Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 23: Low-Dimensional Systems: Other Materials
TT 23.7: Talk
Monday, March 31, 2014, 18:15–18:30, BEY 81
Orbital contribution to spin-Peierls transition in TiPO4 — Dirk Wulferding1, Angela Moeller2, Kwang-Yong Choi3, Yurii Pashkevich4, Roman Babkin4, Karina Lamonova4, •Peter Lemmens1, Joseph Law5, Reinhardt Kremer6, and Robert Glaum7 — 1IPKM, TU-BS, Braunschweig, Germany — 2Dept. Chem., Univ., Houston, USA — 3Dept. Phys., CA Univ., Seoul, Korea — 4DonFTI, Donetsk, Ukraine — 5Dresden HMFL, Dresden, Germany — 6MPI-FKF, Stuttgart, Germany — 7IAC, Bonn, Germany
We observe unusual lattice dynamics as well as evidence for an orbital instability preceding the spin-Peierls transition in TiPO4. Furthermore, there exist high energy excitations of mixed electronic and lattice origin that suggest an exotic dimerization process, different from other spin-Peierls materials. Therefore, the energy gain is related to magnetoelastic and orbital contributions.