Toward constraints on galaxy formation scenarios: stellar properties from Galactic surveys (2008)
Fiorentin, P. Re, Beers, T. C., Zwitter, T., Lee, Y. S.
We present some of the strategies being developed to classify and parameterize objects obtained with spectra from the Sloan Digital Sky Survey (SDSS) and the RAdial Velocity Experiment (RAVE) and...
Moon, S. J., Jin, H., Kim, K. W., Choi, W. S., Lee, Y. S., Yu, J., ...
We investigated the electronic structures of the 5$d$ Ruddlesden-Popper series Sr$_{n+1}$Ir$_{n}$O$_{3n+1}$ ($n$=1, 2, and $\infty$) using optical spectroscopy and first-principles calculations. As...
Spin Correlations in the Geometrically Frustrated Pyrochlore Tb2Mo2O7 (2008)
Singh, D. K., Helton, J. S., Chu, S., Han, T. H., Bonnoit, C. J., Chang, S., ...
We report neutron scattering studies of the spin correlations of the geometrically frustrated pyrochlore Tb2Mo2O7 using single crystal samples. This material undergoes a spin-freezing transition...
Zhao, G., Fiorentin, P. Re, Naab, T., Steinmetz, M., ...
We derive new constraints on the mass of the Milky Way's dark matter halo, based on a set of halo stars from SDSS as kinematic tracers. Our sample comprises 2401 rigorously selected Blue...
The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters (2007)
Lee, Y. S., Beers, T. C., Sivarani, T., Johnson, J. A., An, D., Wilhelm, R., ...
We validate the performance and accuracy of the current SEGUE (Sloan Extension for Galactic Understanding and Exploration) Stellar Parameter Pipeline (SSPP), which determines stellar atmospheric...
Prieto, C. Allende, Sivarani, T., Beers, T. C., Lee, Y. S., Koesterke, L., Shetrone, M., ...
We report high-resolution spectroscopy of 125 field stars previously observed as part of the Sloan Digital Sky Survey and its program for Galactic studies, the Sloan Extension for Galactic...
Electronic structures of hexagonal RMnO3 (R = Gd, Tb, Dy, and Ho) thin films (2007)
Choi, W. S., Kim, D. G., Seo, S. S. A., Moon, S. J., Lee, D., Lee, J. H., ...
We investigated the electronic structure of multiferroic hexagonal RMnO3 (R = Gd, Tb, Dy, and Ho) thin films using both optical spectroscopy and first-principles calculations. Using artificially...
X-ray Scattering Study of the spin-Peierls transition and soft phonon behavior in TiOCl (2007)
Abel, E. T., Matan, K., Chou, F. C., Isaacs, E. D., Moncton, D. E., Sinn, H., ...
We have studied the S=1/2 quasi-one-dimensional antiferromagnet TiOCl using single crystal x-ray diffraction and inelastic x-ray scattering techniques. The Ti ions form staggered spin chains which...
Searching for Stable Na-ordered Phases in Single Crystal Samples of gamma-NaxCoO2 (2007)
Shu, G. J., Prodi, Andrea, Chu, S. Y., Lee, Y. S., Sheu, H. S., Chou, F. C.
We report on the preparation and characterization of single crystal gamma phase NaxCoO2 with 0.25 < x < 0.84 using a non-aqueous electrochemical chronoamperemetry technique. By carefully mapping the...
Fluorine in a Carbon-Enhanced Metal-Poor Star (2007)
Schuler, S. C., Cunha, K., Smith, V. V., Sivarani, T., Beers, T. C., Lee, Y. S.
The fluorine abundance of the Carbon-Enhanced Metal-Poor (CEMP) star HE 1305+0132 has been derived by analysis of the molecular HF (1-0) R9 line at 2.3357 microns in a high-resolution (R = 50,000)...
Moon, S. J., Choi, W. S., Kim, S. J., Lee, Y. S., Khalifah, P. G., Mandrus, D., ...
We investigated the electronic response of the quasi-two-dimensional spin gap compound La4Ru2O10 using optical spectroscopy. We observed drastic changes in the optical spectra as the temperature...
Two Stellar Components in the Halo of the Milky Way (2007)
Carollo, D., Beers, T. C., Lee, Y. S., Chiba, M., Norris, J. E., Wilhelm, R., ...
The halo of the Milky Way provides unique elemental abundance and kinematic information on the first objects to form in the Universe, which can be used to tightly constrain models of galaxy formation...
Excitation functions of proton induced nuclear reactions on natW up to 40 MeV (2007)
Khandake, M. U., Uddin, M. S., Kim, K. S., Lee, M. W., Lee, Y. S., Kim, G. N.
Excitation functions for the production of the 181,182m,182g,183,184g,186Re and 183,184Ta radionuclides from proton bombardment on natural tungsten were measured using the stacked-foil activation...
Estimation of stellar atmospheric parameters from SDSS/SEGUE spectra (2007)
Fiorentin, P. Re, Lee, Y. S., Beers, T. C., Sivarani, T., Wilhelm, R., ...
We present techniques for the estimation of stellar atmospheric parameters (Teff,logg,[Fe/H]) for stars from the SDSS/SEGUE survey. The atmospheric parameters are derived from the observed...
Evidence for an incommensurate magnetic resonance in La2-xSrxCuO4 (2007)
Tranquada, J. M., Lee, C. H., Yamada, K., Lee, Y. S., Regnault, L. P., Ronnow, H. M.
We study the effect of a magnetic field (applied along the c axis) on the low-energy, incommensurate magnetic fluctuations in superconducting La1.82Sr0.18CuO4. The incommensurate peaks at 9 meV,...
Mathieu, R., He, J. P., Yu, X. Z., Kaneko, Y., Uchida, M., Lee, Y. S., ...
The relationship between orbital and spin degrees of freedom in the single-crystals of the hole-doped Pr$_{1-x}$Ca$_{1+x}$MnO$_4$, 0.3 $\leq$ $x$ $\leq$ 0.7, has been investigated by means of...
Estimation of stellar atmospheric parameters from SDSS/SEGUE spectra (2007)
Re Fiorentin, P., Lee, Y. S., Beers, T. C., Sivarani, T., Wilhelm, R., ...
We present techniques for the estimation of stellar atmospheric parameters (T_eff, log~g, [Fe/H]) for stars from the SDSS/SEGUE survey. The atmospheric parameters are derived from the observed...
Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2 (2006)
Helton, J. S., Matan, K., Shores, M. P., Nytko, E. A., Bartlett, B. M., Yoshida, Y., ...
We have performed thermodynamic and neutron scattering measurements on the S=1/2 kagome lattice antiferromagnet Zn Cu_3 (OH)_6 Cl_2. The susceptibility indicates a Curie-Weiss temperature of ~ -300...
Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and Ir) (2006)
Moon, S. J., Kim, M. W., Kim, K. W., Lee, Y. S., ...
We investigated the electronic structures of the two-dimensional layered perovskite Sr$_{2}$\textit{M}O$_{4}$ (\textit{M}=4\textit{d} Ru, 4\textit{d} Rh, and 5\textit{d} Ir) using optical...
Lee, Y. S., Onoda, S., Arima, T., Tokunaga, Y., He, J. P., Kaneko, Y., ...
We report on the in-plane anisotropy of the electronic response in the spin/charge/orbital ordered phase of a half-doped layered-structure manganite. The optical conductivity spectra for a single...
Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2 (2006)
Matan, K., Grohol, D., Nocera, D. G., Yildirim, T., Harris, A. B., Lee, S. H., ...
The spin wave excitations of the ideal S=5/2 Kagome lattice antiferromagnet KFe3(OH)6(SO4)2 have been measured using high-resolution inelastic neutron scattering. We directly observe a flat mode...
The Galactic Nature of High Velocity Cloud Complex WB (2006)
Thom, C., Putman, M. E., Gibson, B. K., Christlieb, N., Flynn, C., Beers, T. C., ...
We have detected absorption lines from the High Velocity Cloud Complex WB in the spectrum of the star HE1048+0231. This detection sets an upper distance limit to the cloud of 8.8^{+2.3}_{-1.3} kpc....
Strong-coupling Effects in cuprate High-$T_{c}$ Superconductors by magnetooptical studies (2005)
Lee, Y. S., Li, Z. Q., Padilla, W. J., Dordevic, S. V., Homes, C. C., Segawa, Kouji, ...
Signatures of strong coupling effects in cuprate high-$T_{c}$ superconductors have been authenticated through a variety of spectroscopic probes. However, the microscopic nature of relevant...
Prieto, C. Allende, Beers, T. C., Wilhelm, R., Newberg, H. J., Rockosi, C. M., Yanny, B., ...
(Abridged) We perform an analysis of spectra and photometry for 22,770 stars included in the third data release (DR3) of the SDSS. We measure radial velocities and, based on a model-atmosphere...
Constant effective mass across the phase diagram of high-T$_{c}$ cuprates (2005)
Padilla, W. J., Lee, Y. S., Dumm, M., Blumberg, G., Ono, S., Segawa, Kouji, ...
We investigate the hole dynamics in two prototypical high temperature superconducting systems: La$_{2-x}$Sr$_{x}$CuO$_{4}$ and YBa$_{2}$Cu$_{3}% $O$_{y}$ using a combination of DC transport and...
Electrodynamics of the Nodal Metal in Weakly Doped High-$T_{c}$ Cuprates (2005)
Lee, Y. S., Segawa, Kouji, Li, Z. Q., Padilla, W. J., Dumm, M., Dordevic, S. V., ...
We report on the detailed analysis of the infrared (IR) conductivity of two prototypical high-$T_{c}$ systems YBa$_{2}$Cu$_{3}$O$_{y}$ and La$_{2-x}$Sr$%_{x}$CuO$_{4}$ throughout the complex phase...
Neutron scattering study of novel magnetic order in Na0.5CoO2 (2005)
Gasparovic, G., Ott, R. A., Chou, F. C., Chu, Y., Lynn, J. W., ...
We report polarized and unpolarized neutron scattering measurements of the magnetic order in single crystals of Na0.5CoO2. Our data indicate that below T_N=88 K the spins form a novel...
Lee, Y. S., Segawa, Kouji, Ando, Yoichi, Basov, D. N.
We report the infrared (IR) response of Cu-O chains in the high-$T_{c}$ superconductor YBa$_{2}$Cu$_{3}$O$_{y}$ over the doping range spanning $% y=6.28-6.75$. We find evidence for a power law...
Spin chirality on a two-dimensional frustrated lattice (2005)
Grohol, D., Matan, K., Cho, J. H., Lynn, J. W., Nocera, D. G., ...
The collective behavior of interacting magnetic moments can be strongly influenced by the topology of the underlying lattice. In geometrically frustrated spin systems, interesting chiral correlations...
Lee, Y.S., Choi, K.S., Kim, M.C., Han, J.C., Park, J.S., Shah, D.H., ...
Fowl typhoid caused by Salmonella Gallinarum is a severe systemic disease of poultry characterized by high mortality, morbidity, reduced egg production and heavy economic losses due to culling of...
Spin gap formation in the quantum spin systems TiOX, X=Cl and Br (2005)
Lemmens, P., Choi, K. Y., Valenti, R., Saha-Dasgupta, T., Abel, E., Lee, Y. S., ...
In the layered quantum spin systems TiOCl and TiOBr the magnetic susceptibility shows a very weak temperature dependence at high temperatures and transition-induced phenomena at low temperatures....
Spin gap formation in the quantum spin systems TiOX, X=Cl and Br (2005)
Lemmens, P., Choi, K. Y., ValentÃ, R., Saha-Dasgupta, T., Abel, E., Lee, Y. S., ...
Khaykovich, B., Wakimoto, S., Birgeneau, R. J., Kastner, M. A., Lee, Y. S., Smeibidl, P., ...
We report the observation of a magnetic-field-induced transition between magnetically disordered and ordered phases in slightly under-doped La(2-x)SrxCuO4 with x=0.144. Static incommensurate...
Structural transition in NaxCoO2 with x near 0.75 due to Na rearrangement (2004)
Huang, Q., Khaykovich, B., Chou, F. C., Cho, J. H., Lynn, J. W., Lee, Y. S.
We report neutron powder diffraction measurements on a series of NaxCoO2 samples with x near 0.75 which were prepared under different synthesis conditions. Two different crystal structures for the...
Electrochemical De-intercalation, Oxygen Non-stoichiometry, and Crystal Growth of NaxCoO2-d (2004)
Chou, F. C., Abel, E. T., Cho, J. H., Lee, Y. S.
