Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 5: Niedrigdimensionale Systeme, Magnetotransport I

TT 5.3: Talk

Monday, March 11, 2002, 15:15–15:30, H20

Phonons and magnon-phonon interaction of high-pressure (VO)₂P₂O₇ studied by Raman scattering — •U. Kuhlmann¹, A. Gößling¹, C. Thomsen¹, A.V. Prokofiev², F. Büllesfeld², E. Uhrig², M. Anton², C. Gross², and W. Assmus² — ¹Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin — ²Physikalisches Institut, Universität Frankfurt, D-60054 Frankfurt

We present Raman spectra of the high pressure (HP) phase of (VO)₂P₂O₇ and compare with the results of the ambient pressure (AP) phase. Several phonons in the HP-phase revealed Fano line shapes at low temperatures indicating an interaction with a temperature dependend continuum. We assign these line shapes to an interaction with the two-magnon continuum of the antiferromagnetic spin chains and discuss the origin of the temperature dependence on basis of spin-phonon coupling.