SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Charge Density Wave Materials

TT 17.3: Talk

Thursday, September 30, 2021, 10:30–10:45, H6

Electronic transformations in the semi-metallic transitional oxide Mo₈O₂₃ — Venera Nasretdinova¹, •Yaroslav Gerasimenko^2,3, Jernej Mravlje³, Gianmarco Gatti⁴, Petra Sutar³, Damjan Svetin³, Anton Meden⁵, Viktor Kabanov³, Alexander Kuntsevich^6,7, Marco Grioni⁴, and Dragan Mihailovic^1,3,5 — ¹CENN Nanocenter, Ljubljana, Slovenia — ²University of Regensburg, Germany — ³JSI, Ljubljana, Slovenia — ⁴EPFL, Lausanne, Switzerland — ⁵University of Ljubljana, Slovenia — ⁶LPI RAS, Moscow, Russia — ⁷HSE, 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 343K 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 [3].
[1] V. Nasretdinova et al. PRB 99, 085101
[2] V. Nasretdinova et al., Sci.Rep. 9, 15959 (2019)
[3] V. Nasretdinova et al., in preparation