High-Mobility Carriers in Epitaxial IrO
              2
              Films Grown using Hybrid Molecular Beam Epitaxy

Sreejith Nair; Zhifei Yang; Kevin Storr; Bharat Jalan

doi:10.1021/acs.nanolett.4c02367

High-Mobility Carriers in Epitaxial IrO 2 Films Grown using Hybrid Molecular Beam Epitaxy

Sreejith Nair, Zhifei Yang, Kevin Storr, Bharat Jalan

Research output: Contribution to journal › Article › peer-review

Abstract

Binary rutile oxides of 5d metals such as IrO₂ stand out in comparison to their 3d and 4d counterparts due to limited experimental studies, despite rich predicted quantum phenomena. Here, we investigate the electrical transport properties of IrO₂ by engineering epitaxial thin films grown using hybrid molecular beam epitaxy. Our findings reveal phonon-limited carrier transport and thickness-dependent anisotropic in-plane resistance in IrO₂ (110) films, the latter suggesting a complex relationship between strain relaxation and orbital hybridization. Magnetotransport measurements reveal a previously unobserved nonlinear Hall effect. A two-carrier analysis of this effect shows the presence of minority carriers with mobility exceeding 3000 cm²/(V s) at 1.8 K. These results point toward emergent properties in 5d metal oxides that can be controlled using dimensionality and epitaxial strain.

Original language	English (US)
Pages (from-to)	10850-10857
Journal	Nano letters
Volume	24
Issue number	35
DOIs	https://doi.org/10.1021/acs.nanolett.4c02367
State	Published - Sep 4 2024

Bibliographical note

Publisher Copyright:
© 2024 American Chemical Society.

MRSEC Support

Partial

PubMed: MeSH publication types

Journal Article

Publisher link

10.1021/acs.nanolett.4c02367

https://pubs.acs.org/doi/10.1021/acs.nanolett.4c02367

Find It

Find It at U of M Libraries

IRG-1: Ionic Control of Materials
Leighton, C. (Leader), Birol, T. (Senior Investigator), Fernandes, R. M. (Senior Investigator), Frisbie, D. (Senior Investigator), Greven, M. (Senior Investigator), Jalan, B. (Senior Investigator), Mkhoyan, A. (Senior Investigator), Walter, J. (Senior Investigator) & Wang, X. (Senior Investigator)
9/1/20 → …
Project: Research project
University of Minnesota Materials Research Science and Engineering Center (DMR-2011401)
Leighton, C. (PI) & Lodge, T. (CoI)
THE NATIONAL SCIENCE FOUNDATION
9/1/20 → 8/31/26
Project: Research project

Cite this

@article{ceea883400e54f89825a1ab57e33b2bc,

title = "High-Mobility Carriers in Epitaxial IrO 2 Films Grown using Hybrid Molecular Beam Epitaxy",

abstract = "Binary rutile oxides of 5d metals such as IrO2 stand out in comparison to their 3d and 4d counterparts due to limited experimental studies, despite rich predicted quantum phenomena. Here, we investigate the electrical transport properties of IrO2 by engineering epitaxial thin films grown using hybrid molecular beam epitaxy. Our findings reveal phonon-limited carrier transport and thickness-dependent anisotropic in-plane resistance in IrO2 (110) films, the latter suggesting a complex relationship between strain relaxation and orbital hybridization. Magnetotransport measurements reveal a previously unobserved nonlinear Hall effect. A two-carrier analysis of this effect shows the presence of minority carriers with mobility exceeding 3000 cm2/(V s) at 1.8 K. These results point toward emergent properties in 5d metal oxides that can be controlled using dimensionality and epitaxial strain.",

author = "Sreejith Nair and Zhifei Yang and Kevin Storr and Bharat Jalan",

note = "Publisher Copyright: {\textcopyright} 2024 American Chemical Society.",

year = "2024",

month = sep,

day = "4",

doi = "10.1021/acs.nanolett.4c02367",

language = "English (US)",

volume = "24",

pages = "10850--10857",

journal = "Nano letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "35",

}

TY - JOUR

T1 - High-Mobility Carriers in Epitaxial IrO 2 Films Grown using Hybrid Molecular Beam Epitaxy

AU - Nair, Sreejith

AU - Yang, Zhifei

AU - Storr, Kevin

AU - Jalan, Bharat

PY - 2024/9/4

Y1 - 2024/9/4

N2 - Binary rutile oxides of 5d metals such as IrO2 stand out in comparison to their 3d and 4d counterparts due to limited experimental studies, despite rich predicted quantum phenomena. Here, we investigate the electrical transport properties of IrO2 by engineering epitaxial thin films grown using hybrid molecular beam epitaxy. Our findings reveal phonon-limited carrier transport and thickness-dependent anisotropic in-plane resistance in IrO2 (110) films, the latter suggesting a complex relationship between strain relaxation and orbital hybridization. Magnetotransport measurements reveal a previously unobserved nonlinear Hall effect. A two-carrier analysis of this effect shows the presence of minority carriers with mobility exceeding 3000 cm2/(V s) at 1.8 K. These results point toward emergent properties in 5d metal oxides that can be controlled using dimensionality and epitaxial strain.

AB - Binary rutile oxides of 5d metals such as IrO2 stand out in comparison to their 3d and 4d counterparts due to limited experimental studies, despite rich predicted quantum phenomena. Here, we investigate the electrical transport properties of IrO2 by engineering epitaxial thin films grown using hybrid molecular beam epitaxy. Our findings reveal phonon-limited carrier transport and thickness-dependent anisotropic in-plane resistance in IrO2 (110) films, the latter suggesting a complex relationship between strain relaxation and orbital hybridization. Magnetotransport measurements reveal a previously unobserved nonlinear Hall effect. A two-carrier analysis of this effect shows the presence of minority carriers with mobility exceeding 3000 cm2/(V s) at 1.8 K. These results point toward emergent properties in 5d metal oxides that can be controlled using dimensionality and epitaxial strain.

U2 - 10.1021/acs.nanolett.4c02367

DO - 10.1021/acs.nanolett.4c02367

M3 - Article

C2 - 39173119

SN - 1530-6984

VL - 24

SP - 10850

EP - 10857

JO - Nano letters

JF - Nano letters

IS - 35

ER -

High-Mobility Carriers in Epitaxial IrO 2 Films Grown using Hybrid Molecular Beam Epitaxy

Abstract

Bibliographical note

MRSEC Support

PubMed: MeSH publication types

Publisher link

Find It

Fingerprint

Projects

IRG-1: Ionic Control of Materials

University of Minnesota Materials Research Science and Engineering Center (DMR-2011401)

Cite this