Pressure Dependence of Acoustic Modes in AgGaSe 2
| Autor: | J. Ażewski, Patrick Derollez, Bernard Hennion, Markus Braden, R. Fouret, Stefan Klotz, J. González |
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| Rok vydání: | 2002 |
| Předmět: |
Phase transition
Materials science Condensed matter physics Phonon business.industry Condensed Matter Physics Inelastic neutron scattering Brillouin zone Condensed Matter::Materials Science Transverse plane Semiconductor Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Wave vector business Softening |
| Zdroj: | High Pressure Research. 22:283-286 |
| ISSN: | 1477-2299 0895-7959 |
| DOI: | 10.1080/08957950212782 |
| Popis: | The pressure dependence of the transverse acoustic TA[0 0 1] and TA[1 0 0] phonons and the low-frequency optical v 3 phonons of AgGaSe 2 has been measured at pressures up to 4.3 GPa by inelastic neutron scattering. The strong frequency decreases in the whole Brillouin zone of the TA modes show generally a weak nonlinearity. Depending on the wavevector, the softening prior to the phase transition at 2.6 GPa also affects the optical mode to a less extent. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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