Bimodal Phase Diagram of the Superfluid Density in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>LaAlO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>/</mml:mo><mml:mi>SrTi</mml:mi><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
 Revealed by an Interfacial Waveguide Resonator

Manca, Nicola; Bothner, Daniel; Monteiro, A. M. R. V. L.; Davidovikj, Dejan; Saǧlam, Yildiz G.; Jenkins, M.; Gabay, M.; Steele, Gary A.; Caviglia, Andrea D.

doi:10.1103/physrevlett.122.036801

Cited by 14 publications

(20 citation statements)

References 52 publications

(60 reference statements)

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“…More recently, magnetotransport data on LAO/STO using different substrate crystalline orientations reveal a robustness of superconductivity for the heavy-mass electrons from d xz and d yz orbitals [41], while the light-mass electrons from d xy have higher mobility and thus dominate the normal state charge transport behavior instead. In addition, several microwave resonator measurements [42,43] also revealed that the superfluid density at LAO/STO interface is more than an order of magnitude lower than the electron density. Those results are in accord with our observation of the unusual weak R dependence on the Pauli-paramagnetic coupling strength in sample A as shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Determination of spin-orbit scattering lifetime at the interface of LaAlO3/SrTiO3 from the superconducting upper critical fields

Singh

Song

et al. 2020

Phys. Rev. Research

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The intrinsic mechanism of the spin-orbit coupling at the LaAlO 3 /SrTiO 3 interface remains a debatable issue. Rashba-type spin-orbit coupling is an appealing candidate that has been demonstrated by several magnetotransport results. On the other hand, the atomic spin-orbit coupling was also shown to play an important role, particularly when the Fermi level is close to the Lifshitz point. In this paper, we focus on the measurements of the anisotropic superconducting upper critical fields in gated LaAlO 3 /SrTiO 3 devices. By rigorous fittings of the H c2 -T curves using both the Werthamer-Helfand-Hohenberg theory and Klemm-Luther-Beasley model, an upper limit of the spin-orbit scattering lifetime can be determined in the two-dimensional limit of the superconducting state. We found that the extracted spin-orbit scattering lifetime monotonically increases with the effective transport lifetime that spans over two orders of magnitude in the regime with sheet density close to and higher than that at the Lifshitz point. Those results suggest the dominant role of Elliott-Yafet type spin relaxation. The comparison to the weak localization fittings on magnetoconductance reveals a striking difference. Such a model dependence infers an electronic phase separation at the LaAlO 3 /SrTiO 3 interface, where the superconductivity originates from a selective d-subband occupancy.

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Section: Discussionmentioning

confidence: 99%

Determination of spin-orbit scattering lifetime at the interface of LaAlO3/SrTiO3 from the superconducting upper critical fields

Singh

Song

et al. 2020

Phys. Rev. Research

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“…In addition, there are also definite indications of intrinsic inhomogeneities in the normal 24,25 and superconducting [26][27][28] states of the LAO/STO interface originating either from structural domains or electronic phase separation 29 . Therefore, the superconducting phase is likely to be marked by nonuniform superconducting islands 28,30,31 . While these strong nonmagnetic inhomogeneities, at first sight, can be incompatible with an unconventional type of pairing, it has been recently figured out that extra internal degrees of freedom such as orbitals, sublattices, or valleys can protect Cooper pairs from strong scattering 32 .…”

Section: Introductionmentioning

confidence: 99%

Gate-tunable pairing channels in superconducting non-centrosymmetric oxides nanowires

et al. 2022

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Two-dimensional SrTiO3-based interfaces stand out among non-centrosymmetric superconductors due to their intricate interplay of gate-tunable Rashba spin-orbit coupling and multi-orbital electronic occupations, whose combination theoretically prefigures various forms of non-standard superconductivity. By employing superconducting transport measurements in nano-devices we present strong experimental indications of unconventional superconductivity in the LaAlO3/SrTiO3 interface. The central observations are the substantial anomalous enhancement of the critical current by small magnetic fields applied perpendicularly to the plane of electron motion, and the asymmetric response with respect to the magnetic field direction. These features cannot be accommodated within a scenario of canonical spin-singlet superconductivity. We demonstrate that the experimental observations can be described by a theoretical model based on the coexistence of Josephson channels with intrinsic phase shifts. Our results exclude a time-reversal symmetry breaking scenario and suggest the presence of anomalous pairing components that are compatible with inversion symmetry breaking and multi-orbital physics.

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“…Additionally, there are also definite indications of intrinsic inhomogeneities in the normal [24,25] and superconducting [26][27][28] states of the LAO/STO interface originating either from structural domains or electronic phase separation [29]. Therefore, the superconducting phase is likely to be marked by nonuniform superconducting islands [28,30,31]. While these strong nonmagnetic inhomogeneities at first sight can be incompatible with an unconventional type of pairing, it has been recently figured out that extra internal degrees of freedom such as orbitals, sublattices, or valleys can protect Cooper pairs from strong scattering [32].…”

mentioning

confidence: 99%

Gate-tunable hallmarks of unconventional superconductivity in non-centrosymmetric nanowires

Singh,

Guarcello,

Lesne

et al. 2021

Preprint

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Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator

Cited by 14 publications

References 52 publications

Determination of spin-orbit scattering lifetime at the interface of LaAlO3/SrTiO3 from the superconducting upper critical fields

Determination of spin-orbit scattering lifetime at the interface of LaAlO3/SrTiO3 from the superconducting upper critical fields

Gate-tunable pairing channels in superconducting non-centrosymmetric oxides nanowires

Gate-tunable hallmarks of unconventional superconductivity in non-centrosymmetric nanowires

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