arXiv subjects

M. Maksimuk

Publications and source records attributed to M. Maksimuk.

2 recordsLinked to original sources

arXiv2003

Influence of the cooling rate on low-temperature Raman and infrared reflection spectra of partially deuterated k-(BEDT-TTF)_2Cu[N(CN)_2]Br

Raman and IR spectra of k-(BEDT-TTF)_2Cu[N(CN)_2]Br [BEDT-TTF denotes bis(ethylenedithiolo)tetrathiafulvalene] and its deuterated and partially deuterated analogues were measured at temperatures between 5 and 300 K and cooling rates from 1 to 20 K/min. It was found that, in partially deuterated samples, the interdimer electron-molecular vibration splitting of nu_3 mode in Raman spectra, the magnitude of the resonance enhancement in Raman spectra, and linewidths of some phonon peaks both in Raman and infrared spectra depend on the cooling rate. These observations were explained by disorder-related effects.

cond-mat.supr-con↗

arXiv2001

The C=C Stretching Vibrations of k-(BEDT-TTF)_2Cu[N(CN)_2]Br and Its Isotope Analogues

The C=C stretching modes in resonance Raman spectra and infrared reflectivity were measured at temperatures between 15 K and 300 K using various polarizations in k-(BEDT-TTF)_2Cu[N(CN)_2]Br, its fully and partially deuterated analogues, and ^{13}C-substituted analogue. The infrared- and Raman-active bands were re-assigned based on the factor group analysis. We found a Raman-active EMV-coupled ν_3 mode near 1420 cm_{-1}, which shows a large downshift and broadening through the inter-dimer EMV interaction. The mixing of the bridge and ring C=C stretching vibrations depends upon the symmetry of the crystal mode. In contrast to deuterated crystals, the non-deuterated crystals show a splitting in the ν_2, ν_3, and ν_{27} bands.

cond-mat.supr-con↗