Evolution of spin excitations into the superconducting state in FeTe1-xSex (2009)
Lumsden, M. D., Christianson, A. D., Goremychkin, E. A., Nagler, S. E., Mook, H. A., Stone, M. B., ...
The nature of the superconducting state in the recently discovered Fe-based superconductors1-3 is the subject of intense scrutiny. Neutron scattering investigations have already elucidated a strong...
Mook, H. A., Lumsden, M. D., Christianson, A. D., Sales, Brian C., Jin, Rongying, McGuire, Michael A., ...
The discovery of the Fe pnictide superconductors generated great interest as the structure consists of planes of a magnetic material quite similar to the cuprate superconductors. Fe(Te0.5Se0.5) is a...
Static and Dynamic Magnetism in Underdoped Superconductor BaFe$_{1.92}$Co$_{0.08}$As$_2$ (2009)
Christianson, A. D., Lumsden, M. D., Nagler, S. E., MacDougall, G. J., McGuire, M. A., Sefat, A. S., ...
We report neutron scattering measurements on single crystals of BaFe$_{1.92}$Co$_{0.08}$As$_2$. The magnetic Bragg peak intensity is reduced by 6 % upon cooling through T$_C$. The spin dynamics...
Spin Excitations in BaFe1.84Co0.16As2 Superconductor Observed by Inelastic Neutron Scattering (2009)
Parshall, D., Lokshin, K. A., Niedziela, Jennifer, Christianson, A. D., Lumsden, M. D., Mook, H. A., ...
Superconductivity appears to compete against the spin-density-wave in Fe pnictides. However, optimally cobalt doped samples show a quasi-two-dimensional spin excitation centered at the (0.5, 0.5, L)...
Neutron scattering evidence for isolated spin-1/2 ladders in (C$_5$D$_{12}$N)$_2$CuBr$_4$ (2009)
Savici, A. T., Granroth, G. E., Broholm, C. L., Pajerowski, D. M., Brown, C. M., Talham, D. R., ...
Inelastic neutron scattering was used to determine the spin Hamiltonian for the singlet ground state system of fully deuterated BPCB, (C$_{5}$D$_{12}$N)$_{2}$CuBr$_{4}$. A 2-leg spin-1/2 ladder...
Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2 (2008)
Lumsden, M. D., Christianson, A. D., Parshall, D., Stone, M. B., Nagler, S. E., MacDougall, G. J., ...
Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wavevectors (1/2 1/2 L) in tetragonal notation. On cooling...
Charge order in LuFe2O4: antiferroelectric ground state and coupling to magnetism (2008)
Angst, M., Hermann, R. P., Christianson, A. D., Lumsden, M. D., Lee, C., ...
X-ray scattering by multiferroic LuFe2O4 is reported. Below 320 K, superstructure reflections indicate an incommensurate charge order with propagation close to (1/3,1/3,3/2). The corresponding charge...
Neutron diffraction in a model itinerant metal near a quantum critical point (2008)
Sokolov, D. A., Aronson, M. C., Erwin, R., Lynn, J. W., Lumsden, M. D., Nagler, S. E.
Neutron diffraction measurements on single crystals of Cr1-xVx (x=0, 0.02, 0.037) show that the ordering moment and the Neel temperature are continuously suppressed as x approaches 0.037, a proposed...
Three Dimensional Magnetic Correlations in Multiferroic LuFe2O4 (2007)
Christianson, A. D., Lumsden, M. D., Angst, M., Yamani, Z., Tian, W., Jin, R., ...
We present single-crystal neutron diffraction measurements on multiferroic LuFe2O4 showing phase transitions at 240 and 175 K. Magnetic reflections are observed below each transition indicating that...
Magnetic and orbital ordering in the spinel MnV2O4 (2007)
Garlea, V. O., Jin, R., Mandrus, D., Roessli, B., Huang, Q., Miller, M., ...
Neutron inelastic scattering and diffraction techniques have been used to study the MnV2O4 spinel system. Our measurements show the existence of two transitions to long-range ordered ferrimagnetic...
Quantum spin correlations in an organometallic alternating sign chain (2007)
Stone, M. B., Tian, W., Lumsden, M. D., Granroth, G. E., Mandrus, D., ...
