Dimensionality-driven metal–insulator transition in spin–orbit-coupled IrO<sub>2</sub>

Arias-Egido, E.; Laguna-Marco, M. A.; Piquer, Cristina; Jiménez-Cavero, Pilar; Lucas, I.; Morellón, L.; Gallego, Félix Gómez; Rivera-Calzada, A.; Cabero-Piris, M.; Santamarı́a, J.; Fabbris, G.; Haskel, D.; Boada, Roberto; Díaz‐Moreno, Sofía

doi:10.1039/d1nr04207f

Cited by 6 publications

(11 citation statements)

References 42 publications

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“…Instead of Ir metal, IrO 2 was chosen as the target in this growth, although the precise influence of the target material on the film quality has not been explicitly studied [112]. Epitaxial thin films were realized when single-crystalline TiO 2 substrates were used (figures 5(a)-(c)) [44,113]. The two binary metal oxides IrO 2 and TiO 2 have the same rutile structure with moderate lattice mismatches of ∼ −2.1% in the a and b-axes and ∼ 6.6% along the c-axis.…”

Section: Pulsed Laser Deposition (Pld) Of Iro 2 Thin Filmsmentioning

confidence: 99%

“…The two binary metal oxides IrO 2 and TiO 2 have the same rutile structure with moderate lattice mismatches of ∼ −2.1% in the a and b-axes and ∼ 6.6% along the c-axis. Consequently, the epitaxial IrO 2 films present different degrees of compressive or tensile strains depending on the substrate orientation and film thickness, as evidenced by x-ray reciprocal space mapping characterizations (figure 5(d)) [44,113].…”

Section: Pulsed Laser Deposition (Pld) Of Iro 2 Thin Filmsmentioning

confidence: 99%

“…The recent interest in the sputtering growth has been mainly motivated by the exotic spintronic properties of IrO 2 . Epitaxial thin films were realized on singlecrystalline TiO 2 substrates either in a pure O 2 atmosphere [113] or in an O 2 /Ar gas mixture [139]. Heterostructures composed of spin-orbit-coupled IrO 2 and ferromagnetic permalloys, such as Ni 81 Fe 19 and Co 40 Fe 40 B 20 , were deposited in situ in DC or RF sputtering systems for spin transport studies [140][141][142][143][144].…”

Section: Sputtering Growthmentioning

confidence: 99%

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Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Zhang,

Coughlin,

et al. 2024

J. Phys.: Condens. Matter

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5d transition metal oxides, such as iridates, have attracted significant interest in condensed matter physics throughout the past decade owing to their fascinating physical properties that arise from intrinsically strong spin-orbit coupling (SOC) and its interplay with other interactions of comparable energy scales. Among the rich family of iridates, iridium dioxide (IrO2), a simple binary compound long known as a promising catalyst for water splitting, has recently been demonstrated to possess novel topological states and exotic transport properties. The strong SOC and the nonsymmorphic symmetry that IrO2 possesses introduce symmetry-protected Dirac nodal lines (DNLs) within its band structure as well as a large spin Hall effect in the transport. Here, we review recent advances pertaining to the study of this unique SOC oxide, with an emphasis on the understanding of the topological electronic structures, syntheses of high crystalline quality nanostructures, and experimental measurements of its fundamental transport properties. In particular, the theoretical origin of the presence of the fourfold degenerate DNLs in band structure and its implications in the angle-resolved photoemission spectroscopy measurement and in the spin Hall effect are discussed. We further introduce a variety of synthesis techniques to achieve IrO2 nanostructures, such as epitaxial thin films and single crystalline nanowires, with the goal of understanding the roles that each key parameter plays in the growth process. Finally, we review the electrical, spin, and thermal transport studies. The transport properties under variable temperatures and magnetic fields reveal themselves to be uniquely sensitive and modifiable by strain, dimensionality (bulk, thin film, nanowire), quantum confinement, film texture, and disorder. The sensitivity, stemming from the competing energy scales of SOC, disorder, and other interactions, enables the creation of a variety of intriguing quantum states of matter.

