Zobrazeno 1 - 10
of 544
pro vyhledávání: '"Kumai, R."'
Autor:
Iida, K., Yoshida, H. K., Nakao, A., Jeschke, H. O., Iqbal, Y., Nakajima, K., Ohira-Kawamura, S., Munakata, K., Inamura, Y., Murai, N., Ishikado, M., Kumai, R., Okada, T., Oda, M., Kakurai, K., Matsuda, M.
Publikováno v:
Phys. Rev. B 101, 220408(R) (2020)
Crystal and magnetic structures of the mineral centennialite CaCu$_3$(OH)$_6$Cl$_2\cdot0.6$H$_2$O are investigated by means of synchrotron x-ray diffraction and neutron diffraction measurements complemented by density functional theory (DFT) and pseu
Externí odkaz:
http://arxiv.org/abs/2006.12651
Autor:
Fujihala, M., Sugimoto, T., Tohyama, T., Mitsuda, S., Mole, R. A., Yu, D. H., Yano, S., Inagaki, Y., Morodomi, H., Kawae, T., Sagayama, H., Kumai, R., Murakami, Y., Tomiyasu, K., Matsuo, A., Kindo, K.
Publikováno v:
Phys. Rev. Lett. 120, 077201 (2018)
Fedotovite K$_2$Cu$_3$O(SO$_4$)$_3$ is a candidate of new quantum spin systems, in which the edge-shared tetrahedral (EST) spin-clusters consisting of Cu$^{2+}$ are connected by weak inter-cluster couplings to from one-dimensional array. Comprehensiv
Externí odkaz:
http://arxiv.org/abs/1709.06405
Autor:
Miyasaka, S., Uekubo, M., Tsuji, H., Nakajima, M., Shiota, T., Mukuda, H., Tajima, S., Sagayama, H., Nakao, H., Kumai, R., Murakami, Y.
Publikováno v:
Physical Review B 95, 214515 (2017)
The phase diagram of LaFeAs$_{1-x}$P$_x$O system has been extensively studied through hole- and electron-doping as well as As/P-substitution. It has been revealed that there are three different superconducting phases with different Fermi surface (FS)
Externí odkaz:
http://arxiv.org/abs/1706.03954
Autor:
Fujihala, M., Koorikawa, H., Mitsuda, S., Morita, K., Tohyama, T., Tomiyasu, K., Koda, A., Okabe, H., Itoh, S., Yokoo, T., Ibuka, S., Tadokoro, M., Itoh, M., Sagayama, H., Kumai, R., Murakami, Y., Nakamura, D.
Publikováno v:
Scientific Reports 7 (2017) 16785
K$_3$Cu$_3$AlO$_2$(SO$_4$)$_4$ is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in the inelastic neutron scattering spectra, which is in excellent agree
Externí odkaz:
http://arxiv.org/abs/1705.01158
Autor:
Sasaki, S., Hashimoto, K., Kobayashi, R., Itoh, K., Iguchi, S., Nishio, Y., Ikemoto, Y., Moriwaki, T., Yoneyama, N., Watanabe, M., Ueda, A., Mori, H., Kobayashi, K., Kumai, R., Murakami, Y., Muller, J., Sasaki, T.
Publikováno v:
Science 357, 1381-1385 (2017)
Charge ordering (CO) is a phenomenon in which electrons in solids crystallize into a periodic pattern of charge-rich and charge-poor sites owing to strong electron correlations. This usually results in long-range order. In geometrically frustrated sy
Externí odkaz:
http://arxiv.org/abs/1612.01804
Autor:
Sato, T., Kagawa, F., Kobayashi, K., Ueda, A., Mori, H., Miyagawa, K., Kanoda, K., Kumai, R., Murakami, Y., Tokura, Y.
Publikováno v:
J. Phys. Soc. Jpn. 83, 083602 (2014)
The critical cooling rate $R_{\rm c}$ above which charge ordering is kinetically avoided upon cooling, which results in charge-glass formation, was investigated for the geometrically frustrated system $\theta$-(BEDT-TTF)$_2X$. X-ray diffraction exper
Externí odkaz:
http://arxiv.org/abs/1408.2913
Autor:
Kojima, K. M., Krockenberger, Y., Yamauchi, I., Miyazaki, M., Hiraishi, M., Koda, A., Kadono, R., Kumai, R., Yamamoto, H., Ikeda, A., Naito, M.
Publikováno v:
Physical Review B 89, 180508(R) (2014)
The Meissner effect has been directly demonstrated by depth-resolved muon spin rotation measurements in high-quality thin films of the T'-structured cuprate, T'-La$_{1.9}$Y$_{0.1}$CuO$_4$, to confirm bulk superconductivity ($T_c\simeq21$ K) in its {\
Externí odkaz:
http://arxiv.org/abs/1405.4594
Autor:
Sato, T., Kagawa, F., Kobayashi, K., Miyagawa, K., Kanoda, K., Kumai, R., Murakami, Y., Tokura, Y.
Publikováno v:
Phys. Rev. B 89, 121102(R) (2014)
Non-equilibrium charge dynamics, such as cooling-rate-dependent charge vitrification and physical aging, have been demonstrated for a charge-cluster glass in $\theta$-(BEDT-TTF)$_2$CsZn(SCN)$_4$ using electron transport measurements. The temperature
Externí odkaz:
http://arxiv.org/abs/1403.3392
Polarization Switching Ability Dependent on Multidomain Topology in a Uniaxial Organic Ferroelectric
Autor:
Kagawa, F., Horiuchi, S., Minami, N., Ishibashi, S., Kobayashi, K., Kumai, R., Murakami, Y., Tokura, Y.
Publikováno v:
Nano Letters 14, 239-243 (2014)
The switching of electric polarization induced by electric fields -a fundamental functionality of ferroelectrics- is closely associated with the motions of the domain walls that separate regions with distinct polarization directions. Therefore, under
Externí odkaz:
http://arxiv.org/abs/1401.2023
Autor:
Kagawa, F., Sato, T., Miyagawa, K., Kanoda, K., Tokura, Y., Kobayashi, K., Kumai, R., Murakami, Y.
Publikováno v:
Nature Phys. 9, 419 (2013)
Geometrically frustrated spin systems often do not exhibit long-range ordering, resulting in either quantum-mechanically disordered states, such as quantum spin liquids, or classically disordered states, such as spin ices or spin glasses. Geometric f
Externí odkaz:
http://arxiv.org/abs/1311.0344