High resolution inelastic neutron scattering is used to study excitations in the organometallic magnet DMACuCl$_3$. The correct magnetic Hamiltonian describing this material has been debated for many...
Elastic neutron scattering in Quantum Critical Antiferromagnet Cr$_{0.963}$V$_{0.037}$ (2007)
Sokolov, D. A., Aronson, M. C., Strycker, G. L., Lumsden, M. D., Nagler, S. E., Erwin, R.
We have performed elastic neutron scattering studies of the quantum critical antiferromagnet Cr$_{0.963}$V$_{0.037}$. We have found that unlike pure Cr, which orders at two incommensurate...
Magnetic Excitation Spectrum of the Square Lattice S=1/2 Heisenberg Antiferromagnet K2V3O8 (2006)
Lumsden, M. D., Nagler, S. E., Sales, B. C., Tennant, D. A., McMorrow, D. F., ...
We have explored the magnetic excitation spectrum of the S=1/2 square lattice Heisenberg antiferromagnet, K2V3O8 using both triple-axis and time-of-flight inelastic neutron scattering. The...
Excitation spectrum of a model antiferromagnetic spin-trimer (2006)
Stone, M. B., Fernandez-Alonso, F., Adroja, D. T., Dalal, N. S., Villagran, D., Cotton, F. A., ...
We present an inelastic neutron scattering (INS) study of the excitation spectrum of a model S = 1/2 equilateral Heisenberg trimer, Cu_3(O_2C_16H_23)_6.1.2C_6H_12. Earlier measurements were...
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...
Temperature dependent bilayer ferromagnetism in Sr3Ru2O7 (2006)
Stone, M. B., Lumsden, M. D., Jin, R., Sales, B. C., Qiu, Y., Mandrus, D., ...
The Ruthenium based perovskites exhibit a wide variety of interesting collective phenomena related to magnetism originating from the Ru 4d electrons. Much remains unknown concerning the nature of...
Field Dependent Phase Diagram of the Quantum Spin Chain (CH3)2NH2CuCl3 (2005)
Stone, M. B., Tian, W., Murphy, T. P., Nagler, S. E., Mandrus, D. G.
Although (CH3)2NH2CuCl3 (MCCL) was first examined in the 1930's [1], there are open questions regarding the magnetic dimensionality and nature of the magnetic properties. MCCL is proposed to be a...
Spin-dynamics of the low-dimensional magnet (CH3)2NH2CuCl3 (2005)
Stone, M. B., Tian, W., Granroth, G. E., Lumsdena, M. D., Chung, J-H., Mandrusa, D. G., ...
Dimethylammonium copper (II) chloride (also known as DMACuCl3 or MCCL) is a low dimensional S=1/2 quantum spin system proposed to be an alternating ferro-antiferromagnetic chain with similar...
Magnetic excitations in {Mo72Fe30} (2005)
Garlea, V. O., Nagler, S. E., Zarestky, J. L., Stassis, C., Vaknin, D., Kogerler, P., ...
We report cold-neutron inelastic neutron scattering measurements on deuterated samples of the giant polyoxomolybdate magnetic molecule {Mo72Fe30}. The 30 s = 5/2 Fe+3 ions occupy the vertices of an...
Lake, B., Tennant, D. A., Nagler, S. E.
The spin dynamics of coupled spin-1/2, antiferromagnetic Heisenberg chains is predicted to exhibit a novel longitudinal mode at low energies and temperatures below the Neel temperature. This mode is...
Quantum criticality and universal scaling of a quantum antiferromagnet (2005)
Lake, B., Tennant, D. A., Frost, C. D., Nagler, S. E.
Quantum effects dominate the behaviour of many diverse materials. Of particular current interest are those systems in the vicinity of a quantum critical point (QCP). Their physical properties are...
Magnetic excitations in the orbitally degenerate triangular lattice LiVO2 (2005)
Tian, W, Stone, MB, Mandrus, DG, Sales, BC, Jin, R, Adroja, D T, ...
We report an inelastic-neutron scattering study of the magnetic excitations in LiVO2, a two-dimensional triangular lattice of V3+ (S ΒΌ 1) ions with orbital ordering involving threefold degenerate...