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Section: Pulsed Laser Deposition (Pld) Of Iro 2 Thin Filmsmentioning

confidence: 99%

Section: Pulsed Laser Deposition (Pld) Of Iro 2 Thin Filmsmentioning

confidence: 99%

Section: Sputtering Growthmentioning

confidence: 99%

See 1 more Smart Citation

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Zhang,

Coughlin,

et al. 2024

J. Phys.: Condens. Matter

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“…This is measured in the belowedge region. High-energy-resolution fluorescence detection (HERFD) Bauer, 2014;Hayama et al, 2021;Friebel et al, 2015;Agote-Ara ´n et al, 2019;Arias-Egido et al, 2021;Lafuerza et al, 2020) is measured in the full excitation and detection space and particularly in the aboveedge region. Resonant inelastic X-ray scattering is a physical process, and 'RIXS' is a modern advanced technology for investigating such processes.…”

Section: Development Of Rixs and Herfdmentioning

confidence: 99%

A new satellite of manganese revealed by extended-range high-energy-resolution fluorescence detection

Tran¹,

Sier²,

Kirk³

et al. 2023

J Synchrotron Rad

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The discovery of a new physical process in manganese metal is reported. This process will also be present for all manganese-containing materials in condensed matter. The process was discovered by applying our new technique of XR-HERFD (extended-range high-energy-resolution fluorescence detection), which was developed from the popular high-resolution RIXS (resonant inelastic X-ray scattering) and HERFD approaches. The acquired data are accurate to many hundreds of standard deviations beyond what is regarded as the criterion for `discovery'. Identification and characterization of many-body processes can shed light on the X-ray absorption fine-structure spectra and inform the scientist on how to interpret them, hence leading to the ability to measure the dynamical nanostructures which are observable using the XR-HERFD method. Although the many-body reduction factor has been used universally in X-ray absorption spectroscopy in analysis over the past 30 years (thousands of papers per year), this experimental result proves that many-body effects are not representable by any constant reduction factor parameter. This paradigm change will provide the foundation for many future studies and X-ray spectroscopy.

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“…In addition, this Bi/biox nano-heterostructure had biocompatibility and biodegradability, with the surface molecular engineering used here, it improved the penetrability of tumor tissue and increased the cellar uptake, and then produced an excellent oxygen-independent tumor ablation effect. Iridium dioxide (IrO 2 ) with semiconductor behavior has high catalytic activity for oxygen release reaction (OER) in a wide pH range, and also has excellent photocatalytic efficiency ( Arias-Egido et al, 2021 ). For this, Yuan et al synthesized IrO 2 -Gox@HA NPs that could target TME by combining glucose oxidase (GOx) and IrO 2 NPs on hyaluronic acid (HA) Yuan Y. et al (2022) .…”

Section: Strategies For Nanoparticle-based Photocontrolled Deliverymentioning

confidence: 99%

Progress of Nanomaterials in Photodynamic Therapy Against Tumor

Chen

Huang

et al. 2022

Front. Bioeng. Biotechnol.

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Photodynamic therapy (PDT) is an advanced therapeutic strategy with light-triggered, minimally invasive, high spatiotemporal selective and low systemic toxicity properties, which has been widely used in the clinical treatment of many solid tumors in recent years. Any strategies that improve the three elements of PDT (light, oxygen, and photosensitizers) can improve the efficacy of PDT. However, traditional PDT is confronted some challenges of poor solubility of photosensitizers and tumor suppressive microenvironment. To overcome the related obstacles of PDT, various strategies have been investigated in terms of improving photosensitizers (PSs) delivery, penetration of excitation light sources, and hypoxic tumor microenvironment. In addition, compared with a single treatment mode, the synergistic treatment of multiple treatment modalities such as photothermal therapy, chemotherapy, and radiation therapy can improve the efficacy of PDT. This review summarizes recent advances in nanomaterials, including metal nanoparticles, liposomes, hydrogels and polymers, to enhance the efficiency of PDT against malignant tumor.

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Dimensionality-driven metal–insulator transition in spin–orbit-coupled IrO₂

Abstract: A metal-insulator transition is observed in spin-orbit-coupled IrO2 thin films upon reduction of the film thickness. In the epitaxially grown samples, the critical thickness (t : 1.5-2.2 nm) is found...

Cited by 6 publications

References 42 publications

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

A new satellite of manganese revealed by extended-range high-energy-resolution fluorescence detection

Progress of Nanomaterials in Photodynamic Therapy Against Tumor

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Dimensionality-driven metal–insulator transition in spin–orbit-coupled IrO2

Abstract: A metal-insulator transition is observed in spin-orbit-coupled IrO2 thin films upon reduction of the film thickness. In the epitaxially grown samples, the critical thickness (t : 1.5-2.2 nm) is found...

Cited by 6 publications

References 42 publications

Recent progress on topological semimetal IrO2: electronic structures, synthesis, and transport properties

Recent progress on topological semimetal IrO2: electronic structures, synthesis, and transport properties

A new satellite of manganese revealed by extended-range high-energy-resolution fluorescence detection

Progress of Nanomaterials in Photodynamic Therapy Against Tumor

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Product

Resources

About

Dimensionality-driven metal–insulator transition in spin–orbit-coupled IrO₂

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties