TY - JOUR
T1 - Temperature- and pressure-induced charge-density-wave to Mott-Hubbard phase transitions in quasi-one-dimensional bromine-bridged Pd compounds
AU - Matsuzaki, Hiroyuki
AU - Takaishi, Shinya
AU - Takamura, Mitsuhito
AU - Kumagai, Shohei
AU - Yamashita, Masahiro
AU - Okamoto, Hiroshi
PY - 2012/7
Y1 - 2012/7
N2 - Temperature- and pressure-induced transitions from the charge-density-wave (CDW) phase to the Mott-Hubbard (MH) phase in the quasi-one-dimensional Br-bridged Pd compound, [Pd(en) 2Br](Cn-Y) 2·H 2O (n = 4-9, and 12) (en: ethylenediamine, C n-Y: dialkyl-sulfosuccinate), were investigated by means of crystal-structure analyses and Raman spectroscopy. From the systematic evaluations of the bridging-bromine displacements δ reflecting the CDW amplitudes, the distance L between the neighboring two Pd ions, and the Raman frequency ωS of the symmetric Pd-Br stretching mode, we demonstrated that ωS is a good measure of the CDW amplitude. By scrutinizing the variations of ωS in the pressure-induced and the temperature-induced CDW-to-MH transitions, we discuss the nature of the CDW to- MH transitions in this category of materials.
AB - Temperature- and pressure-induced transitions from the charge-density-wave (CDW) phase to the Mott-Hubbard (MH) phase in the quasi-one-dimensional Br-bridged Pd compound, [Pd(en) 2Br](Cn-Y) 2·H 2O (n = 4-9, and 12) (en: ethylenediamine, C n-Y: dialkyl-sulfosuccinate), were investigated by means of crystal-structure analyses and Raman spectroscopy. From the systematic evaluations of the bridging-bromine displacements δ reflecting the CDW amplitudes, the distance L between the neighboring two Pd ions, and the Raman frequency ωS of the symmetric Pd-Br stretching mode, we demonstrated that ωS is a good measure of the CDW amplitude. By scrutinizing the variations of ωS in the pressure-induced and the temperature-induced CDW-to-MH transitions, we discuss the nature of the CDW to- MH transitions in this category of materials.
KW - Charge density wave
KW - Extended Peierls-Hubbard model
KW - Mott-Hubbard phase
KW - Phase transition
KW - Raman spectroscopy
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U2 - 10.1143/JPSJ.81.074705
DO - 10.1143/JPSJ.81.074705
M3 - Article
AN - SCOPUS:84863574532
SN - 0031-9015
VL - 81
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 7
M1 - 074705
ER -