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RESEARCH PRODUCT
Emergence of a metallic metastable phase induced by electrical current in Ca2RuO4
Carla CirilloAntonio VecchioneAdolfo AvellaG. AvalloneVeronica GranataCarmine AttanasioRosalba Fittipaldisubject
Materials scienceStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsMott insulatorFOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencescrystalCrystalCondensed Matter - Strongly Correlated ElectronsTetragonal crystal systemMott; crystalElectrical resistivity and conductivityCondensed Matter::SuperconductivityPhase (matter)Metastability0103 physical sciencesCondensed Matter::Strongly Correlated ElectronsOrthorhombic crystal system010306 general physics0210 nano-technologyMottEnergy (signal processing)description
A comprehensive study of the behavior of the Mott insulator ${\mathrm{Ca}}_{2}{\mathrm{RuO}}_{4}$ under electrical current drive is performed by combining two experimental probes: the macroscopic electrical transport and the microscopic x-ray diffraction. The resistivity, $\ensuremath{\rho}$, versus electric current density, $J$, and temperature, $T,\ensuremath{\rho}(J,T)$, resistivity map is drawn. In particular, the metastable state, induced between the insulating and the metallic thermodynamic states by current biasing ${\mathrm{Ca}}_{2}{\mathrm{RuO}}_{4}$ single crystals, is investigated. Such an analysis, combined with the study of the resulting ${\mathrm{RuO}}_{6}$ octahedra energy levels, reveals that a metallic crystal phase emerges in the metastable regime. The peculiar properties of such a phase, coexisting with the well-established orthorhombic insulating and tetragonal metallic phases, allow one to explain some of the unconventional and puzzling behaviors observed in the experiments as a negative differential resistivity.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-12-03 | Physical Review B |