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Anharmonicity and Weak Mode Assignment in La_{2-x}Sr_xCuO_4, with Oxygen Isotopic Substitution

100%

Siranidi E., Lampakis D., Palles D., Liarokapis E., Conder K.

Acta Physica Polonica A

2007

vol. 111

issue 1

173-177

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.

Raman Study in Pr_{0.5}Ca_{0.5}MnO_3 Thin Films

86%

Tatsi A., Papadopoulou E., Lampakis D., Liarokapis E., Prellier W., Mercey B.

Acta Physica Polonica A

2004

vol. 105

issue 1-2

99-106

We report novel Raman measurements made on Pr_{0.5}Ca_{0.5}MnO_3 thin films grown on SrTiO_3 and LaAlO_3 (PCMO/STO and PCMO/LAO, respectively). The measurements were performed for a temperature range 78 K

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2 Acta Physica Polonica A

1 2007

1 2004

2 Lampakis D.

2 Liarokapis E.

1 Conder K.

1 Mercey B.

1 Palles D.

1 Papadopoulou E.

1 Prellier W.

1 Siranidi E.

1 Tatsi A.

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Anharmonicity and Weak Mode Assignment in La_{2-x}Sr_xCuO_4, with Oxygen Isotopic Substitution

Raman Study in Pr_{0.5}Ca_{0.5}MnO_3 Thin Films