We report a detailed study of de-intercalation of Na from the compound NaxCoO2-d using an electrochemical technique. We find evidence for stable phases with Na contents near the fractions ~1/3, 1/2,...
Magnetic susceptibility study of hydrated and non-hydrated NaxCoO2-yH2O single crystals (2004)
Chou, F. C., Cho, J. H., Lee, Y. S.
We have measured the magnetic susceptibility of single crystal samples of non-hydrated NaxCoO2 (x ~ 0.75, 0.67, 0.5, and 0.3) and hydrated Na0.3CoO2-yH2O (y ~ 0, 0.6, 1.3). Our measurements reveal...
TIPS: A Translingual Information Processing System (2004)
Y. Al-onaizan, R. Florian, M. Franz, H. Hassan, Y. S. Lee, S. Mccarley, ...
Searching online information is increasingly a daily activity for many people. The multilinguality of online content is also increasing (e.g. the proportion of English web users, which has been...
Evidence for an incommensurate magnetic resonance in La(2-x)Sr(x)CuO(4) (2003)
Tranquada, J. M., Lee, C. H., Yamada, K., Lee, Y. S., Regnault, L. P., Ronnow, H. M.
We study the effect of a magnetic field (applied along the c-axis) on the low-energy, incommensurate magnetic fluctuations in superconducting La(1.82)Sr(0.18)CuO(4). The incommensurate peaks at 9...
Jorge, G. A., Jaime, M., Civale, L., Batista, C. D., Zink, B. L., Hellman, F., ...
We have measured the specific heat and magnetization {\it versus} temperature in a single crystal sample of superconducting La$_{2}$CuO$_{4.11}$ and in a sample of the same material after removing...
Lee, Y. S., Chou, F. C., Tewary, A., Kastner, M. A., Lee, S. H., Birgeneau, R. J.
We report neutron scattering measurements of the structure and magnetism of stage-4 La_2CuO_{4+y} with T_c ~42 K. Our diffraction results on a single crystal sample demonstrate that the excess oxygen...
1H fast MAS NMR studies of hydrogen-bonding interactions in self-assembled monolayers (2003)
Pawsey,S., McCormick,M., De Paul,S., Graf,Robert, Lee,Y. S., Reven,L., ...
The structures formed by the adsorption of carboxyalkylphosphonic acids on metal oxides were investigated by 1H fast magic angle spinning (MAS), heteronuclear correlation (HETCOR), and 1H...
1H fast MAS NMR studies of hydrogen-bonding interactions in self-assembled monolayers (2003)
Pawsey, S., McCormick, M., De Paul, S., Graf, Robert, Lee, Y. S., Reven, L., ...
The structures formed by the adsorption of carboxyalkylphosphonic acids on metal oxides were investigated by 1H fast magic angle spinning (MAS), heteronuclear correlation (HETCOR), and 1H...
Khaykovich, B., Birgeneau, R. J., Chou, F. C., Erwin, R. W., Kastner, M. A., ...
We have measured the enhancement of the static incommensurate spin-density wave (SDW) order by an applied magnetic field in stage-4 and stage-6 samples of superconducting La2CuO(4+y). We show that...
Electron and orbital correlations in Ca_{2-x}Sr_{x}RuO_{4} probed by optical spectroscopy (2002)
Lee, J. S., Lee, Y. S., Noh, T. W., Yu, Jaejun, Nakatsuji, S., ...
The doping and temperature dependent optical conductivity spectra of the quasi-two-dimensional Ca_{2-x}Sr_xRuO_4 (0.0=
Lee, Y. S., Lee, J. S., Noh, T. W., Byun, Douck-Young, Yoo, Kwang Soo, Yamaura, K., ...
We investigated the electronic structures of the perovskite-type 4$d$ transition metal oxides Sr$M$O$_3$ ($M$ = Zr, Mo, Ru, and Rh) using their optical conductivity spectra $\sigma (\omega)$. The...
Temperature-dependent Raman spectroscopy in BaRuO$_3$ systems (2002)
Lee, Y. S., Noh, T. W., Park, J. H., Cao, G., Crow, J. E., ...
We investigated the temperature-dependence of the Raman spectra of a nine-layer BaRuO$_3$ single crystal and a four-layer BaRuO$_3$ epitaxial film, which show pseudogap formations in their metallic...
