Quasi-two-dimensional electron gas and weak antilocalization at the interface of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SrTaO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mi>KTa</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
 heterostructures

Zhang, Xiaoyu; Pang, Zhentao; Yin, Chenghao; Yan, Mingyuan; Lv, Yang-Yang; Deng, Yu; Zhang, Shan-Tao

doi:10.1103/physrevb.108.235114

Phys. Rev. B

2023

DOI: 10.1103/physrevb.108.235114

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Quasi-two-dimensional electron gas and weak antilocalization at the interface of SrTaO3/KTaO3 heterostructures

Xiaoyu Zhang,

Zhentao Pang,

Chenghao Yin

et al.

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2024

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Cited by 3 publications

References 48 publications

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Anomalous Hall effect in 5d/5d SrTaO3/SrIrO3 superlattices driven by ferromagnetism and spin–orbit coupling

Zhang,

Pang,

et al. 2024

Applied Physics Letters

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The observation of the anomalous Hall effect (AHE) in 5d perovskite oxides has been challenging due to their lack or weak ferromagnetic order, which is necessary for breaking time-reversal symmetry. Here, we present compelling evidence of ferromagnetism and consequent AHE in a series of carefully designed and fabricated 5d/5d SrTaO3/SrIrO3 (STO/SIO) superlattices. The coexistence of Ta5+ and Ta4+ chemical states induces ferromagnetism in the STO layer, while the interfacial magnetic proximity effect further enhances it in the SIO layer, resulting in both ferromagnetism and AHE within the STO/SIO superlattice. Additionally, the strong spin–orbit coupling between Ta and Ir elements positively contributes to enhancing the AHE. This work offers an alternative approach for designing artificial materials with AHE and holds potential for advancing spintronics.

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Anomalous Hall effect in 5d/5d SrTaO3/SrIrO3 superlattices driven by ferromagnetism and spin–orbit coupling

Zhang,

Pang,

et al. 2024

Applied Physics Letters

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Layer-dependent electronic structures and magnetic ground states of polar-polar LaVO3/KTaO3 (001) heterostructures

Patel,

Mohanta,

Nandy

et al. 2024

Phys. Rev. B

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Large Rashba spin–orbit coupling in metallic SrTaO₃ thin films

Okuma,

Katayama,

Kadowaki

et al. 2024

Appl. Phys. Express

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We fabricated conductive SrTaO3 epitaxial films on insulator substrates and measured the Rashba parameter using weak anti-localization analysis. The Rashba parameter, reaching up to 9.9 × 10−13 eVm, is the highest among metallic oxides and is comparable to the LaAlO3/SrTiO3 interface, which is widely used in Rashba effect studies. This indicates the potential for oxide-based spintronic devices. To use them as devices, it is important to investigate how film thickness affects the resistivity. Films ranging from 8.6 to 25 nm exhibited metallic conduction, but those thicker than 25 nm showed an unexpected increase in resistivity, suggesting instability of the meta-stable Ta4+ state.

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Quasi-two-dimensional electron gas and weak antilocalization at the interface of SrTaO3/KTaO3 heterostructures

Cited by 3 publications

References 48 publications

Anomalous Hall effect in 5d/5d SrTaO3/SrIrO3 superlattices driven by ferromagnetism and spin–orbit coupling

Anomalous Hall effect in 5d/5d SrTaO3/SrIrO3 superlattices driven by ferromagnetism and spin–orbit coupling

Layer-dependent electronic structures and magnetic ground states of polar-polar LaVO3/KTaO3 (001) heterostructures

Large Rashba spin–orbit coupling in metallic SrTaO₃ thin films

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Quasi-two-dimensional electron gas and weak antilocalization at the interface of SrTaO3/KTaO3 heterostructures

Cited by 3 publications

References 48 publications

Anomalous Hall effect in 5d/5d SrTaO3/SrIrO3 superlattices driven by ferromagnetism and spin–orbit coupling

Anomalous Hall effect in 5d/5d SrTaO3/SrIrO3 superlattices driven by ferromagnetism and spin–orbit coupling

Layer-dependent electronic structures and magnetic ground states of polar-polar LaVO3/KTaO3 (001) heterostructures

Large Rashba spin–orbit coupling in metallic SrTaO3 thin films

Contact Info

Product

Resources

About

Large Rashba spin–orbit coupling in metallic SrTaO₃ thin films