Mott insulator-to-metal transition in yttrium-doped CaIrO₃.

@article{Gunasekera2015MottIT,
  title={Mott insulator-to-metal transition in yttrium-doped CaIrO₃.},
  author={Jagath Gunasekera and Y. Chen and Jesse Kremenak and P F Miceli and Dheeraj Kumar Singh},
  journal={Journal of physics. Condensed matter : an Institute of Physics journal},
  year={2015},
  volume={27 5},
  pages={
          052201
        }
}
We report on the study of insulator-to-metal transition in post-perovskite compound CaIrO3. It is discovered that a gradual chemical substitution of calcium by yttrium leads to the onset of strong metallic behavior in this compound. This observation is in stark contrast to BaIrO3, which preserves its Mott insulating behavior despite excess of the charge carriers due to yttrium doping. Magnetic measurements reveal that both compounds tend to exhibit magnetic character irrespective of the… 

Figures and Tables from this paper

Magnetic fluctuations driven insulator-to-metal transition in Ca(Ir1−xRux)O3
TLDR
The discovery of a compelling link between magnetic fluctuations and the insulator-to-metal transition in Ca(Ir1−xRux)O3 perovskites as a function of the substitution coefficient x is reported.
Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates
Perovskite iridates have emerged as a new paradigm for studying the strongly correlated electron physics with strong spin-orbit coupling. The “113” alkaline-earth iridates AIrO3 (A = Ca, Sr, Ba)
Resonant inelastic X-ray scattering on spin-orbit-induced correlated-electron systems : scientific applications and instrumental developments
Iridium oxides (iridates) have raised notable attention in the last decade due to the identification of a Mott insulating state realized by the joint action of crystal field, electron correlation,
Block excitonic condensate at n=3.5 in a spin-orbit coupled t2g multiorbital Hubbard model
Theoretical studies recently predicted the condensation of spin-orbit excitons at momentum $q$=$\pi$ in $t_{2g}^4$ spin-orbit coupled three-orbital Hubbard models at electronic density $n=4$. In
A $$\hbox {j}_{\mathrm{eff}} = 1/2$$ pseudospinon continuum in $$\hbox {CaIrO}_{{3}}$$
In so-called $j_\mathrm{eff} = 1/2$ systems, including some iridates and ruthenates, the coherent superposition of $t_\mathrm{2g}$ orbitals in the ground state gives rise to hopping processes that
Nonconventional magnetic phenomena in neodymium thin film
Neodymium is a remarkable active component in numerous magnetic alloys that are used in various applications. However, the application of bare neodymium thin film is limited due to the lack of
Pseudospinon Continuum in CaIrO
  • 2020

References

SHOWING 1-10 OF 27 REFERENCES
High-temperature weak ferromagnetism on the verge of a metallic state: Impact of dilute Sr doping on BaIrO3
The 5d-electron based BaIrO3 is a nonmetallic weak ferromagnet with a Curie temperature at Tc=175 K. Its largely extended orbitals generate strong electron-lattice coupling, and magnetism and
Glassy ferromagnetism and magnetic phase separation in La1-xSrxCoO3
We present the results of a comprehensive investigation of the dc magnetization, ac susceptibility, and magnetotransport properties of the glassy ferromagnet La 1 - x Sr x CoO 3 . The compositions
CaIrO3: a spin-orbit Mott insulator beyond the j(eff) ground state.
TLDR
It is concluded that insulating CaIrO3 is not a j(eff) = 1/2 iridate and the consequences of this finding to the interpretation of previous experiments are discussed, as well as how the Mott insulating state in iridates can be readily extended beyond the j(EFF) =1/2 ground state.
Origin of charge density wave formation in insulators from a high resolution photoemission study of BaIrO3.
TLDR
The energy dependence of the spectral density of states reveals the importance of magnetic interactions, rather than well-known Coulomb repulsion effect, in determining the electronic structure thereby implying a close relationship between ferromagnetism and CDW observed in this compound.
Doping a Mott insulator: Physics of high-temperature superconductivity
This article reviews the physics of high-temperature superconductors from the point of view of the doping of a Mott insulator. The basic electronic structure of cuprates is reviewed, emphasizing the
Orbital magnetism and spin-orbit effects in the electronic structure of BaIrO3.
TLDR
The electronic structure and magnetism of Ir 5d5 states in nonmetallic, weakly ferromagnetic BaIrO3 are probed with x-ray absorption techniques and the unusual, atomiclike nature of the 5d moment is driven by a strong spin-orbit interaction in heavy Ir ions.
Effective J=1/2 insulating state in Ruddlesden-Popper iridates: an LDA+DMFT study.
TLDR
It is demonstrated that the deviation from the ideal Jeff=1/2 state is negligible at short time scales for both single- and double-layer iridates, while it becomes quite significant for Sr3Ir2O7 at long times and low energy.
Post-Perovskite Phase Transition in MgSiO3
TLDR
Results demonstrate that MgSiO3 perovskite transforms to a new high-pressure form with stacked SiO6-octahedral sheet structure above 125 gigapascals and 2500 kelvin (2700-kilometer depth near the base of the mantle) with an increase in density of 1.0 to 1.2%.
Resonant x-ray diffraction study of the strongly spin-orbit-coupled mott insulator CaIrO3.
TLDR
It is proposed that nonmagnetic resonant scattering is a powerful tool for unraveling an orbital state even in a metallic iridate, points to the universal importance of the spin-orbit coupling in Ir oxides, independent of the octahedral connectivity and lattice topology.
...
1
2
3
...