Publications (22)
Magnetic excitations in multiferroic LuMnO3 studied by inelastic neutron scattering
H. J. Lewtas, A. T. Boothroyd, M. Rotter +6
We present data on the magnetic and magneto-elastic coupling in the hexagonal multiferroic manganite LuMnO3 from inelastic neutron scattering, magnetization and thermal expansion m…
Role of crystal field ground state in the classical spin-liquid behavior of a quasi-one dimensional spin-chain system Sr3NiPtO6
V. K. Anand, D. T. Adroja, S. Rayaprol +5
The spin-chain compound Sr3NiPtO6 is known to have a nonmagnetic ground state. We have investigated the nature of ground state of Sr3NiPtO6 using magnetic susceptibility , h…
Crystal-fields in YbInNi4 determined with magnetic form factor and inelastic neutron scattering
A. Severing, F. Givord, J. -X. Boucherle +9
The magnetic form factor of YbInNi4 has been determined via the flipping ratios R with polarized neutron diffraction and the scattering function S(Q,w) was measured in an inelastic…
Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
Y. Su, P. Link, A. Schneidewind +9
Neutron diffraction experiments have been carried out on a Sn-flux grown BaFe2As2 single crystal, the parent compound of the A-122 family of FeAs-based high-Tc superconductors. A t…
Electronic and magnetic nano phase separation in cobaltates LaSrCoO
Z. W. Li, Y. Drees, A. Ricci +11
The single-layer perovskite cobaltates have attracted enormous attention due to the recent observation of hour-glass shaped magnetic excitation spectra which resemble the ones of t…
Extremely slow non-equilibrium monopole dynamics in classical spin ice
T. Stöter, M. Doerr, S. Granovsky +7
We report on the non-equilibrium monopole dynamics in the classical spin ice DyTiO detected by means of high-resolution magnetostriction measurements. Significant latti…
Ab initio lattice dynamics simulations and inelastic neutron scattering spectra for studying phonons in BaFe2As2: Effect of structural phase transition, structural relaxation and magnetic ordering
M. Zbiri, H. Schober, M. R. Johnson +5
We have performed extensive ab initio calculations to investigate phonon dynamics and their possible role in superconductivity in BaFe2As2 and related systems. The calculations are…
Inelastic neutron scattering and lattice dynamical calculations in BaFe2As2
R. Mittal, Y. Su, S. Rols +6
We report here first extensive measurements of the temperature dependence of phonon density of states of BaFe2As2, the parent compound of the newly discovered FeAs-based supercondu…
Measurement of spin-dependent total cross-section difference in neutron-proton scattering at 16 MeV
J. Broz, J. Cerny, Z. Dolezal +15
A new measurement of for polarized neutrons transmitted through a polarized proton target at 16.2 MeV has been made. A polarized neutron beam was obtained from the $^{3}\r…
Magnetic anisotropy and dipolar interactions in the frustrated triangular-lattice magnet NaGdS_2
J. Grumbach, E. HäuÃler, S. Luther +12
In this comprehensive study, we present results of bulk measurements (magnetization, specific heat, ac susceptibility, thermal expansion, and magnetostriction) combined with local…
Electronic structure studies of BaFe2As2 by angle-resolved photoemission spectroscopy
J. Fink, S. Thirupathaiah, R. Ovsyannikov +12
We report high resolution angle-resolved photoemission spectroscopy (ARPES) studies of the electronic structure of BaFeAs, which is one of the parent compounds of the Fe-pn…
Mechanism of spin crossover in LaCoO3 resolved by shape magnetostriction in pulsed magnetic fields
M. Rotter, Z. -S. Wang, A. T. Boothroyd +3
In the scientific description of unconventional transport properties of oxides (spin-dependent transport, superconductivity etc.), the spin-state degree of freedom plays a fundamen…
Superconductivity in novel Ge-based skutterudites: {Sr,Ba}Pt_4Ge_{12}
E. Bauer, A. Grytsiv, Xing-Qiu Chen +9
Combining experiments and ab initio models we report on and as members of a novel class of superconducting skutterudites, where Sr or Ba ato…
Nonlinear acousto-electric transport in a two-dimensional electron system
A. O. Govorov, A. V. Kalameitsev, M. Rotter +4
We study both theoretically and experimentally the nonlinear interaction between an intense surface acoustic wave and a two-dimensional electron plasma in semiconductor-piezocrysta…
Quantum spin liquid ground state in a rare-earth triangular antiferromagnet SmTaO
Dhanpal Bairwa, Abhisek Bandyopadhyay, Devashibhai Adroja +9
The rare-earth-based geometrically frustrated triangular magnets have attracted considerable attention due to the intricate interplay between strong spin-orbit coupling and the cry…
Magnetic and superconducting transitions in BaKFeAs studied by specific heat
Ch. Kant, J. Deisenhofer, A. Günther +4
We report on specific heat measurements in BaKFeAs (). For the underdoped sample with both the spin-density-wave transition at K…
New insight into the physics of iron pnictides from optical and penetration depth data
S. -L. Drechsler, H. Rosner, M. Grobosch +12
We report theoretical values for the unscreened plasma frequencies Omega_p of several Fe pnictides obtained from DFT based calculations within the LDA and compare them with experim…
Spectroscopic evidence for giant orbital moment and magnetic anisotropy induced by local distortions in alpha-CoV2O6
N. Hollmann, S. Agrestini, Z. Hu +9
We present a combined experimental and theoretical study on the local magnetism of the Co ions in the spin-chain compound CoV2O6, which crystallizes in two different allotropic pha…
Specific heat in different magnetic phases of RNi2B2C (R= Gd, Ho, Er): theory and experiment
M. ElMassalami R. M. Saeed, C. M. Chaves, H. Takeya +3
The borocarbides RNi2B2C (R=Gd, Ho, Er) exhibit a large variety of magnetic states and as a consequence rich phase diagrams. We have analyzed the nature of these states by specific…
Contrasting magnetic behavior in MnSc_2X_4 (X = S, Se) spinel compounds investigated by magnetoelastic studies
J. Grumbach, J. Sourd, M. Deeb +12
The spinel compounds MnSc_2X_4 are highly frustrated and candidate materials for vortex-like 3q magnetic states, such as skyrmions, with propagation vectors in the [111] plane. Bec…
Magnetic ordering in GdNi2B2C revisited by resonant x-ray scattering: evidence for the double-q model
P. S. Normile, M. Rotter, C. Detlefs +3
Recent theoretical efforts aimed at understanding the nature of antiferromagnetic ordering in GdNi2B2C predicted double-q ordering. Here we employ resonant elastic x-ray scattering…
Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides LaSrCoO
Y. Drees, Z. W. Li, A. Ricci +10
The magnetic excitations in the cuprate superconductors might be essential for an understanding of high-temperature superconductivity. In these cuprate superconductors the magnetic…