598 citations · 2k across the 29 of their papers we have counts for
29 papers
Electronic and Vibrational Excitations on the Surface of the Three-Dimensional Topological Insulator BiTeSe (x = 0, 2, 3)
A. Lee, H. -H. Kung, Xueyun Wang +2
We study surface states in the three-dimensional topological insulators BiTeSe (x = 0, 2, 3) by polarization resolved resonant Raman spectroscopy. By tracking the…
Neutron scattering sum rules, symmetric exchanges, and helicoidal magnetism in MnSbO
E. Chan, H. Lane, J. Pásztorová +9
MnSbO is based on the noncentrosymmetric space group with magnetic Mn (, ) spins ordering below K in a helicoidal…
Spin-phonon interactions and magnetoelectric coupling in CoO ( = Nb, Ta)
K. Park, J. Kim, S. Choi +10
In order to explore the consequences of spin-orbit coupling on spin-phonon interactions in a set of chemically-similar mixed metal oxides, we measured the infrared vibrational prop…
Band-Mott mixing hybridizes the gap in FeMoO
K. Park, G. L. Pascut, G. Khanal +9
We combined optical spectroscopy and first principles electronic structure calculations to reveal the charge gap in the polar magnet FeMoO. Iron occupation on the octah…
Nature of the Structural Symmetries Associated with Hybrid Improper Ferroelectricity in Ca3X2O7
S. Liu, H. Zhang, S. Ghose +8
In hybrid improper ferroelectric systems, polarization arises from the onset of successive nonpolar lattice modes. In this work, measurements and modeling were performed to determi…
Soft antiphase tilt of oxygen octahedra in the hybrid improper multiferroic Ca3Mn1.9Ti0.1O7
Feng Ye, Jinchen Wang, Jieming Sheng +13
We report a single crystal neutron and x-ray diffraction study of the hybrid improper multiferroic Ca3Mn1.9Ti0.1O7 (CMTO), a prototypical system where the electric polarization ari…
Magnetoelectric Phase Diagrams of Multiferroic GdMn2O5
S. H. Bukhari, Th. Kain, M. Schiebl +7
Electric and magnetic properties of multiferroic GdMn2O5 in external magnetic fields were investigated to map out the magnetoelectric phases in this material. Due to strong magneto…
Spontaneous decays of magneto-elastic excitations in noncollinear antiferromagnet (Y,Lu)MnO3
Joosung Oh, Manh Duc Le, Ho-Hyun Nahm +12
When magnons and phonons, the fundamental quasiparticles of the solid, are coupled to one another, they form a new hybrid quasi-particle, leading to novel phenomena and interesting…
Terahertz Spin-Orbital Excitations in the paramagnetic state of multiferroic SrFeSiO
Thuc T. Mai, C. Svoboda, M. T. Warren +5
We studied the novel multiferroic material SrFeSiO, and found 3 absorption modes above the magnetic ordering transition temperature using time-domain terahertz spectros…
Ferroelectric and Magnetic Domains in LuFe2O4 Observed by Scanning Probe Microscopy
I. K. Yang, J. Kim, S. H. Lee +3
LuFe2O4 is a multiferroic system which exhibits ferroelectricity, charge order, and ferrimagnetic order simultaneously below ~230 K. The ferroelectric domains of LuFe2O4 are imaged…
Quadrupolar Singlet Ground State of Praseodymium in a Modulated Pyrochlore
J. van Duijn, K. H. Kim, N. Hur +12
The complex structure and magnetism of PrBiRuO was investigated by neutron scattering and EXAFS. Pr has an approximate doublet ground-state and the first excite…
Magnon breakdown in a two dimensional triangular lattice Heisenberg antiferromagnet of multiferroic LuMnO
Joosung Oh, Manh Duc Le, Jaehong Jeong +7
The breakdown of magnons, the quasiparticles of magnetic systems, has rarely been seen. By using an inelastic neutron scattering technique we report the observation of spontaneous…
