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Satoshi Nakano

Bio: Satoshi Nakano is an academic researcher from National Institute for Materials Science. The author has contributed to research in topics: Diamond anvil cell & Raman spectroscopy. The author has an hindex of 16, co-authored 74 publications receiving 1065 citations. Previous affiliations of Satoshi Nakano include National Institute of Advanced Industrial Science and Technology.


Papers
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TL;DR: In this article, pressure-induced superconductivity in the iron-based spin-ladder material BaFe2S3, a Mott insulator with striped-type magnetic ordering below ∼120 K, was found.
Abstract: All the iron-based superconductors identified so far share a square lattice composed of Fe atoms as a common feature, despite having different crystal structures. In copper-based materials, the superconducting phase emerges not only in square-lattice structures but also in ladder structures. Yet iron-based superconductors without a square-lattice motif have not been found, despite being actively sought out. Here, we report the discovery of pressure-induced superconductivity in the iron-based spin-ladder material BaFe2S3, a Mott insulator with striped-type magnetic ordering below ∼120 K. On the application of pressure this compound exhibits a metal-insulator transition at about 11 GPa, followed by the appearance of superconductivity below Tc = 14 K, right after the onset of the metallic phase. Our findings indicate that iron-based ladder compounds represent promising material platforms, in particular for studying the fundamentals of iron-based superconductivity.

142 citations

Journal ArticleDOI
TL;DR: The discovery of pressure-induced superconductivity in the iron-based spin-ladder material BaFe2S3, a Mott insulator with striped-type magnetic ordering below ∼120 K is reported, indicating thatIron-based ladder compounds represent promising material platforms, in particular for studying the fundamentals of Iron-based superconductors.
Abstract: All the iron-based superconductors identified to date share a square lattice composed of Fe atoms as a common feature, despite having different crystal structures. In copper-based materials, the superconducting phase emerges not only in square lattice structures but also in ladder structures. Yet iron-based superconductors without a square lattice motif have not been found despite being actively sought out. Here, we report the discovery of pressure-induced superconductivity in the iron-based spin-ladder material BaFe2S3, a Mott insulator with striped-type magnetic ordering below ~120 K. On the application of pressure this compound exhibits a metal-insulator transition at about 11 GPa, followed by the appearance of superconductivity below Tc = 14 K, right after the onset of the metallic phase. Our findings indicate that iron-based ladder compounds represent promising material platforms, in particular for studying the fundamentals of iron-based superconductivity.

107 citations

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TL;DR: In this paper, the authors investigated the compression properties of AlOOH and AlOOD under quasi-hydrostatic conditions at pressures up to 63.5 and 34.9 GPa, respectively.
Abstract: The compression behaviors of δ-AlOOH and δ-AlOOD were investigated under quasi-hydrostatic conditions at pressures up to 63.5 and 34.9 GPa, respectively, using results from synchrotron X-ray diffraction experiments conducted at ambient temperature. Because of the geometric isotope effect, at ambient pressure, the a and b axes of δ-AlOOD, which define the plane in which the hydrogen bond lies, are longer than those of δ-AOOH. Under increasing pressure, the a and b axes of δ-AlOOH stiffen at 10 GPa, although the c axis shows no marked change. Identical behavior was found in δ-AlOOD, but the change in compressibility was observed at a slightly higher pressure of 12 GPa. Axial ratios a / c and b / c first decrease rapidly with increasing pressure, then begin to increase at pressures >10 GPa in δ-AlOOH and >12 GPa in δ-AlOOD. At these pressures, the pressure dependence of a / b also changes from increasing to decreasing. The unit-cell volumes of δ-AlOOH and δ-AlOOD become slightly less compressible at high pressures. Assuming K ′ = 4, the calculated bulk moduli of δ-AlOOH below and above 10 GPa are 152(2) and 219(3) GPa, respectively. Those of δ-AlOOD below and above 12 GPa are 151(1) and 207(2) GPa, respectively.

85 citations

Journal ArticleDOI
TL;DR: In this article, a high-pressure body-centered cubic (bcc) phase was found in Bi-Te, which is denoted as phase IV, and this phase appears above 14.5 GPa.
Abstract: The pressure-induced phase transition of bismuth telluride, Bi${}_{2}$Te${}_{3}$, has been studied by synchrotron x-ray diffraction measurements at room temperature using a diamond-anvil cell (DAC) with loading pressures up to 29.8 GPa. We found a high-pressure body-centered cubic (bcc) phase in Bi${}_{2}$Te${}_{3}$ at 25.2 GPa, which is denoted as phase IV, and this phase appears above 14.5 GPa. Upon releasing the pressure from 29.8 GPa, the diffraction pattern changes with pressure hysteresis. The original rhombohedral phase is recovered at 2.43 GPa. The bcc structure can explain the phase IV peaks. We assumed that the structural model of phase IV is analogous to a substitutional binary alloy; the Bi and Te atoms are distributed in the bcc-lattice sites with space group $\mathrm{Im}\overline{3}m$. The results of a Rietveld analysis based on this model agree well with both the experimental data and calculated results. Therefore, the structure of phase IV in Bi${}_{2}$Te${}_{3}$ can be explained by a solid solution with a bcc lattice in the Bi-Te (60 atomic % tellurium) binary system.

69 citations

Journal ArticleDOI
TL;DR: In this article, the structural change in Bi2Te3 under high pressure up to 166 GPa has been studied by powder x-ray diffraction, and two times of phase transitions at room temperature at the pressures of 8 and 14 GPa, respectively, were observed.
Abstract: Structural change in Bi2Te3 under high pressure up to 166 GPa has been studied by powder x-ray diffraction We observed two times of phase transitions at room temperature at the pressures of 8 and 14 GPa, respectively According to our preliminary result on electrical resistance, it is reasonable to suppose that superconducting transition with T c =28 K at the pressures of 102 GPa is observed in phase II On the other hand, we found anomalies of the pressure dependences of lattice parameters and volume at around 2 GPa, which probably means the change in electrical structure on the Fermi surface †This paper was presented at the XLVIth European High Pressure Research Group (EHPRG 46) Meeting, Valencia (Spain), 7–12 September, 2008

64 citations


Cited by
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TL;DR: Experimental evidence is presented that the threshold pressure of ~120 GPa induces in molecular ammonia the process of autoionization to yet experimentally unknown ionic compound--ammonium amide, opening new possibilities for studying molecular interactions in hydrogen-bonded systems.
Abstract: Ionization of highly compressed ammonia has previously been predicted by computation. Here, the authors provide experimental evidence for this autoionization process at high pressures, showing the transformation of molecular ammonia into ammonium amide.

3,638 citations

01 Sep 1955
TL;DR: In this paper, the authors restrict their attention to the ferrites and a few other closely related materials, which are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present.
Abstract: In this chapter, we will restrict our attention to the ferrites and a few other closely related materials. The great interest in ferrites stems from their unique combination of a spontaneous magnetization and a high electrical resistivity. The observed magnetization results from the difference in the magnetizations of two non-equivalent sub-lattices of the magnetic ions in the crystal structure. Materials of this type should strictly be designated as “ferrimagnetic” and in some respects are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present. We shall not adhere to this special nomenclature except to emphasize effects, which are due to the existence of the sub-lattices.

2,659 citations

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TL;DR: A comprehensive review of all aspects of solid state batteries: their design, the materials used, and a detailed literature review of various important advances made in research is provided in this article.

562 citations

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TL;DR: In this paper, high-purity cubic boron nitride (cBN) and hexagonal Boron Nitride (hBN) single crystals were synthesized at 4.5 GPa and 1500 C using barium BORON nitride as a solvent, and their band edge optical properties were measured by cathodoluminescence spectroscopy.

512 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a review of the development of hydrogen storage materials, methods and techniques, including electrochemical and thermal storage systems, and an outlook for future prospects and research on hydrogen-based energy storage.

439 citations