Lee, Y. S., Yu, Jaejun, Lee, J. S., Noh, T. W., Choi, Han-Yong, ...
Optical conductivity spectra $\sigma_1(\omega)$ of paramagnetic CaRuO$_3$ are investigated at various temperatures. At T=10 K, it shows a non-Fermi liquid behavior of $\sigma_1(\omega)\sim...
Savici, A. T., Fudamoto, Y., Gat, I. M., Ito, T., Larkin, M. I., Uemura, Y. J., ...
This paper reports muon spin relaxation (MuSR) measurements of two single crystals of the title high-Tc cuprate systems where static incommensurate magnetism and superconductivity coexist. By...
Spin Wave Propagation in the Domain State of a Random Field Magnet (2002)
Leheny, R. L., Lee, Y. S., Shirane, G., Birgeneau, R. J.
Inelastic neutron scattering with high wave-vector resolution has characterized the propagation of transverse spin wave modes near the antiferromagnetic zone center in the metastable domain state of...
Enhancement of long-range magnetic order by magnetic field in superconducting La2CuO(4+y) (2001)
Khaykovich, B., Lee, Y. S., Erwin, R., Wakimoto, S., Thomas, K. J., ...
We report a detailed study, using neutron scattering, transport and magnetization measurements, of the interplay between superconducting (SC) and spin density wave (SDW) order in La2CuO(4+y). Both...
Pseudogap formation of four-layer BaRuO$_3$ and its electrodynamic response changes (2001)
Lee, Y. S., Lee, J. S., Kim, K. W., Noh, T. W., Yu, Jaejun, Bang, Yunkyu, ...
We investiaged the optical properties of four-layer BaRuO$_{3}$, which shows a fermi-liquid-like behavior at low temperature. Its optical conductivity spectra clearly displayed the formation of a...
Lee, J. S., Lee, Y. S., Noh, T. W., Char, K., Park, Jonghyurk, ...
We investigated the electronic structures of the bandwidth-controlled ruthenates, Y$_{2}$Ru$_{2}$O$_{7}$, CaRuO$_{3}$, SrRuO$_{3}$, and Bi$_{2}$Ru$% _{2}$O$_{7}$, by optical conductivity analysis in...
Spin Fluctuations in the Underdoped High-Tc Cuprate La1.93Sr0.07CuO4 (2001)
Hiraka, H., Endoh, Y., Fujita, M., Lee, Y. S., Kulda, J., Ivanov, A., ...
We performed magnetic inelastic neutron-scattering experiments on La(1.93)Sr(0.07)CuO(4) over a wide range of E and T;2 < E < 44 meV and 1.5 < T < 300 K. The dynamic susceptibility X"(q,E) of this...
Gardonio, P., Lee, Y.S., Elliott, S.J., Debost, S.
This paper presents a theoretical and experimental study of a smart panel designed for active structural acoustic control. The system consists of a clamped aluminium panel 1 mm thick with dimensions...
Wakimoto, S., Birgeneau, R. J., Lee, Y. S., Shirane, G.
Recent neutron scattering measurements on the La2-xSrxCuO4 system have revealed a drastic change of the incommensurate static spin correlations from diagonal in the insulating region to parallel in...
K. W. Siu, Y. S. Lee, C. K. Tse
Based on a single-stage isolated power-factor-corrected power supply (SSIPP or S 2 IP 2 ) employing a boost powerfactor -correction (PFC) cell, the relationship between the input line voltage and...
Neutron Scattering study of Sr_2Cu_3O_4Cl_2 (2000)
Kim, Y. J., Birgeneau, R. J., Chou, F. C., Greven, M., Kastner, M. A., Lee, Y. S., ...
We report a neutron scattering study on the tetragonal compound Sr_2Cu_3O_4Cl_2, which has two-dimensional (2D) interpenetrating Cu_I and Cu_{II} subsystems, each forming a S=1/2 square lattice...
Pulsed Neutron Source using 100-MeV electron Linac at Pohang Accelerator Laboratory (2000)
Kim, G. N., Kang, H. S., Lee, Y. S., Cho, M. H., Ko, I. S., Namkung, W.
The Pohang Accelerator Laboratory operates an electron linac for the pulsed neutron source as one of the long-term nuclear R&D programs at the Korea Atomic Energy Research Institute. The designed...