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Phonon frequencies at the Γ, X , M , and R points of the Brillouin zone (BZ) in the cubic phase of Ba(Ti,Zr,Hf)O 3 were calculated by the frozen phonon method using density functional theory with the hybrid exchange correlation functional PBE0. The calculations use linear combination of atomic...
We develop a general theory of the spin dynamics of Heisenberg antiferromagnetic rings (HAFRs) that explains the mechanism of NMR spin-lattice relaxation at low temperatures. In HAFRs, the imaginary parts of the q -summed dynamic spin susceptibilities parallel and perpendicular to an applied...
Phase-pure, fully epitaxial Sr 2 FeMoO 6 films with a high degree of Fe/Mo ordering have been fabricated using ultrahigh vacuum sputtering and verified by a variety of techniques. Through identifying and controlling critical factors, such as stoichiometry, phase purity, and double-perovskite...
We study the magnetic phase diagram of spin- 3 2 fermions in a spatially anisotropic square optical lattice at quarter filling (corresponding to one particle per lattice site). In the limit of the large on-site repulsion the system can be mapped to the so-called Sp ( N ) Heisenberg spin model...
We study negative refraction and focusing of elastic waves in a simple mechanical system comprised of a freestanding plate with a step change in thickness. A point-focused and intensity-modulated laser source is used to excite backward-propagating Lamb waves on one side of the step, and the...
The discovery of ferroelectrics induced by peculiar magnetic structures brought about extensive theoretical and experimental studies. The key driving force for these magnetic ferroelectrics appears to lie in the inverse Dzyaloshinskii-Moriya (DM) interaction in magnets with long-wavelength...
We have examined the stability of the ferromagnetic (FM) state in CaRuO 3 and SrRuO 3 as a function of the GdFeO 3 distortion. Model calculations predict the dependence of the FM transition temperature ( T c ) on the rotation angle θ to vary as cos 2 ( 2 θ ) for e g -electron systems. However,...
The molar volume ( V m ) scaled flow activation energy (Δ E ), namely as the activation energy density ρ E = Δ E / V m , is proposed to describe the flow of metallic glasses. Based on the energy landscape, both the shear and bulk moduli are critical parameters accounting for the ρ E of both...
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