Spin Order and Excitations in Triangular Antiferromagnet La2Ca2MnO7 (2009)
Bao, Wei, Wang, Y. X., Qiu, Y., Li, K., Lin, J. H., Copley, J. R. D., ...
We report a spin S = 3/2 triangular antiferromagnet with nearest-neighbor coupling J = 0.29 meV in La2Ca2MnO7. A genuinely two-dimensional, three-sublattice order develops below 2.80 K
Ross, K. A., Ruff, J. P. C., Adams, C. P., Gardner, J. S., Dabkowska, H. A., Qiu, Y., ...
Time-of-flight neutron scattering measurements show the ferromagnetic XY pyrochlore Yb2Ti2O7 to display strong quasi-two dimensional (2D) spin correlations at low temperature, which give way to long...
Revisiting Static and Dynamic Spin Ice Correlations in Ho2Ti2O7 (2008)
Clancy, J. P., Ruff, J. P. C., Dunsiger, S. R., Zhao, Y., Dabkowska, H. A., Gardner, J. S., ...
Elastic and inelastic neutron scattering studies have been carried out on the pyrochlore magnet Ho2Ti2O7. Measurements in zero applied magnetic field show that the disordered spin ice ground state of...
Nanoscale freezing of the 2D spin liquid Pr$_{3}$Ga$_{5}$SiO$_{14}$ (2008)
Zhou, H. D., Wiebe, C. R., Balicas, L., Takano, Y., Case, M. J., ...
In this letter, we report on the single crystal growth and physical characterization of the distorted kagom\'{e} system Pr$_3$Ga$_5$SiO$_{14}$. It is found that at zero magnetic field the system...
Spin Waves and Quantum Criticality in the Frustrated XY Pyrochlore Antiferromagnet Er2Ti2O7 (2008)
Ruff, J. P. C., Clancy, J. P., Bourque, A., White, M. A., Ramazanoglu, M., Gardner, J. S., ...
We report detailed measurements of the low temperature magnetic phase diagram of Er$_2$Ti$_2$O$_7$. Heat capacity and time-of-flight neutron scattering studies of single crystals, subject to magnetic...
Itinerant spin excitations near the hidden order transition in URu2Si2 (2008)
Janik, J. A., Zhou, H. D., Balicas, L., MacDougall, G. J., Luke, G. M., ...
By means of neutron scattering we show that the high-temperature precursor to the hidden order state of the heavy fermion superconductor URu$_{2}$Si$_{2}$ exhibits heavily damped incommensurate...
Neutron scattering study of the oxypnictide superconductor La(O,F)FeAs (2008)
Qiu, Y., Kofu, M., Bao, Wei, Huang, Q., Yildirim, T., ...
The newly discovered superconductor La(O,F)FeAs (Tc = 26 K) was investigated using the neutron scattering technique. No spin-density-wave (SDW) order was observed in the normal state nor in the...
Roton-like mode in solid He-4 (2008)
Blackburn, E., Sinha, S. K., Broholm, C., Copley, J. R. D., Erwin, R. W., Goodkind, J. M.
Recent theoretical and experimental work on solid He-4 has focused on vacancies, or other lattice defects and whether these can form a Bose-Einstein condensate within the solid. The earliest...
Dunsiger, S. R., Zhao, Y., Gaulin, B. D., Qiu, Y., Bourges, P., Sidis, Y., ...
We have studied incommensurate spin ordering in single crystal underdoped La_{2-x}Ba_{x}CuO_{4} with x~0.08, 0.05 and 0.025 using neutron scattering techniques. Static incommensurate magnetic order...
Wiebe, C. R., Janik, J. A., Macdougall, G. J., Luke, G. M., Garrett, J. D., Zhou, H. D., ...
One of the primary goals of modern condensed matter physics is to elucidate the nature of the ground state in various electronic systems. Many correlated electron materials, such as high temperature...
Field Induced Order and Spin Waves in the Pyrochlore Antiferromagnet Tb2Ti2O7 (2006)
Rule, K. C., Ruff, J. P. C., Gaulin, B. D., Dunsiger, S. R., Gardner, J. S., Clancy, J. P., ...
High resolution time-of-flight neutron scattering measurements on Tb2Ti2O7 reveal a rich low temperature phase diagram in the presence of a magnetic field applied along [110]. In zero field at T=0.4...
Nano-magnetic droplets and implications to orbital ordering in La1-xSrxCoO3 (2005)
Phelan, D., Louca, Despina, Rosenkranz, S., Qiu, Y., Chupas, P. J., ...
Inelastic cold neutron scattering on LaCoO3 provided evidence for a distinct low energy excitation at 0.6 meV coincident with the thermally induced magnetic transition. Coexisting strong...
Ordering and Spin Waves in NaNiO2 : A Stacked Quantum Ferromagnet (2004)
Lewis, M. J., Gaulin, B. D., Filion, L., Kallin, C., Berlinsky, A. J., Dabkowska, H. A., ...
Neutron scattering measurements on powder NaNiO2 reveal magnetic Bragg peaks and spin waves characteristic of strongly correlated s=1/2 magnetic moments arranged in ferromagnetic layers which are...
Gaulin, B. D., Lee, S. H., Haravifard, S., Castellan, J. P., Berlinsky, A. J., Dabkowska, H. A., ...
High resolution, inelastic neutron scattering measurements on SrCu2(BO3)2 reveal the dispersion of the three single triplet excitations continuously across the (H,0) direction within its tetragonal...
A Neutron Elastic Diffuse Scattering Study of PMN (2003)
Xu, Guangyong, Shirane, G., Copley, J. R. D., Gehring, P. M.
We have performed elastic diffuse neutron scattering studies on the relaxor Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_3$ (PMN). The measured intensity distribution near a (100) Bragg peak in the (hk0) scattering...
Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO$_3$ (2003)
Sato, T. J., Katsufuji, T., Masaki, M., Park, S., Copley, J. R. D., ...
We used inelastic neutron scattering to show that well below its N\'{e}el temperature, $T_{\rm N}$, the two-dimensional (2D) XY nearly-triangular antiferromagnet YMnO$_{3}$ has a prominent {\it...
Spin excitations in 3D molecular magnets probed by neutron scattering (2002)
Bordallo, H.N., Chapon, L.C., Cook, J.C., Copley, J.R.D., Goremychkin, E., Kern, S., ...
The emerging field of molecular magnetism constitutes a new branch of materials science that deals with the magnetic properties of molecules, or assemblies of molecules, that contain magnetic...
Quantitative analysis of UH3 in U metal and UO2 matrices by neutron vibrational spectroscopy (2002)
Glagolenko, I.Y., Carney, K.P., Kern, S., Goremychkin, E.A., Udovic, T.J., Copley, J.R.D., ...
The ignition of UH3 has resulted in uranium fires. Neutron spectroscopy is proposed to quantify UH3 in fuel at risk. Spectra of UH3 in UO2 and U metal were obtained using two instruments at Argonne...