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Orbital characters of three-dimensional Fermi surfaces in Eu2-xSrxNiO4 as probed by soft-x-ray angle-resolved photoemission spectroscopy
M. Uchida, K. Ishizaka, P. Hansmann +13
The three-dimensional Fermi surface structure of hole-doped metallic layered nickelate Eu2-xSrxNiO4 (x=1.1), an important counterpart to the isostructural superconducting cuprate L…
Electronic phase transitions in PrCaMnO epitaxial thin films revealed by resonant soft x-ray scattering
H. Wadati, J. Geck, E. Schierle +7
We report the study of magnetic and orbital order in PrCaMnO epitaxial thin films grown on (LaAlO)-(SrAlTaO) (LSAT) (011…
Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO
P. D. C. King, R. H. He, T. Eknapakul +13
We demonstrate the formation of a two-dimensional electron gas (2DEG) at the surface of the transition-metal oxide KTaO. From angle-resolved photoemission, we find…
Mechanisms of enhanced orbital dia- and paramagnetism: Application to the Rashba semiconductor BiTeI
G. A. H. Schober, H. Murakawa, M. S. Bahramy +4
We study the magnetic susceptibility of a layered semiconductor BiTeI with giant Rashba spin splitting both theoretically and experimentally to explore its orbital magnetism. Apart…
Imaging Oxygen Defects and their Motion at a Manganite Surface
Benjamin Bryant, Christoph Renner, Yusuke Tokunaga +2
Manganites are technologically important materials, used widely as solid oxide fuel cell cathodes: they have also been shown to exhibit electroresistance. Oxygen bulk diffusion and…
Emergent electromagnetism in solids
Naoto Nagaosa, Yoshinori Tokura
Electromagnetic field (EMF) is the most fundamental field in condensed-matter physics. Interaction between electrons, electron-ion interaction, and ion-ion interaction are all of t…
Impact of geometrical frustration on charge transport near the Mott transition in pyrochlore (YCd)MoO
S. Iguchi, Y. Kumano, K. Ueda +2
To search for novel spin-charge coupled phenomena in the strongly correlated electron system on a frustration lattice, charge transport and dynamics have been investigated for the…
Origin of the large polarization in multiferroic YMnO thin films revealed by soft and hard x-ray diffraction
H. Wadati, J. Okamoto, M. Garganourakis +9
We investigated the magnetic structure of an orthorhombic YMnO3 thin film by resonant soft x-ray and hard x-ray diffraction. We observed a temperature-dependent incommensurate magn…
Chirality of Matter Shows Up via Spin Excitations
Sandor Bordacs, Istvan Kezsmarki, David Szaller +10
Right- and left-handed circularly polarized light interact differently with electronic charges in chiral materials. This asymmetry generates the natural circular dichroism and gyro…
Common Origin of the Circular-dichroism Pattern in ARPES of SrTiO3 and CuxBi2Se3
Y. Ishida, H. Kanto, A. Kikkawa +15
Circular dichroism in the angular distribution (CDAD) of photoelectrons from SrTiO3:Nb and CuxBi2Se3 is investigated by 7-eV laser ARPES. In addition to the well-known node that oc…
Complex magnetism and magnetic field-driven electrical polarization in CoTeO
M. Hudl, R. Mathieu, S. A. Ivanov +8
The magnetic and electrical properties of CoTeO single-crystals with corundum related structure reveal a magnetic-field induced polarization below 21 K. A sharp peak in the…
Ferrimagnetism and spontaneous ordering of transition-metals in La2CrFeO6 double-perovskite films
S. Chakraverty, A. Ohtomo, D. Okuyama +8
We report on atomic ordering of B-site transition-metals and magnetic properties of epitaxial La2CrFeO6 double-perovskite films grown by pulsed-laser deposition under various condi…
Versatile helimagnetic phases under magnetic fields in cubic perovskite SrFeO3
S. Ishiwata, M. Tokunaga, Y. Kaneko +7
A helical spin texture is of great current interest for a host of novel spin-dependent transport phenomena. We report a rich variety of nontrivial, helimagnetic phases in the simpl…
Magnetically-Driven Ferroelectric Atomic Displacements in perovskite like YMnO3
D. Okuyama, S. Ishiwata, Y. Takahashi +9
Magnetically-driven ferroelectric atomic displacements of the order of 10_3$ by a single-crystal synchrotr…
Terahertz magnetoelectric response via electromagnons in magnetic oxides
N. Kida, Y. Tokura
Terahertz magnetic resonance driven by the light electric field, now referred to as electromagnon, has stimulated interest due to its strong candidate for future spin-electronics.…
Polar distortions in hydrogen bonded organic ferroelectrics
Alessandro Stroppa, Domenico Di Sante, Sachio Horiuchi +3
Although ferroelectric compounds containing hydrogen bonds were among the first to be discovered, organic ferroelectrics are relatively rare. The discovery of high polarization at…
Ferromagnetic Enhancement of CE-type Spin Ordering in (Pr,Ca)MnO
S. Y. Zhou, Y. Zhu, M. C. Langner +12
We present resonant soft X-ray scattering (RSXS) results from small band width manganites (Pr,Ca)MnO, which show that the CE-type spin ordering (SO) at the phase boundary is st…
Dynamical magnetoelectric effects in multiferroic oxides
Y. Tokura, N. Kida
Multiferroics with coexistent ferroelectric and magnetic orders can provide an interesting laboratory to test unprecedented magnetoelectric responses and their possible application…
Magnetic-field induced competition of two multiferroic orders in a triangular-lattice helimagnet MnI2
T. Kurumaji, S. Seki, S. Ishiwata +4
Magnetic and dielectric properties with varying magnitude and direction of magnetic field H have been investigated for a triangular lattice helimagnet MnI2. The in-plane electric p…
Gigantic terahertz magnetochromism via electromagnons in hexaferrite magnet BaMgFeO
N. Kida, S. Kumakura, S. Ishiwata +2
Effects of temperature (6--225 K) and magnetic field (0--7 T) on the low-energy (1.2--5 meV) electrodynamics of the electromagnon, the magnetic resonance driven by the light electr…