Autor: Lemée-Cailleau, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the Crystal and Magnetic Behavior οf $ScFe_{4}Al_{8}$ Single Crystal
Autorzy:: Rećko, K.
Dobrzyński, L.
Lemée-Cailleau, M.
Waliszewski, J.
Talik, E.
Suski, W.
Courtois, P.
Powiązania:: https://bibliotekanauki.pl/articles/1810469.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.05.fm
61.05.cp
Opis:: Nuclear and magnetic properties of the $ScFe_{4}Al_{8}$ single crystal were found to exhibit unparalleled complexity of nuclear and magnetic structures. Our previous neutron measurements revealed presence of two modulation vectors, both along [ε, ε, 0], however with different critical temperatures. Recent experiments forced us to revise our knowledge of the structural ordering in the sample. So far, the crystal structure of this alloy, being of $ThMn_{12}$-type, has never been questioned.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 206-208
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Physics of Neutral-to-Ionic Phase Transition in Organic Charge Transfer Semiconducting Compounds
Autorzy:: Cailleau, H.
Lemée-Cailleau, M. H.
Le Cointe, M.
Luty, T.
Powiązania:: https://bibliotekanauki.pl/articles/1967953.pdf
Data publikacji:: 1997-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.38.+i
61.50.Ks
71.35.Aa
Opis:: An uncommon excitonic instability takes place in some exotic semiconducting compounds. Indeed, the equilibrium neutral-to-ionic (N-I) phase transition, as well as the non-equilibrium photo-induced phase transformation, observed in some organic charge-transfer complexes, originate from intra- and inter-chain cooperative effects between structurally relaxed charge-transfer excitations. This electronic-structural phase transition manifests itself by a change of the degree of charge-transfer and a dimerization distortion with the formation of donor-acceptor pairs along the stacking axis in the I phase. Thermal charge-transfer excitations associated with the formation of I strings along N chains are at the heart of the mechanism of this phase transition. These relaxed electronic excitations, which are an intrinsic feature of low-dimensional systems with strong electron-phonon coupling, can be described in terms of self-trapping and self-multiplication of charge-transfer excitons. Precise structural studies on the prototype compound, tetrathiafulvalene-p-chloranil allow to highlight the respective role taken by the ionicity and the dimerization. Symmetry and thermodynamics analysis of the N-I transition, based on recent determination of the pressure-temperature phase diagram, make possible to present a consistent picture of this phase transition. Supported by theoretical considerations taking into account the interplay between quantum and thermal effects, the experimental observations show that the N-I transition results from the condensation and the ordering (crystallization) of charge-transfer excitations, following a phase diagram analogous to the solid-liquid-gas one.
Źródło:: Acta Physica Polonica A; 1997, 92, 4; 597-608
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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