A neutron scattering study of two-magnon states in the quantum magnet copper nitrate (2002)
Tennant, D. A., Broholm, C., Reich, D. H., Nagler, S. E., Granroth, G. E., Barnes, T., ...
We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate (Cu(NO3)2*2.5D2O). Using inelastic neutron scattering we have measured the one and two...
Structural Ordering and Symmetry Breaking in Cd_2Re_2O_7 (2002)
Castellan, J. P., Gaulin, B. D., Van Duijn, J., Lewis, M. J., Lumsden, M. D., Jin, R., ...
Single crystal X-ray diffraction measurements have been carried out on Cd_2Re_2O_7 near and below the phase transition it exhibits at Tc' ~195 K. Cd_2Re_2O_7 was recently discovered as the first, and...
Neutron-scattering studies of the S = 2 antiferromagnetic chain MnCl3C10D8N2 (2002)
Granroth, G E, Nagler, S E, Coldea, R, Eccleston, R S, Ward, B H, Talham, D R, ...
Zone-boundary excitations in coupled Haldane spin chain compounds PbNi2V2O8 and SrNi2V2O8 (2001)
Zheludev, A., Masuda, T., Uchinokura, K., Nagler, S. E.
Magnetic excitations in the quasi-one-dimensional quantum antiferromagnets PbNi2V2O8 and SrNi2V2O8 are measured all the way up to the zone boundary energy using inelastic neutron scattering from...
Watson, B. C., Kotov, V. N., Meisel, M. W., Hall, D. W., Granroth, G. E., Montfrooij, W. T., ...
The magnetization, $M(H \leq 30$ T, 0.7 K $\leq T \leq 300$ K), from single crystals and powder samples of (C$_{5}$H$_{12}$N)$_{2}$CuBr$_{4}$ has been used to identify this system as an $S=1/2$...
Weak ferromagnetism and field-induced spin reorientation in K2V3O8 (2000)
Lumsden, M. D., Sales, B. C., Mandrus, D., Nagler, S. E., Thompson, J. R.
Magnetization and neutron diffraction measurements indicate long-range antiferromagnetic ordering below TN=4 K in the 2D, S=1/2 Heisenberg antiferromagnet K2V3O8. The ordered state exhibits ``weak...
Quantum and classical dynamics in complex one-dimensional antiferromagnets (2000)
Zheludev, A., Maslov, S., Yokoo, T., Akimitsu, J., Raymond, S., Nagler, S. E.
Of great recent interest in condensed matter physics are phenomena of coexistence of quantum and classical properties in the same material. Such duality occurs in certain mixed-spin antiferromagnets...
Long-range antiferromagnetic order in the S=1 chain compound LiVGe2O6 (2000)
Lumsden, M. D., Granroth, G. E., Mandrus, D., Nagler, S. E., Thompson, J. R., Castellan, J. P., ...
The phase transition in the compound LiVGe2O6 has been proposed as a unique example of a spin-Peierls transition in an S=1 antiferromagnetic chain. We report neutron and x-ray diffraction...
Two-magnon states in Cu(NO3)2*2.5D2O using inelastic neutron scattering (2000)
Tennant, D. A., Broholm, C., Reich, Daniel H., Nagler, S. E., Granroth, G. E., Barnes, T., ...
We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate (\QTR{group}{Cu(NO$_{3}$)$_{2}\cdot 2.5$D$_{2}$O}). Using inelastic neutron scattering,...
A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3 (1999)
Lake, B., Tennant, D. A., Nagler, S. E.
Inelastic neutron scattering measurements are reported that show a new longitudinal mode in the antiferromagnetically ordered phase of the spin-1/2 quasi-one-dimensional antiferromagnet KCuF3. This...
Zheludev, A., Maslov, S., Yokoo, T., Akimitsu, J., Raymond, S., Nagler, S. E., ...
Inelastic neutron scattering experiments on Nd2BaNiO5 single-crystals and powder samples are used to study the dynamic coupling of 1-dimensional Haldane-gap excitations in the S=1 Ni2+ -chains to...
