Pitfalls and solutions for perovskite transparent conductors

Si, Liang; Kaufmann, Josef; Zhong, Zhicheng; Tomczak, Jan M.; Held, Karsten

doi:10.1103/physrevb.104.l041112

Cited by 5 publications

(8 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous theoretical work, [ 29 ] we have shown that ultrathin 1 and 2 uc‐thick SRO 3 films are antiferromagnetic insulator due to the interplay between quantum confinement and correlations. This corresponds to the first case but with the less thickness according to our definition.…”

Section: Resultsmentioning

confidence: 99%

“…[18][19][20][21][22][23][24][25][26] SRO grown on STO substrates often displays the well-known MIT when the thickness decreases to a few (usually no more than four) unit cells (uc), which transforms to Mott insulator with a small bandgap. [27][28][29] Efforts in getting rid of such an either insulating or nonferromagnetic dead layer are highly challenging, which is dependent on the elegant growth control of stoichiometry of SRO, usually turning out the debated experimental results. [30][31][32][33] In recent experiments, the giant photoresponse has been observed in LaAlO 3 /STO interface via inserting a monolayer Mott SRO.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Light‐Induced Mott‐Insulator‐to‐Metal Phase Transition in Ultrathin Intermediate‐Spin Ferromagnetic Perovskite Ruthenates

Liu

Niu

et al. 2023

Advanced Materials

Self Cite

View full text Add to dashboard Cite

Light control of emergent quantum phenomena is a widely used external stimulus for quantum materials. Generally, perovskite strontium ruthenate SrRuO3 has an itinerant ferromagnetism with a low‐spin state. However, the phase of intermediate‐spin (IS) ferromagnetic metallic state has never been seen. Here, by means of UV‐light irradiation, a photocarrier‐doping‐induced Mott‐insulator‐to‐metal phase transition is shown in a few atomic layers of perovskite IS ferromagnetic SrRuO3−δ. This new metastable IS metallic phase can be reversibly regulated due to the convenient photocharge transfer from SrTiO3 substrates to SrRuO3−δ ultrathin films. These dynamical mean‐field theory calculations further verify such photoinduced electronic phase transformation, owing to oxygen vacancies and orbital reconstruction. The optical manipulation of charge‐transfer finesse is an alternative pathway toward discovering novel metastable phases in strongly correlated systems and facilitates potential light‐controlled device applications in optoelectronics and spintronics.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light‐Induced Mott‐Insulator‐to‐Metal Phase Transition in Ultrathin Intermediate‐Spin Ferromagnetic Perovskite Ruthenates

Liu

Niu

et al. 2023

Advanced Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…To investigate this impact, we use the prototypical correlated metal SrVO 3 (SVO), [22][23][24][25][26][27][28][29][30][31] a material which is attractive as highly conductive bottom electrode and transparent conductor [32][33][34] as well as a promising channel material for the realization of a Mott transistor. [35] We show that an overoxidized surface is inevitably present after the growth and persists in ultrahigh vacuum.…”

Section: Introductionmentioning

confidence: 99%

“…To investigate this impact, we use the prototypical correlated metal SrVO 3 (SVO), [22,23,24,24,25,26,27,28,29,30,31] a material which is attractive as highly conductive bottom electrode and transparent conductor [32,33,34] as well as a promising channel material for the realization of a Mott transistor [35]. By means of in situ photoelectron spectroscopy combined with realistic electronic structure calculations we demonstrate that the overoxidized surface, which forms inevitably under the growth conditions and persists in ultrahigh vacuum, severely affects the electronic and atomic structures of the ultrathin TMO film.…”

mentioning

confidence: 99%

Toward Functionalized Ultrathin Oxide Films: The Impact of Surface Apical Oxygen

Gabel

Pickem

Scheiderer

et al. 2021

Adv Elect Materials

Self Cite

View full text Add to dashboard Cite

Thin films of transition metal oxides open up a gateway to nanoscale electronic devices beyond silicon characterized by novel electronic functionalities. While such films are commonly prepared in an oxygen atmosphere, they are typically considered to be ideally terminated with the stoichiometric composition. Using the prototypical correlated metal SrVO3 as an example, it is demonstrated that this idealized description overlooks an essential ingredient: oxygen adsorbing at the surface apical sites. The oxygen adatoms, which are present even if the films are kept in an ultrahigh vacuum environment and not explicitly exposed to air, are shown to severely affect the intrinsic electronic structure of a transition metal oxide film. Their presence leads to the formation of an electronically dead surface layer but also alters the band filling and the electron correlations in the thin films. These findings highlight that it is important to take into account surface apical oxygen or—mutatis mutandis—the specific oxygen configuration imposed by a capping layer to predict the behavior of ultrathin films of transition metal oxides near the single unit‐cell limit.

show abstract

“…The increased distance to the oxygen orbitals then makes the single-d x 2 −y 2 -orbital description more suitable than for the CuO 2 layers in cuprates. However, densityfunctional theory (DFT) calculations [30,45,[50][51][52][53][54][55][56] show that the Ni-d bands of NdNiO 2 now partially overlap with the bands of Nd in-between the NiO 2 layers, forming pockets around the A and -depending on the rare earth atom and concentration of doped hole [57][58][59] the Γ momentum. If we replace Ni (3d) with Pd (4d), the Pd 4d-orbitals are shifted back down by ∼1 eV, since the larger core charge attracts electrons more strongly and the larger band-width in Pd-4d leads to a stronger d-p orbital mixing.…”

mentioning

confidence: 99%

Optimizing superconductivity: from cuprates via nickelates to palladates

Kitatani¹,

Si²,

Worm³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Motivated by cuprate and nickelate superconductors, we perform a comprehensive study of the superconducting instability in the single-band Hubbard model. We calculate the spectrum and superconducting transition temperature Tc as a function of filling and Coulomb interaction for a range of hopping parameters, combining first principles calculations with the dynamical vertex approximation. We find the sweet spot for high Tc to be at intermediate coupling, moderate Fermi surface warping, and low hole doping. Neither nickelates nor cuprates are close to this optimum. Instead, we identify some palladates, notably RbSr2PdO3 and A 2 PdO2Cl2 (A =Ba0.5La0.5), to be virtually optimal, while others, such as NdPdO2, are too weakly correlated.

show abstract

Pitfalls and solutions for perovskite transparent conductors

Cited by 5 publications

References 61 publications

Light‐Induced Mott‐Insulator‐to‐Metal Phase Transition in Ultrathin Intermediate‐Spin Ferromagnetic Perovskite Ruthenates

Light‐Induced Mott‐Insulator‐to‐Metal Phase Transition in Ultrathin Intermediate‐Spin Ferromagnetic Perovskite Ruthenates

Toward Functionalized Ultrathin Oxide Films: The Impact of Surface Apical Oxygen

Optimizing superconductivity: from cuprates via nickelates to palladates

Contact Info

Product

Resources

About