2022
DOI: 10.1038/s41535-021-00406-6
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Gate-tunable pairing channels in superconducting non-centrosymmetric oxides nanowires

Abstract: 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 s… Show more

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Cited by 16 publications
(16 citation statements)
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“…Hallmarks of a Josephson junction based on this type of NCSs are: i) unique CPR with ϕ-phase and dominant high-harmonics, ii) anomalous temperature dependence of the critical current with a linear upturn at low temperature and iii) maximum of the critical current at finite applied magnetic field in the Fraunhofer pattern. We discuss how this type of pairing can account for the recent observations on supercurrents behavior in oxides interface superconductors [30,31]. Orbital-singlet spin-triplet pairs and d-vector profile along the Fermi lines.…”
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confidence: 88%
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“…Hallmarks of a Josephson junction based on this type of NCSs are: i) unique CPR with ϕ-phase and dominant high-harmonics, ii) anomalous temperature dependence of the critical current with a linear upturn at low temperature and iii) maximum of the critical current at finite applied magnetic field in the Fraunhofer pattern. We discuss how this type of pairing can account for the recent observations on supercurrents behavior in oxides interface superconductors [30,31]. Orbital-singlet spin-triplet pairs and d-vector profile along the Fermi lines.…”
mentioning
confidence: 88%
“…Observations of CPR in form of ϕ 0 or ϕ-junctions as well as 0-π transitions have been reported in a variety of devices based on InSb nanowires [26], ferromagnetic heterostructures [20], superconducting spin valves [27,28], and junctions with superconducting materials having non-trivial gap symmetry (e.g. iron picnitides [29], oxides interface [30,31], and cuprates [22,23,32]). Here, competing 0and π-Josephson channels lead to a vanishing first harmonic with a consequent dominant role of the second harmonic in determining the Josephson CPR.…”
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confidence: 97%
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“…A special role in this context is played by the so called πphase shifts and π-pairing, i.e., antiphase relation between order parameters or equivalently the sign reversal of the effective Josephson coupling between Cooper pairs. This is at the heart of unconventional superconductivity, e.g., in cuprates [3,4], iron-based [5,6] and oxide interface superconductors [7,8], superconductor-ferromagnetsuperconductor junctions [9], phase qubits [10], electrically or orbitally driven superconducting phases [11][12][13][14],…”
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confidence: 99%
“…However, when there is no simple phase ordering pattern that satisfies all Josephson couplings, the unsatisfied one is said to be frustrated. Along this line, disentangling the complexity arising from superconducting phase frustration in the presence of 0 and π-pairings is a demanding and non-trivial achievement [5,6,8,17].…”
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confidence: 99%

Frustration driven Josephson phase dynamics

Guarcello,
Chirolli,
Mercaldo
et al. 2022
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