The Origin of Extra Modes in (VO)_2P_2O_7 (1999)
Recent inelastic neutron scattering experiments on (VO)_2P_2O_7 (VOPO) have seen previously unanticipated sharp peaks in the dynamic structure factor in addition to the pair of triplet modes observed...
Polarized-neutron study of longitudinal Haldane-gap excitations in Nd$_2$BaNiO$_5$ (1998)
Raymond, S., Yokoo, T., Zheludev, A., Nagler, S. E., Wildes, A., Akimitsu, J.
Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd2BaNiO5. The longitudinal mode, polarized along the...
The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field (1997)
Zheludev, A., Maslov, S., Shirane, G., Sasago, Y., Koide, N., Uchinokura, K., ...
The magnetic structure of Ba_2CuGe_2O_7 is investigated by neutron diffraction in magnetic fields applied along several directions in the $(a,b)$ plane of the crystal. In relatively weak fields,...
Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7 (1997)
Garrett, A. W., Nagler, S. E., Tennant, D. A., Sales, B. C., Barnes, T.
Magnetic excitations in an array of (VO)_2P_2O_7 single crystals have been measured using inelastic neutron scattering. Until now, (VO)_2P_2O_7 has been thought of as a two-leg antiferromagnetic...
Excitation Spectrum and Superexchange Pathways in the Spin Dimer VODPO_4 . 1/2 D_2O (1997)
Tennant, D. A., Nagler, S. E., Garrett, A. W., Barnes, T., Torardi, C. C.
Magnetic excitations have been investigated in the spin dimer material VODPO_4 \cdot 1/2 D_2O using inelastic neutron scattering. A dispersionless magnetic mode was observed at an energy of 7.81(4)...
A Neutron Scattering Study of Magnetic Excitations in the Spin Ladder (VO)2P2O7 (1996)
Garrett, A. W., Nagler, S. E., Barnes, T., Sales, B. C.
In this letter we report results from inelastic neutron scattering experiments on powder samples of vanadyl pyrophosphate, (VO)2P2O7. We see evidence for three magnetic excitations, at 3.5 meV, 6.0...
Energy levels of Co2+ in CoF2 and CsCoCl3 (1995)
Nguyen, T, Nagler, S E, Cowley, R A, Perring, T G, Osborn, R
Neutron scattering study of spin excitations in CsCoCl3 (1995)
Goff, J P, Tennant, D A, Cowley, R A, Ward, R C C, Nagler, S E, Perring, T G
Spin dynamics of a Heisenberg S=1/2 antiferromagnetic chain (1993)
Cowley, R A, Tennant, D A, Perring, T G, Nagler, S E, Tsvelik, A M
Neutron scattering study of quantum excitations in a S=1/2 Heisenberg antiferromagnetic chain (1992)
Nagler, S E, Tennant, D A, Cowley, R A, Satija, S K, Perring, T G, Taylor, A D, ...
Spin dynamics in the quantum antiferromagnetic chain compound KCuF3 (1991)
Nagler, S E, Tennant, D A, Cowley, R A, Perring, T G, Satija, S K
The freezing transition of monolayer xenon on single crystal graphite (1985)
Specht, E.D., Birgeneau, R.J., D'Amico, K.L., Moncton, D.E., Nagler, S.E., Horn, P.M.
Synchrotron X-ray diffraction studies of the freezing transition of monolayer xenon on single crystal graphite are reported. The system displays a continuous evolution from an oriented fluid to an...
The freezing transition of monolayer xenon on single crystal graphite (1985)
Specht, E.D., Birgeneau, R.J., D'Amico, K.L., Moncton, D.E., Nagler, S.E., Horn, P.M.
Synchrotron X-ray diffraction studies of the freezing transition of monolayer xenon on single crystal graphite are reported. The system displays a continuous evolution from an oriented fluid to an...
The freezing transition of monolayer xenon on single crystal graphite (1985)
Specht, E.D., Birgeneau, R.J., D'Amico, K.L., Moncton, D.E., Nagler, S.E., Horn, P.M.
Synchrotron X-ray diffraction studies of the freezing transition of monolayer xenon on single crystal graphite are reported. The system displays a continuous evolution from an oriented fluid to an...