Autor: Conder, K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Layered Cobaltites: Synthesis, Oxygen Nonstoichiometry, Transport and Magnetic Properties
Autorzy:: Conder, K.
Podlesnyak, A.
Pomjakushina, E.
Stingaciu, M.
Powiązania:: https://bibliotekanauki.pl/articles/2047176.pdf
Data publikacji:: 2007-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.80.Ga
71.27.+a
75.47.De
61.12.Ld
71.70.Ej
Opis:: Complex cobalt oxide perovskite-derived compounds with a general formula LnBaCo$\text{}_{2}$O$\text{}_{5+x}$ (Ln = rare earth) attracted considerable interests because of their interesting properties: magnetic and metal-insulator transitions, giant magnetoresistance, ionic conductivity, and a structural similarity to high temperature superconductors. All the compounds are oxygen non-stoichiometric (0
Źródło:: Acta Physica Polonica A; 2007, 111, 1; 7-14
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Anharmonicity and Weak Mode Assignment in La$\text{}_{2-x}$Sr$\text{}_{x}$CuO$\text{}_{4}$, with Oxygen Isotopic Substitution
Autorzy:: Siranidi, E.
Lampakis, D.
Palles, D.
Liarokapis, E.
Conder, K.
Powiązania:: https://bibliotekanauki.pl/articles/2047249.pdf
Data publikacji:: 2007-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.30.-j
31.30.Gs
74.25.Kc
74.72.Dn
Opis:: The oxygen isotope effect on the first- and second-order Raman active modes of high-quality La$\text{}_{2-x}$Sr$\text{}_{x}$Cu$\text{}^{16,18}$O$\text{}_{4}$ (80% substitution $\text{}^{16}$O by $\text{}^{18}$O) polycrystalline compounds with x=0.00, 0.015 was investigated at low temperatures. In the second-order Raman scattering several weak and strong peaks were observed and assigned to oxygen atom vibrations. With the isotopic substitution the apex oxygen mode follows quite well the mass harmonic law at all temperatures studied, while the soft mode is anharmonic in the temperature range of 77-180 K and for higher temperatures its anharmonicity is strongly increased. The temperature dependence of the energy of the soft mode for x=0.0 shows also a modification at≈180 K and an abnormal behaviour at≈280 K, which may be related with the transition to the antiferromagnetic phase.
Źródło:: Acta Physica Polonica A; 2007, 111, 1; 173-177
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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