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Layered Cobaltites: Synthesis, Oxygen Nonstoichiometry, Transport and Magnetic Properties

100%
Conder K., Podlesnyak A., Pomjakushina E., Stingaciu M.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
7-14
EN
Complex cobalt oxide perovskite-derived compounds with a general formula LnBaCo_2O_{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
2
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Anharmonicity and Weak Mode Assignment in La_{2-x}Sr_xCuO_4, with Oxygen Isotopic Substitution

88%
Siranidi E., Lampakis D., Palles D., Liarokapis E., Conder K.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
173-177
EN
The oxygen isotope effect on the first- and second-order Raman active modes of high-quality La_{2-x}Sr_xCu^{16,18}O_4 (80% substitution ^{16}O by ^{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.
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