Journal ArticleDOI
Three-Dimensional Antiferromagnetic Order and Anisotropic Magnetic Properties in Bi 2 CuO 4
Kazuyoshi Yamada,Ken-ichi Takada,Syoichi Hosoya,Yousuke Watanabe,Yasuo Endoh,Norihisa Tomonaga,Takashi Suzuki,Toru Ishigaki,Takashi Kamiyama,Hajime Asano,Fujio Izumi +10 more
TLDR
In this article, the structure and magnetic properties of Bi 2 CuO 4 have been studied by neutron and X-ray diffraction, magnetic susceptibility and magnetization measurements, and three-dimensional (3D) and anisotropic antiferromagnetism is revealed for this compound rather than the previously anticipated one dimensional one.Abstract:
The structure and magnetic properties of Bi 2 CuO 4 have been studied by neutron and X-ray diffraction, magnetic susceptibility and magnetization measurements. Three-dimensional (3D) and anisotropic antiferromagnetism is revealed for this compound rather than the previously anticipated one-dimensional one. Long-range antiferromagnetic order associated with a ferromagnetic stacking of Cu 2+ spins along the [001] axis starts to develop below T N =42 K. A magnetic moment of 0.85±0.05 µ B /Cu which is larger than those of Cu 2+ spins in the two-dimensional Heisenberg antiferromagnets such as La 2 CuO 4 and Sr 2 CuCl 2 O 2 reflects the 3D character in Bi 2 CuO 4 . A non-linear magnetization curve under an inplane magnetic field is analyzed quantitatively by a continuous spin rotation in the (001) plane.read more
Citations
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The crystal chemistry of AM2O4 oxometallates
TL;DR: In this paper, the crystal chemistry of oxometallates with composition AM2O4 was summarized, which indicates that more than 50 individual structure types regarding the formulae AM 2O4 or A2MO4 exist, including spinels, spineloids, compounds with closed and interrupted octahedra layers, tunnel structures, as well as square-planar polygons and dumbbells.
Journal ArticleDOI
EPR and AFMR of Bi2CuO4 in Submillimeter Wave Region
Hitoshi Ohta,Kazuhiro Yoshida,Takashi Matsuya,Takao Nanba,Mitsuhiro Motokawa,Kazuyoshi Yamada,Yasuo Endoh,Shoichi Hosoya +7 more
TL;DR: In this article, a paramagnetic and antiferromagnetic resonance was observed for powder samples of Li 2 CuO 2 in submillimeter wave region using pulsed magnetic fields at temperatures from 1.9 K to 265 K.
Journal ArticleDOI
Thermodynamic Evaluation of the Bi-Cu-O System
TL;DR: In this article, a thermodynamic evaluation of the ternary Bi-Cu-O system has been made and a set of parameters consistently describing the system at 1 bar total pressure has been determined.
Journal ArticleDOI
CuBi2O4: Electronic Structure, Optical Properties, and Photoelectrochemical Performance Limitations of the Photocathode
Jason K. Cooper,Zemin Zhang,Zemin Zhang,Subhayan Roychoudhury,Subhayan Roychoudhury,Chang-Ming Jiang,Sheraz Gul,Yi-Sheng Liu,Rohan Dhall,Alejandro Ceballos,Junko Yano,David Prendergast,Sebastian E. Reyes-Lillo +12 more
TL;DR: In this article, the uniqueness and commonalities of p-type semiconductors for photocathode in photoelectrochemical (PEC) solar fuel production are discussed and discussed.
Journal ArticleDOI
TiOCl, TiOBr-are these RVB d1, S=1/2 materials? The results of scandium substitution set in the context of other S=1/2 systems of current interest for high-temperature superconductivity and the metal-insulator transition
Robert J. Beynon,J A Wilson +1 more
TL;DR: In this paper, the authors studied the magnetic properties of Sc-doped TiOX, seeking possible indications of the existence of the resonant valence bond or RVB state-the state currently suggested by some to be responsible for high-temperature superconductivity in the mixed-valence cuprates.
References
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Rietveld analysis of powder patterns obtained by TOF neutron-diffraction using cold neutron sources
TL;DR: In this paper, a profile shape function is implemented which is optimized for a solid-methane moderator at 20'K and the results of Rietveld refinements of Si and α-Al2O3 show that the profile shape functions fit neutron diffraction patterns taken on the HRP very well, and that very precise crystal-structure parameters can be obtained with this program.
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Antiferromagnetism in Sr2CuO2Cl2.
TL;DR: The magnetic-susceptibility \ensuremath{\chi}(T) near ${T}_{N}$ is consistent with the tetragonal structure, showing no evidence for the peak at £N seen in orthorhombic ${\mathrm{La}}_{2}$${CuO}}_{4}$, arising from the Dzyaloshinsky-Moriya interaction, which is absent without the orthorHombic distortion.
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Long-range antiferromagnetic ordering in Bi2CuO4.
TL;DR: Simultaneous refinement of the room-temperature x-ray and neutron-diffraction data was used to obtain accurate cell parameters and atomic positions, and ESR signals can be associated with antiferromagnetic resonance modes, consistent with an ordered antiferromeagnetic phase.
Journal ArticleDOI
Über Oxocuprate. XIII. Isolierte quadratisch planare CuO46−‐Polyeder in CuBi2O4, ein neuer Bautyp zur Formel Me23+M2+O4
R. Arpe,Hk. Müller-Buschbaum +1 more
TL;DR: In this article, a new type of crystal structure with the general formula Mc23+M2+O4 (Bi2CuO4) was presented and investigated by single crystal X-ray methods.
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Vibrational properties of Bi2CuO4.
TL;DR: In this paper, both polarized Raman and unpolarized infrared-reflectivity spectra of the isostructural compound (PdO) were reported and the assignment of the observed Raman modes was given according to Cartesian symmetry coordinates and preliminary force-constant calculation on the basis of a rigid-ion model.