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MA: Fachverband Magnetismus

MA 3: Complex Oxides: Bulk Properties (jointly with DS, HL, KFM, MA, O) (joint session TT/HL/MA)

MA 3.12: Vortrag

Montag, 16. März 2020, 12:30–12:45, HSZ 201

Electronic transformations in the semi-metallic transitional oxide Mo₈O₂₃ — •Venera Nasretdinova¹, Yaroslav Gerasimenko^1,2, Jernej Mravlje², Gianmarco Gatti³, Petra Sutar², Damjan Svetin^1,2, Anton Meden⁴, Viktor Kabanov², Alexander Kuntsevich^5,6, Marco Grioni³, and Dragan Mihailovic^1,2 — 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 MoO_3−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)