Scanning SQUID View of Oxide Interfaces

Persky, Eylon; Kalisky, Beena

doi:10.1002/adma.201706653

Cited by 13 publications

(13 citation statements)

References 78 publications

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“…We therefore used scanning superconducting quantum interference device (SQUID) microscopy to image the current flow in proximity to the gate-tunable metal-insulator transition (MIT) at the LaAlO 3 /SrTiO 3 (LAO/STO) interface. On the metallic side, the conductivity of LAO/STO is weakly modulated (in space) over structural domain patterns, which emerge from the STO substrate 12 – 15 . They lead to narrow, elongated, highly conducting channels, with lengths comparable to those of mesoscopic devices 16 .…”

Section: Introductionmentioning

confidence: 99%

Non-universal current flow near the metal-insulator transition in an oxide interface

et al. 2021

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In systems near phase transitions, macroscopic properties often follow algebraic scaling laws, determined by the dimensionality and the underlying symmetries of the system. The emergence of such universal scaling implies that microscopic details are irrelevant. Here, we locally investigate the scaling properties of the metal-insulator transition at the LaAlO3/SrTiO3 interface. We show that, by changing the dimensionality and the symmetries of the electronic system, coupling between structural and electronic properties prevents the universal behavior near the transition. By imaging the current flow in the system, we reveal that structural domain boundaries modify the filamentary flow close to the transition point, preventing a fractal with the expected universal dimension from forming.

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Section: Introductionmentioning

confidence: 99%

Non-universal current flow near the metal-insulator transition in an oxide interface

et al. 2021

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“…Superconducting quantum interference devices (SQUIDs) are magnetic flux detectors with ultra-high sensitivity 1,2 . These devices are applied for various applications such as medical diagnostics 3–5 and magnetic material microstructure analysis 6–8 . Current high-performance SQUIDs are generally constructed from low-temperature superconductors such as Nb/AlO X /Nb 9 or Al/AlO X /Al Josephson junctions because of their reliability and stability.…”

Section: Introductionmentioning

confidence: 99%

Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure

Kageura

Hideko

Tsuyuzaki

et al. 2019

Sci Rep

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Superconducting quantum interference devices (SQUIDs) are currently used as magnetic flux detectors with ultra-high sensitivity for various applications such as medical diagnostics and magnetic material microstructure analysis. Single-crystalline superconducting boron-doped diamond is an excellent candidate for fabricating high-performance SQUIDs because of its robustness and high transition temperature, critical current density, and critical field. Here, we propose a fabrication process for a single-crystalline boron-doped diamond Josephson junction with regrowth-induced step edge structure and demonstrate the first operation of a single-crystalline boron-doped diamond SQUID above 2 K. We demonstrate that the step angle is a significant parameter for forming the Josephson junction and that the step angle can be controlled by adjusting the microwave plasma-enhanced chemical vapour deposition conditions of the regrowth layer. The fabricated junction exhibits superconductor–weak superconductor–superconductor-type behaviour without hysteresis and a high critical current density of 5800 A/cm2.

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“…Salje et al [6] used piezoelectric measurements to suggest that instead of a global ferroelectric state, the STO structural domain walls develop polarity below 40 K. Local measurements support this scenario [7]. Here we focus on properties that are modulated on the STO domain structure, and track their effects on the LAO/STO conductive interface [8][9][10][11][12]. Below~37 K, the current flowing at the interface is modulated along the structural domain walls [13].…”

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confidence: 92%

Magnetism and Conductivity Along Structural Domain Walls of SrTiO3

Frenkel

Xie

Hwang

et al. 2019

J Supercond Nov Magn

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The interface between the oxide insulators LaAlO 3 and SrTiO 3 (LAO/STO) hosts a two-dimensional electron gas. The combination of interfacial conductivity and superconductivity at ultra-low temperatures with the physical phenomena of the oxide parent materials has fueled extensive research in the field since its discovery in 2004. Scanning superconducting quantum interference device (SQUID) measurements have shown that structural domain walls, formed below 105 K, modulate the current flow at the interface and recently revealed weak magnetic signals along the same domain structure. Here we use scanning SQUID to investigate the temperature dependence of different electronic properties of the LAO/STO interface. We find correlation between magnetism and conductivity, which are both spatially modulated on the domain structure. This data suggests a possible relation between the populations of electrons participating in each order.

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Scanning SQUID View of Oxide Interfaces

Cited by 13 publications

References 78 publications

Non-universal current flow near the metal-insulator transition in an oxide interface

Non-universal current flow near the metal-insulator transition in an oxide interface

Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure

Magnetism and Conductivity Along Structural Domain Walls of SrTiO3

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