Dimerization-Induced Cross-Layer Quasi-Two-Dimensionality in Metallic Iridate IrTe2
G. L. Pascut, K. Haule, M. J. Gutmann +7
The crystal structure of layered metal IrTe2 is determined using single-crystal x-ray diffraction. At T=220 K, it exhibits Ir and Te dimers forming a valence-bond crystal. Electron…
Negative magnetostrictive magnetoelectric coupling of BiFeO3
Sanghyun Lee, M. T. Fernandez-Diaz, H. Kimura +8
How the magnetoelectric coupling actually occurs on a microscopic level in multiferroic BiFeO3 is not well known. By using the high-resolution single crystal neutron diffraction te…
X-ray imaging and multiferroic coupling of cycloidal magnetic domains in ferroelectric monodomain BiFeO3
R. D. Johnson, P. Barone, A. Bombardi +6
Magnetic domains at the surface of a ferroelectric monodomain BiFeO3 single crystal have been imaged by hard X-ray magnetic scattering. Magnetic domains up to several hundred micro…
Spin wave measurements over the full Brillouin zone of multiferroic BiFeO3
Jaehong Jeong, E. A. Goremychkin, T. Guidi +9
Using inelastic neutron scattering technique, we measured the spin wave dispersion over the entire Brillouin zone of room temperature multiferroic BiFeO3 single crystals with magne…
Spin waves and revised crystal structure of honeycomb iridate Na2IrO3
S. K. Choi, R. Coldea, A. N. Kolmogorov +11
We report inelastic neutron scattering measurements on Na2IrO3, a candidate for the Kitaev spin model on the honeycomb lattice. We observe spin-wave excitations below 5 meV with a…
Independent ferroelectric contributions and rare-earth-induced polarization reversal in multiferroic TbMn2O5
N. Leo, D. Meier, R. V. Pisarev +3
Three independent contributions to the magnetically induced spontaneous polarization of multiferroic TbMn2O5 are uniquely separated by optical second harmonic generation and an ana…
Optical identification of hybrid magnetic and electric excitations in Dy3Fe5O12 garnet
P. D. Rogers, Y. J. Choi, E. Standard +10
Far-infrared spectra of magneto-dielectric Dy3Fe5O12 garnet were studied between 13 and 100 cm-1 and at low temperatures between 5 and 80 K. A combination of transmission, reflecti…
Origin of Electric Field Induced Magnetization in Multiferroic HoMnO3
B. G. Ueland, J. W. Lynn, M. Laver +2
We have performed polarized and unpolarized small angle neutron scattering experiments on single crystals of HoMnO3 and have found that an increase in magnetic scattering at low mo…
Giant Magnetoelectric Effect in a Multiferroic Material with a High Ferroelectric Transition Temperature
N. Hur, I. K. Jeong, M. F. Hundley +2
We present a unique example of giant magnetoelectric effect in a conventional multiferroic HoMnO3, where polarization is very large (~56 mC/m2) and the ferroelectric transition tem…
Spin-Charge-Lattice Coupling through Resonant Multi-Magnon Excitations in Multiferroic BiFeO3
M. O. Ramirez, A. Kumar, S. A. Denev +19
Spin-charge-lattice coupling mediated by multi-magnon processes is demonstrated in multiferroic BiFeO3. Experimental evidence of two and three magnons excitations as well as multim…
First-order transition in the itinerant ferromagnet CoSSe
T. J. Sato, J. W. Lynn, Y. S. Hor +1
Undoped CoS is an isotropic itinerant ferromagnet with a continuous or nearly continuous phase transition at K. In the doped CoSSe system, the…
Nanoscale anisotropic structural correlations in the paramagnetic and ferromagnetic phases of Nd0.5Sr0.5 MnO3
V. Kiryukhin, B. G. Kim, T. Katsufuji +2
We report x-ray scattering studies of short-range structural correlations and diffuse scattering in Nd0.5Sr0.5MnO3. On cooling, this material undergoes a series of transitions, fir…