Intrinsic spin-orbit coupling in superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>δ</mml:mi></mml:math>-doped SrTiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>heterostructures

Kim, Minu; Kozuka, Y.; Bell, C. H.; Hikita, Y.; Hwang, Harold Y.

doi:10.1103/physrevb.86.085121

Cited by 62 publications

(83 citation statements)

References 40 publications

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“…The violations of the Pauli paramagnetic limit at both (001) LAO/STO interfaces and other STO based 2D superconductors are very common, 7,43,44 especially when the superconductive thickness < 20 nm. Similarly, the paramagnetic limit seems to be exceeded by a factor of three at (110) LAO/STO samples here.…”

Section: Resultsmentioning

confidence: 99%

Two-dimensional superconductivity at (110) LaAlO3/SrTiO3 interfaces

Han

Shen

You

et al. 2014

Applied Physics Letters

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Novel low dimensional quantum phenomena are expected at (110) LaAlO 3 /SrTiO 3 (LAO/STO) interfaces after the quasi two dimensional electron gas similar to that of (001) LAO/STO interfaces was found [G. Herranz et al., Sci. Rep. 2, 758 (2012) and A. Annadi et al., Nat. Commun. 4, 1838]. Here, two dimensional superconductivity of (110) LAO/STO samples with a superconducting transition temperature of 184 mK is demonstrated based on systematical transport measurements. The two dimensional characteristic of the superconductivity is confirmed by analyzing the Berezinskii-Kosterlitz-Thouless transition. The estimated superconductive thickness is about 18 nm. These features of superconductivity of (110) LAO/STO interfaces are comparable to those of (001) LAO/STO interfaces. This discovery may inspire a new round of upsurge on study of LAO/STO interfaces.

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Section: Resultsmentioning

confidence: 99%

Two-dimensional superconductivity at (110) LaAlO3/SrTiO3 interfaces

Han

Shen

You

et al. 2014

Applied Physics Letters

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“…In analogy with the ρ(T ) plot, we interpolate in the intermediate regime where D Q ∼ 1 to obtain a smooth matching of the two limits of Eq. (53). For the chosen parameters, the insulating curves [green (πK 0 = 1.5) and blue (πK 0 = 1.4)] show a monotonically increasing behavior.…”

Section: Disordered System: Random Stray Chargesmentioning

confidence: 95%

Superconductor-insulator transition in disordered Josephson-junction chains

et al. 2017

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We study the superconductor-insulator quantum phase transition in disordered Josephson junction chains. To this end, we derive the field theory from the lattice model that describes a chain of superconducting islands with a capacitive coupling to the ground (C0) as well as between the islands (C1). We analyze the theory in the short-range (C1 C0) and in the long-range (C1 C0) limits. The transition to the insulating state is driven by the proliferation of quantum phase slips. The most important source of disorder originates from trapped charges in the substrate that suppress the coherence of phase slips, thus favoring superconducting correlations. Using the renormalizationgroup approach, we determine the phase diagram and evaluate the temperature dependence of the dc conductivity and system-size dependence of the resistance around the superconductor-insulator transition. These dependences have in general strongly non-monotonic character, with several distinct regimes reflecting an intricate interplay of superconductivity and disorder.

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“…The effects of Rashba spin splitting on superconducting-state properties have been discussed for the SrTiO 3 /LaAlO 3 interface [33] and Nb-doped SrTiO 3 heterostructures [34]. For both systems, H c exceeding H P by a factor of 4 was reported.…”

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Two-Dimensional Superconducting State of Monolayer Pb Films Grown on GaAs(110) in a Strong Parallel Magnetic Field

2013

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Two-dimensional (2D) superconductivity was studied by magnetotransport measurements on single-atomic-layer Pb films on a cleaved GaAs(110) surface. The superconducting transition temperature shows only a weak dependence on the parallel magnetic field up to 14 T, which is higher than the Pauli paramagnetic limit. Furthermore, the perpendicular-magnetic-field dependence of the sheet resistance is almost independent of the presence of the parallel field component. These results are explained in terms of an inhomogeneous superconducting state predicted for 2D metals with a large Rashba spin splitting.PACS numbers: 73.20.At,Superconductivity in ultrathin films has been studied for a long time. In Ref.[1], superconductivity was observed even for a few-monolayer thickness in quenchcondensed films of Bi and Pb deposited on a glazed alumina substrate coated with amorphous Ge. Very recently, it has been revealed that superconductivity can occur in single atomic layers of Pb and In grown epitaxially on a Si(111) substrate [2,3]. A single-atomic-layer metal film on an insulating substrate is an interesting system for studies of superconductivity, not only because it is a complete two-dimensional (2D) system but also because of the broken spatial inversion symmetry. The asymmetry of the confining potential in the direction perpendicular to the 2D plane, combined with atomic spin-orbit coupling, is expected to cause the Rashba effect, which lifts the spin degeneracy of the 2D electronic states [4,5]. Actually, angle-resolved photoelectron spectroscopy measurements showed a large Rashba spin splitting of the order of 100 meV on the surfaces of heavy elements, such as Au [6], W [7], and Bi [8], and those of lighter elements, such as Si and Ge, covered with a monolayer of heavy elements, such as Bi [9][10][11].In this Letter, we report magnetotransport measurements on superconducting monolayer Pb films produced by quench condensation onto a cleaved GaAs(110) surface. Here, we focus on the effect of the magnetic field applied parallel to the surface. While the perpendicular component H ⊥ of the magnetic field strongly affects the orbital motion of electrons in the 2D plane, the parallel component H is expected to couple only to the spin degree of freedom. We show that the reduction of the superconducting transition temperature T c is very small even in strong parallel magnetic fields (H ⊥ = 0), which are much larger than the Pauli paramagnetic limit. Furthermore, the H ⊥ dependence of the sheet resistance at low temperature is found to be almost independent of the presence of H . These results are explained by assuming an inhomogeneous superconducting state predicted for Rashba spin-split 2D systems.In order to measure the sheet resistance R sq of ultrathin films, we apply the experimental procedure developed for studies on adsorbate-induced surface inversion layers on InAs [13][14][15] and InSb [16]. In this work, we used a nondoped insulating GaAs single-crystal substrate so as not to create conduction channels in the substrate...

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Intrinsic spin-orbit coupling in superconductingδ-doped SrTiO3heterostructures

Cited by 62 publications

References 40 publications

Two-dimensional superconductivity at (110) LaAlO3/SrTiO3 interfaces

Two-dimensional superconductivity at (110) LaAlO3/SrTiO3 interfaces

Superconductor-insulator transition in disordered Josephson-junction chains

Two-Dimensional Superconducting State of Monolayer Pb Films Grown on GaAs(110) in a Strong Parallel Magnetic Field

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