Superconductivity and Weak Anti-localization at KTaO3 (111) Interfaces

Al-Tawhid, Athby H.; Kanter, Jesse; Hatefipour, Mehdi; Kumah, Divine P.; Shabani, Javad; Ahadi, Kaveh

doi:10.1007/s11664-022-09844-9

Cited by 14 publications

(11 citation statements)

References 40 publications

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“…[ 28 ] Such saturated residual resistance grows as B increases. The further magnetoresistance isotherms in Figure 1b exhibit an anomalous magnetoresistance at low field (a zoom‐in image in Figure 1c), which is superimposed on the typical U‐shaped magnetoresistance derived from the B ‐induced superconducting transition and may relate to the RSOC [ 15,26 ] as discussed in detail later. The presence of SOC in SC has an impact on upper critical field B c2 , where the Werthamer–Helfand–Hohenberg (WHH) model incorporating the spin‐paramagnetic and spin–orbit scattering terms was developed to describe the behavior of T ‐dependent B c2 (Figure 1d) [ 29 ] (Section S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 84%

“…However, to date, the RSOC of 5d 2DESs has been investigated exclusively at KTO (001) interfaces without SC, and the RSOC at superconducting KTO (110) or (111) interface was rarely investigated. [26,27] In this work, we achieved a very large RSOC at a superconducting Hf 0.5 Zr 0.5 O 2 /KTaO 3 (110) heterostructure grown at room temperature. The typical superconducting transition is observed at T c ≈ 0.62 K. Meanwhile, the investigation of weak antilocalization (WAL) suggests a giant RSOC in this system.…”

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

et al. 2023

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The 2D electron system (2DES) at the KTaO 3 surface or heterointerface with 5d orbitals hosts extraordinary physical properties, including a stronger Rashba spin-orbit coupling (RSOC), higher superconducting transition temperature, and potential of topological superconductivity. Herein, a huge enhancement of RSOC under light illumination achieved at a superconducting amorphous-Hf 0.5 Zr 0.5 O 2 /KTaO 3 (110) heterointerface is reported. The superconducting transition is observed with T c = 0.62 K and the temperature-dependent upper critical field reveals the interaction between spin-orbit scattering and superconductivity. A strong RSOC with B so = 1.9 T is revealed by weak antilocalization in the normal state, which undergoes sevenfold enhancement under light illumination. Furthermore, RSOC strength develops a dome-shaped dependence of carrier density with the maximum of B so = 12.6 T achieved near the Lifshitz transition point n c ≈ 4.1 × 10 13 cm −2 . The highly tunable giant RSOC at KTaO 3 (110)-based superconducting interfaces show great potential for spintronics.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 80%

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Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

et al. 2023

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“…A monotonic decrease in resistivity with the decrease in temperature is observed which confirms the formation of conducting channel at the interface of LVO/KTO (unlike previously reported LaCrO 3 /KTaO 3 interface where an upturn is observed below 15 K). [ 23 ]…”

Section: Resultsmentioning

confidence: 99%

Possible Signatures of Chiral Anomaly in the Magnetoresistance of a Quasi‐2‐Dimensional Electron Gas at the Interface of LaVO₃ and KTaO₃

Silotia¹,

Kumari²,

Gupta³

et al. 2022

Adv Elect Materials

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In a Dirac semimetal, charges flow between two Weyl nodes when electric and magnetic fields (E||B) are parallel to each other manifesting interesting physical properties such as negative longitudinal magnetoresistance (NLMR), planar Hall effect (PHE). A co‐existence of weak antilocalization (WAL) is observed with large NLMR and an unusual Hall resistance with (B||E) configuration, at the conducting interface of LaVO3 (LVO) and KTaO3 (KTO). The full‐width half maxima of the depth of the conducting channel at the interface is estimated to be around 10 nm by using spectroscopy techniques of photoluminescence and time‐correlated single‐photon counting: suggesting a quasi‐2‐dimensional nature of the conducting electrons. The PHE exhibits oscillatory behavior as a function of the angle between E and B. Very similar temperature dependence of NLMR and PHE suggest a strong correlation among them.

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“…KTaO 3 is a cubic perovskite and an incipient ferroelectric ( 13 , 14 ). Figure 1 (A and B) shows the schematic crystal structure of the KTaO 3 (111) surface.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic superconductivity at KTaO ₃ (111) interfaces

et al. 2023

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A two-dimensional, anisotropic superconductivity was recently found at the KTaO 3 (111) interfaces. The nature of the anisotropic superconducting transition remains a subject of debate. To investigate the origins of the observed behavior, we grew epitaxial KTaO 3 (111)-based heterostructures. We show that the superconductivity is robust against the in-plane magnetic field and violates the Pauli limit. We also show that the Cooper pairs are more resilient when the bias is along [11 2 ¯ ] (I ∥ [11 2 ¯ ]) and the magnetic field is along [1 1 ¯ 0] ( B ∥ [1 1 ¯ 0]). We discuss the anisotropic nature of superconductivity in the context of electronic structure, orbital character, and spin texture at the KTaO 3 (111) interfaces. The results point to future opportunities to enhance superconducting transition temperatures and critical fields in crystalline, two-dimensional superconductors with strong spin-orbit coupling.

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Superconductivity and Weak Anti-localization at KTaO3 (111) Interfaces

Cited by 14 publications

References 40 publications

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

Possible Signatures of Chiral Anomaly in the Magnetoresistance of a Quasi‐2‐Dimensional Electron Gas at the Interface of LaVO₃ and KTaO₃

Anisotropic superconductivity at KTaO ₃ (111) interfaces

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Superconductivity and Weak Anti-localization at KTaO3 (111) Interfaces

Cited by 14 publications

References 40 publications

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO3(110) Heterointerfaces

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO3(110) Heterointerfaces

Possible Signatures of Chiral Anomaly in the Magnetoresistance of a Quasi‐2‐Dimensional Electron Gas at the Interface of LaVO3 and KTaO3

Anisotropic superconductivity at KTaO 3 (111) interfaces

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Resources

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Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

Possible Signatures of Chiral Anomaly in the Magnetoresistance of a Quasi‐2‐Dimensional Electron Gas at the Interface of LaVO₃ and KTaO₃

Anisotropic superconductivity at KTaO ₃ (111) interfaces