Unusual Hall Effect Anomaly in MnSi Under Pressure (2008)
Lee, Minhyea, Kang, W., Onose, Y., Tokura, Y., Ong, N. P.
We report the observation of a highly unusual Hall current in the MnSi in an applied pressure P = 6-12 kbar. The Hall conductivity displays a distinctive step-wise field profile quite unlike any...
Charge dynamics in thermally and doping induced insulator-metal transitions of (Ti1-xVx)2O3 (2008)
Uchida, M., Fujioka, J., Onose, Y., Tokura, Y.
Charge dynamics of (Ti1-xVx)2O3 with x=0-0.06 has been investigated by measurements of charge transport and optical conductivity spectra in a wide temperature range of 2-600K with the focus on the...
Seki, S., Onose, Y., Tokura, Y.
Correlation between dielectric and magnetic properties was investigated on the triangular lattice antiferromagnets ACrO2 (A= Cu, Ag, Li, or Na) showing 120-degree spiral spin structure with easy-axis...
The Lorenz number in CeCoIn$_5$ inferred from the thermal and charge Hall currents (2007)
Onose, Y., Ong, N. P., Petrovic, C.
The thermal Hall conductivity $\kappa_{xy}$ and Hall conductivity $\sigma_{xy}$ in CeCoIn$_5$ are used to determine the Lorenz number ${\cal L}_H$ at low temperature $T$. This enables the separation...
Onose, Y., Li, Lu, Petrovic, C., Ong, N. P.
The heavy-electron superconductor CeCoIn$_5$ exhibits a puzzling precursor state above its superconducting critical temperature at $T_c$ = 2.3 K. The thermopower and Nernst signal are anomalous....
Resonance in Optimally Electron-Doped Superconductor Nd$_{1.85}$Ce$_{0.15}$CuO$_{4-\delta}$ (2007)
Zhao, Jun, Dai, Pengcheng, Li, Shiliang, Freeman, Paul G., Onose, Y., Tokura, Y.
We use inelastic neutron scattering to probe magnetic excitations of an optimally electron-doped superconductor Nd$_{1.85}$Ce$_{0.15}$CuO$_{4-\delta}$ above and below its superconducting transition...
Impurity-doping induced ferroelectricity in frustrated antiferromagnet CuFeO2 (2006)
Seki, S., Yamasaki, Y., Shiomi, Y., Iguchi, S., Onose, Y., Tokura, Y.
Dielectric responses have been investigated on the triangular-lattice antiferromagnet CuFeO2 and its site-diluted analogs CuFe1-xAlxO2 (x=0.01 and 0.02) with and without application of magnetic...
A hidden constant in the anomalous Hall effect of a high-purity magnet MnSi (2006)
Lee, Minhyea, Onose, Y., Tokura, Y., Ong, N. P.
Measurements of the Hall conductivity in MnSi can provide incisive tests of theories of the anomalous Hall (AH) effect, because both the mean-free-path and magnetoresistance (MR) are unusually large...
Thermal-Hall conductivity and long-lived quasiparticles in CeCoIn$_5$ (2006)
Onose, Y., Ong, N. P., Petrovic, C.
In CeCoIn$_5$, the thermal conductivity $\kappa_{xx}$ and Hall conductivity $\kappa_{xy}$ below $T_c$ display large anomalies below $T_c$. The strong suppression of the anomalies in weak fields...
Miyasato, T., Abe, N., Fujii, T., Asamitsu, A., Onoda, S., Onose, Y., ...
Anomalous Hall effect (AHE) and anomalous Nernst effect (ANE) in a variety of ferromagnetic metals including pure metals, oxides, and chalcogenides, are studied to obtain unified understandings of...
Superconductivity in Cu_xTiSe_2 (2006)
Morosan, E., Zandbergen, H. W., Dennis, B. S., Bos, J. W. G., Onose, Y., Klimczuk, T., ...
Charge density waves (CDWs) are periodic modulations of the conduction electron density in solids. They are collective states that arise from intrinsic instabilities often present in low dimensional...
Impurity-induced transition to a Mott insulator in Sr$_3$Ru$_2$O$_7$ (2005)
Mathieu, R., Asamitsu, A., Kaneko, Y., He, J. P., Yu, X. Z., Kumai, R., ...
