Pressure study of structural properties and phonons in YBa2Cu3 O7 |
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Authors: | Claudia Ambrosch-Draxl Robert Kouba |
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Affiliation: | (1) Institut für Theoretische Physik, Universität Graz, Universitätsplatz 5, A-8010 Graz, Austria |
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Abstract: | The pressure dependence of crystal structure and vibrational properties of YBa
2
Cu
3
O
7
is investigated by first-principles calculations based on density functional theory. We have determined the optimized geometry for different unit cell volumes by relaxing the atoms to their force-free positions. The tendency of altered bond strength with pressure is consistent with experimental investigations and previous c-axis strain calculations. The pressure effect on the three A
1g
phonon frequencies dominated by oxygen vibrations is in very good agreement with experimental investigations showing constant linear pressure coefficients d /dp over a wide range of pressure values. |
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Keywords: | |
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