2023年1月30日 · Every molecule has a point group associated with it, which are assigned by a set for rules (explained by Group theory). The character tables takes the point group and represents all of the symmetry …

2020年7月16日 · Critical fluctuations of the excitonic order parameter give rise to quasi-elastic scattering of B2g symmetry, whose intensity grows inversely with temperature toward the Weiss temperature of Tw ~241 K, which is arrested by a structural phase transition driven by an acoustic phonon of the same symmetry at Tc =325 K. Concurrently, a B2g optical ...

Raman response function for B2g and B1g symmetry channels (1.9 eV excitation) at temperatures between 35 and 320 K. Sketches for the Fermi surface are based on ARPES data [4,5,11]. Regions...

Symmetry species of translations, rotations, and vibrations can be determined by considering the character of the representation spanned by Cartesian vectors localized on each atom. For example, consider the PtCl42-ion of Figure 5.2, with the z axis assumed to emerge from the plane of the page for each atom.

Fig. 2 we show Raman susceptibility χ (ω) at representative temperatures and dopings for the A 1g , B 2g , and B 1g symmetry channels to point out important features in relation to the ...

1993年3月15日 · Nuclear site symmetry analysis predicts six Raman-active bands. Five peaks are consistently observed, whereas the sixth remains controversial. Also, two different sets of irreducible representations are reported: 2A 1g + 3E g + B 2g (or B 1g ) + 3A 2u + 3E u .

2021年12月24日 · We present a comprehensive study of temperature-dependent polarized Raman scattering in a nearly stoichiometric orthorhombic YTiO3 single crystal. The lattice-dynamics calculations authenticate the assignment for the observed Ag- and B2g-symmetry modes in terms of the atoms vibrational patterns.

2015年4月20日 · We use the symmetry constrained low energy effective Hamiltonian of iron based superconductors to study the Raman scattering in the normal state of underdoped iron-based superconductors. The incoming and scattered Raman photons couple directly to orbital fluctuations and indirectly to the spin fluctuations.

ken mirror symmetry to B1g, B2g, and A2g. Building on this symmetry analysis, we propose a general Ginzburg-Landau theory and connect the various nematic orders with the under-lying incommensurate magnetic fluctuations. This allows for a unified understanding for the nematicity in FeSCs. In partic-

1989年5月1日 · We report the first Raman scattering measurement of the rutile structure compound IrO 2. The four allowed first-order Raman active phonon modes have been observed and classified. The spectrum exhibits strong lines of A 1g and E g symmetries, a slightly broadened line of B 2g symmetry, and a very weak sharp low-frequency B 1g mode.