Open AccessTemperature dependence of Peierls–Hubbard phase transition in [Pd(cptn)2Br]Br2 studied by scanning tunneling microscopy
Author(s) -
Yuka Hosomi,
Shoji Yoshida,
Atsushi Taninaka,
Takefumi Yoshida,
Shinya Takaishi,
Osamu Takeuchi,
Masahiro Yamashita,
Hidemi Shigekawa
Publication year - 2016
Publication title -
japanese journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 129
eISSN - 1347-4065
pISSN - 0021-4922
DOI - 10.7567/jjap.55.08nb16
Subject(s) - condensed matter physics , scanning tunneling microscope , valence (chemistry) , charge density wave , quantum tunnelling , peierls transition , phase transition , charge ordering , chemistry , transition temperature , materials science , charge (physics) , superconductivity , physics , organic chemistry , quantum mechanics
The temperature dependence of the Peierls–Hubbard phase transition in [Pd(cptn)2Br]Br2 (cptn: 1R,2R-diaminocyclopentane) was directly observed using a low-temperature scanning tunneling microscope. A short ligand without alkyl chains was used to form a rigid crystal lattice to reduce the effect of structural changes in the crystal with temperature. The hysteresis in the temperature dependence of the ratio between the areas of the charge density wave (CDW) state produced by the PdII–PdIV mixed-valence state and the Mott–Hubbard (MH) state with a PdIII-averaged valence state which is a characteristic of the first-order phase transition, was directly observed at the atomic scale. Pinning of the CDW phase by defects was observed below the critical temperature, suggesting the growth of the CDW phase with defects as nuclei
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