Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-18
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 3 figures, presented at ISS2005, to appear in Physica C
Scientific paper
10.1016/j.physc.2006.03.100
We report infrared reflectivity spectra for a new correlated cupric oxide system Sr2Cu(Re0.69Ca0.31)Oy with y ~ 0.6 at several temperatures ranging between 8 and 380 K. The reflectivity spectrum at 300 K comprises of several optical phonons. A couple of residual bands located around 315 and 653 cm-1 exhibit exceptionally large intensity as compared to the other ones. The overall reflectivity spectrum lifts up slightly with increasing temperature. The energy and damping factor of transverse-optical phonons are determined by fitting the imaginary dielectric constant by Lorentz oscillator model and discussed as a function of temperature in terms of lattice anharmonicity.
Ahmad Junaid Jameel
Alam Saad S.
Isobe Masaharu
Shizuya M.
Uwe Hiromoto
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