ninduce exotic phases unable to be attained at equilibrium. However, the key\nmechanis…
View article: CCDC 2008983: Experimental Crystal Structure Determination
CCDC 2008983: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2008980: Experimental Crystal Structure Determination
CCDC 2008980: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2008982: Experimental Crystal Structure Determination
CCDC 2008982: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2008981: Experimental Crystal Structure Determination
CCDC 2008981: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Ambient-pressure Dirac electron system in the quasi-two-dimensional molecular conductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BETS</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">I</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Ambient-pressure Dirac electron system in the quasi-two-dimensional molecular conductor Open
We investigated the precise crystal structures and electronic states in a\nquasi-two-dimensional molecular conductor ${\\alpha}$-(BETS)$_2$I$_3$ at ambient\npressure. The electronic resistivity of this molecular solid shows\nmetal-to-insul…
View article: Successive Structural Transitions of CrSe<sub>2</sub> with Anomalous Valent Chromium
Successive Structural Transitions of CrSe<sub>2</sub> with Anomalous Valent Chromium Open
View article: Photoinduced Phase Transition from Excitonic Insulator to Semimetal-like State in Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.10)
Photoinduced Phase Transition from Excitonic Insulator to Semimetal-like State in Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.10) Open
We report time-resolved angle-resolved photoemission study on Ta2Ni1−xCoxSe5 (x = 0.10) in which the excitonic insulator (EI) transition temperature is reduced by Co substitution for Ni. In the photoinduced phase, the conduction band is cl…
View article: CCDC 2036797: Experimental Crystal Structure Determination
CCDC 2036797: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …