Browsing by Author "Uwatoko, Y"
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- ItemBlock magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe 2 Se 3(American Physical Society, 2012-02-22) Nambu, Y; Ohgushi, K; Suzuki, S; Du, F; Avdeev, M; Uwatoko, Y; Munakata, K; Fukazawa, H; Chi, S; Ueda, Y; Sato, TJMagnetism in the insulating BaFe2Se3 was examined through susceptibility, specific heat, resistivity, and neutron diffraction measurements. After formation of a short-range magnetic correlation, a long-range ordering was observed below TN∼255 K. The transition is obscured by bulk properties. Magnetic moments (∥a) are arranged to form a Fe4 ferromagnetic unit, and each Fe4 stacks antiferromagnetically. This block magnetism is of the third type among magnetic structures of ferrous materials. The magnetic ordering drives unusually large distortion via magnetoelastic coupling. ©2012 American Physical Society
- ItemMagnetic and transport properties of AFe_2Se_3 (A= Ba and Cs)(The Physical Society of Japan, 2012-03-05) Du, F; Ohgushi, K; Sasaki, R; Matsubayashi, K; Uwatoko, Y; Kawakami, T; Nambu, Y; Avdeev, M; Sato, TJ; Ueda, YThe orthorhombic AFe2Se3 (A=Ba and Cs) have attracted much attention due to the possibility of superconducivity AFe2Se3 The crystal structure of 14Fe2Se3 can be described as double chains of [Fe2Se3】formed by the edge sharing FeSe4 tetrahedra. We synthesize AFezSe3 single crystalline samples by the self flux method firstly, then studies the magnetic and transport properties under ambient and high pressure. BaFe2Se3 shows a semiconducting behavior. With increasing pressure 8 GPa, the charge gap of BaFe2Se3 gradually decreases; however, the ground state is still insulating at 8 GPa. Interestingly, CBFe2Se3 also shows a Semiconducting behavior although the formally mixed valence state of Fe ions. Mossbauer spectra of CsFe2Se3 indicate that electronic state of Fe ions is unique, ruling out the possibility of charge ordering. In addition, a magnetic transition at 170K is suggested from the hyperfine filed splitting in the Mossbauer spectra and neutron diffraction analysis.
- ItemPressure-induced superconductivity in the iron-based ladder material BaFe2S3(Springer Nature, 2015-07-20) Takahashi, H; Sugimoto, A; Nambu, Y; Yamauchi, T; Hirata, Y; Kawakami, T; Avdeev, M; Matsubayashi, K; Du, F; Kawashima, C; Soeda, H; Nakano, S; Uwatoko, Y; Ueda, Y; Sato, TJ; Ohgushi, KAll 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. © 2015, Nature Publishing Group
- ItemSuperconductivity on a crossover phenomenon of spin–ladder system SrCa13Cu24O41 single crystals(Physical Society of Japan (JPS), 2014-01-01) Hisada, A; Matsubayashi, K; Uwatoko, Y; Fujiwara, N; Deng, G; Pomjakushina, E; Conder, C; Radheep, DM; Thiyagarajan, R; Esakkimuthu, S; Arumugam, SElectrical resistivity and alternating current susceptibility measurements were performed for the spin–ladder compound SrCa13Cu24O41 under hydrostatic pressure up to 8 GPa. The superconducting transition was observed below TC = 14.7 K at pressures above 2 GPa. By using high-quality single crystals, the bulk superconductivity with a volume fraction of 50% and temperature quadratic behavior of the normal state resistivity were observed above 3.7 GPa. They suggest that a strong interladder interaction induces the bulk superconductivity and transforms the system into a Fermi-liquid-like state. The optimal pressure was in a crossover region and the highest TC was observed without going through the bulk superconducting state. Our results suggest that the superconducting state on the crossover phenomenon presents the feature of the doped two-leg spin–ladder system because the spin gap was observed in this compound. © 2014, The Physical Society of Japan.
- ItemTemperature and composition phase diagram in the iron-based ladder compounds Ba1−xCsxFe2Se3(American Physical Society, 2015-05-28) Hawai, T; Nambu, Y; Ohgushi, K; Du, F; Hirata, Y; Avdeev, M; Uwatoko, Y; Sekine, Y; Fukazawa, H; Ma, J; Chi, S; Ueda, Y; Yoshizawa, H; Sato, TJWe investigated the iron-based ladder compounds (Ba,Cs)Fe2Se3. Their parent compounds BaFe2Se3 and CsFe2Se3 have different space groups, formal valences of Fe, and magnetic structures. Electrical resistivity, specific heat, magnetic susceptibility, x-ray diffraction, and powder neutron diffraction measurements were conducted to obtain a temperature and composition phase diagram of this system. Block magnetism observed in BaFe2Se3 is drastically suppressed with Cs doping. In contrast, stripe magnetism observed in CsFe2Se3 is not so fragile against Ba doping. A new type of magnetic structure appears in intermediate compositions, which is similar to stripe magnetism of CsFe2Se3, but interladder spin configuration is different. Intermediate compounds show insulating behavior, nevertheless a finite T-linear contribution in specific heat was obtained at low temperatures. ©2015 American Physical Society