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HL: Fachverband Halbleiterphysik
HL 4: Complex Oxides: Bulk Properties (jointly with DS, HL, KFM, MA, O) (joint session TT/HL/MA)
HL 4.12: Vortrag
Montag, 16. März 2020, 12:30–12:45, HSZ 201
Electronic transformations in the semi-metallic transitional oxide Mo8O23 — •Venera Nasretdinova1, Yaroslav Gerasimenko1,2, Jernej Mravlje2, Gianmarco Gatti3, Petra Sutar2, Damjan Svetin1,2, Anton Meden4, Viktor Kabanov2, Alexander Kuntsevich5,6, Marco Grioni3, and Dragan Mihailovic1,2 — 1CENN Nanocenter, Ljubljana, Slovenia — 2JSI, Ljubljana, Slovenia — 3Institute of Physics, EPFL, Lausanne, Switzerland — 4University of Ljubljana, Slovenia — 5LPI of RAS, Moscow, Russia — 6HSE, Moscow, Russia
Mo8O23 is a low-dimensional stoichiometric transitional metal oxide from MoO3−x family. Its room-temperature phase associated with charge density wave (CDW) is accompanied by non-monotonic resistivity at low temperatures well below structural transitions. Using tunneling and angle-resolved spectroscopy, transport measurements and density functional calculations we reveal electronic transformations leading to a multi-band correlated ground state [1, 2]. We observe the metal-to-insulator transition at 343 K in resistivity, consistent with CDW onset. At low temperatures, the picture with the only CDW order parameter is broken by the onset of the correlated ground state visible both in transport and spectroscopic probes. Spatially-resolved tunneling spectroscopy studies reveal the emergent electronic texture. We discuss the possible origins of the electronic order that emerge in the absence of any structural or magnetic transitions.
[1] V. Nasretdinova et al., Phys.Rev. B 99, 085101 (2019)
[2] V. Nasretdinova et al., Sci. Rep. 9, 15959 (2019)