The electrical, magnetic, and structural properties of Sr$_3$(Ru$_{1-x}$Mn$_x$)$_2$O$_7$ (0 $\leq x \leq$ 0.2) are investigated. The parent compound Sr$_3$Ru$_2$O$_7$ is a paramagnetic metal,...
Spin-Charge Coupling in lightly doped Nd$_{2-x}$Ce$_{x}$CuO$_4$ (2004)
Li, Shiliang, Wilson, Stephen D., Mandrus, David, Zhao, Bairu, Onose, Y., Tokura, Y., ...
We use neutron scattering to study the influence of a magnetic field on spin structures of Nd$_2$CuO$_4$. On cooling from room temperature, Nd$_2$CuO$_4$ goes through a series of antiferromagnetic...
Specific heat study of spin-structural change in pyrochlore Nd$_2$Mo$_2$O$_7$ (2004)
Onose, Y., Taguchi, Y., Ito, T., Tokura, Y.
By measurements of specific heat, we have investigated the magnetic field ($H$) induced spin-structural change in Nd$_2$Mo$_2$O$_7$ that shows spin-chirality-related magneto-transport phenomena. A...
Fully Gapped Single-Particle Excitations in the Lightly Doped Cuprates (2003)
Shen, K. M., Yoshida, T., Lu, D. H., Ronning, F., Armitage, N. P., Lee, W. S., ...
The low-energy excitations of the lightly doped cuprates were studied by angle-resolved photoemission spectroscopy. A finite gap was measured over the entire Brillouin zone, including along the...
Reply to the comment cond-mat/0308067 (2003)
Kang, H. J., Dai, Pengcheng, Lynn, J. W., Matsuura, M., Thompson, J. R., Zhang, Shou-Cheng, ...
Mang et al. report the observation of a cubic (Nd,Ce)2O3 impurity phase grown epitaxially in annealed samples of electron-doped Nd2-xCexCuO4 (NCCO) and argue that our observed magnetic scattering in...
Matsuura, M., Dai, Pengcheng, Kang, H. J., Lynn, J. W., Argyriou, D. N., Prokes, K., ...
We have measured the effect of a c-axis aligned magnetic field on the long-range magnetic order of insulating Nd2CuO4, as-grown nonsuperconducting and superconducting Nd1.85Ce0.15CuO4. On cooling...
Armitage, N. P., Lu, D. H., Kim, C., Damascelli, A., Shen, K. M., Ronning, F., ...
Using methods made possible by recent advances in photoemission technology, we perform an indepth line-shape analysis of the angle-resolved photoemission spectra of the electron doped (n-type)...
Doping dependence of an n-type cuprate superconductor investigated by ARPES (2002)
Armitage, N. P., Ronning, F., Lu, D. H., Kim, C., Damascelli, A., Shen, K. M., ...
We present an angle resolved photoemission (ARPES) doping dependence study of the n-type cuprate superconductor Nd_2-xCe_xCuO_4, from the half-filled Mott-insulator to the T_c=24K superconductor. In...
Anomalous electronic structure and pseudogap effects in Nd_1.85Ce_0.15CuO_4 (2001)
Armitage, N. P., Lu, D. H., Kim, C., Damascelli, A., Shen, K. M., Ronning, F., ...
We report a high-resolution angle-resolved photoemission spectroscopic (ARPES) study of the electron-doped (n-type) cuprate superconductor Nd_1.85Ce_0.15CuO_4. We observe regions along the Fermi...
Harima, N., Matsuno, J., Fujimori, A., Onose, Y., Taguchi, Y., Tokura, Y.
We have studied the chemical potential shift in the electron-doped superconductor Nd$_{2-x}$Ce$_{x}$CuO$_{4}$ by precise measurements of core-level photoemission spectra. The result shows that the...
Superconducting Gap Anisotropy in Nd$_{1.85}$Ce$_{0.15}$CuO$_4$: Results from Photoemission (2000)
Armitage, N. P., Lu, D. H., Feng, D. L., Kim, C., Damascelli, A., Shen, K. M., ...
We have performed angle resolved photoelectron spectroscopy on the electron doped cuprate superconductor Nd$_{1.85}$Ce$_{0.15}$CuO$_4$. A comparison of the leading edge midpoints between the...