Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 56: Poster Session: Low-Dimensional Systems
TT 56.3: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P2-OG4
Charge and orbital order in 1T-TaS2 — •Florian Heinsch1,2, Helmuth Berger3, Bernd Büchner4, Thomas Cowan1, Michal Dušek5, Tobias Förster1, Joachim Wosnitza1, Klaus Koepernik4, Václav Petříček5, Tobias Ritschel2, Marc Uhlarz1, and Jochen Geck2 — 1HZDR — 2TU Dresden — 3EPFL — 4IFW Dresden — 5Institute of Physics, Prague
Recently discovered phenomena in thin films of 1T-TaS2, like a laser induced ultra-fast switching to a hidden quantum states, offer great potential for future applications and prove that one has not yet unraveled the microscopic interactions behind the origin of the electronic order in this system completely [1].
One piece of the puzzle seems to be an orbital texture that is intertwined with the CDW in the commensurate state [2]. We investigated the incommensurate structural modulations of 1T-TaS2, which occur above T=350K, by means of single crystal X-ray diffraction and refined the crystal structure in the formalism of a (3+2)-dimensional superspace. Based on these information, we performed DFT calculations for repeating clusters. The obtained highest occupied molecular orbitals imply an orbital ordering. Since those degrees of freedom are expected to affect the magnetic susceptibility as well, we also started to reinvestigate the magnetic field dependence of the CDW-instability in 1T-TaS2. For the future we aim on time-resolved diffration experiments in high magnetic fields to gain insights into microscopical interactions.
[1] L. Stojchevska et al., Science 344.6180 (2014), pp. 177-180
[2] T. Ritschel et al., Nature Physics 11.4 (2015), pp. 328-331