YBa 2 Cu 3 O 7−δ nanorings to probe fluxoid quantization in High Critical Temperature Superconductors

Arpaia, Riccardo; Charpentier, Sophie; Toskovic, R.; Lombardi, Floriana

doi:10.1016/j.physc.2014.06.015

Cited by 14 publications

(13 citation statements)

References 27 publications

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“…According to Eq. (2), the superconducting transition becomes broader when decreasing the wire width w and thickness t. In previous reports [37,39], we show that in YBCO nanowires protected by a 50-nm-thick Au layer the broadening at the transition can be fitted with Eqs. (1) and (2) considering the geometrical nanowire dimensions.…”

Section: Figsupporting

confidence: 60%

Fabricating Nanogaps inYBa2Cu3O7−δ
Baghdadi
¹
,
Arpaia
²
,
Charpentier
³

et al. 2015
Phys. Rev. Applied
21
1
25
0
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The advances of nanotechnologies applied to high-critical-temperature superconductors (HTSs) have recently given a huge boost to the field, opening new prospectives for their integration in hybrid devices. The feasibility of this research goes through the realization of HTS nanogaps with superconductive properties close to the as-grown bulk material at the nanoscale. Here we present a fabrication approach allowing the realization of YBa 2 Cu 3 O 7−δ (YBCO) nanogaps with dimensions as small as 35 nm. To assess the quality of the nanogaps, we measure, before and after an ozone treatment, the current-voltage characteristics and the resistance versus temperature of YBCO nanowires with various widths and lengths, fabricated by using different lithographic processes. The analysis of the superconducting transition with a thermally activated vortex-entry model allows us to determine the maximum damage the nanowires undergo during the patterning which relates to the upper bound for the dimension of the nanogap. We find that the effective width of the nanogap is of the order of 100 nm at the superconducting transition temperature while retaining the geometrical value of about 35 nm at lower temperatures. The feasibility of the nanogaps for hybrid Josephson devices is demonstrated by bridging them with thin Au films. We detect a Josephson coupling up to 85 K with an almost ideal magnetic-field response of the Josephson current. These results pave the way for the realization of complex hybrid devices, where tiny HTS nanogaps can be instrumental to study the Josephson effect through barriers such as topological insulators or graphene.

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Section: Figsupporting

confidence: 60%

Fabricating Nanogaps inYBa2Cu3O7−δ
Baghdadi
¹
,
Arpaia
²
,
Charpentier
³

et al. 2015
Phys. Rev. Applied
21
1
25
0
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show abstract

“…By considering nanowire dimensions very close to the geometrical ones (see Table I), we have found a very good agreement of our experimental data with the model. The extracted zero-temperature superconducting coherence length, ξ b (0) value (2.8 nm) is very close (see Table I) to those reported in literature and associated with nanostructures patterned on c-axis films [33,39,41]. The anisotropy ratio ξ b (0)/ξ c (0) ≈ 5 is lower than that of the London penetration depths: this could be due to the uncertainty in the specific 184505-4 TABLE I.…”

Section: Nanostructures To Study In-plane London Anisotropysupporting

confidence: 82%

Study of in-plane electrical transport anisotropy of a -axis oriented YBa2Cu3O7−δ nanodevices

et al. 2017

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In the present work, we report the growth of fully untwinned high-quality a-axis-oriented YBa 2 Cu 3 O 7−δ films on (100) SrLaGaO 4 substrates by using PrBa 2 Cu 3 O 7−δ as a buffer layer. We also fabricated nanowires at different angles γ with respect to the [0,1,0] direction of the substrate and studied the in-plane anisotropy of the critical current density, which we explained by considering the anisotropy in the coherence length ξ and London penetration depth λ L . Finally, half-integer Shapiro-like steps measured in slightly underdoped c-axis oriented (γ = 90• ) nanowires point towards a different transport regime, which could shed light on intriguing issues of high-critical-temperature superconductors.

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“…However, the behavior of our nanorings is qualitatively differ- ent from classical DC SQUIDs: modulation is not sinusoidal, and the critical current is a multivalued periodic function of the magnetic field. A similar effect was previously reported in micro-SQUIDs with weak links formed by Dayem bridges [50,51], in YBCO nanowire SQUIDs [52], and asymmetric MoGe nanowire SQUIDs [53]. A long nanowire with L > ξ has very high kinetic inductance that results in a large phase gradient and nonsinusoidal current-phase relationship along the nanowire [40].…”

Section: E Magnetic Field Dependencesupporting

confidence: 79%

Homogeneous superconductivity at the LaAlO3/SrTiO3 interface probed by nanoscale transport

et al. 2017

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An interface between LaAlO 3 and SrTiO 3 (LAO/STO) may host two-dimensional superconductivity, strong spin-orbit coupling, and magnetic ordering. There are indications that the interfacial superconducting layer is nonhomogeneous at the nanoscale. The presence of inhomogeneities may have strong implications on the superconducting transport properties and lead to formation of weak links between superconducting regions. In this paper, we report on the temperature and magnetic field dependence of superconducting transport in single nanowires and nanorings fabricated in a LAO/STO interface. The analysis of data proves that our nanostructures behave like uniform superconducting filaments carrying a critical current close to the theoretical Ginzburg-Landau depairing limit. Furthermore, we unexpectedly find an enhancement of the critical current of LAO/STO nanowires and nanorings at low temperature when a magnetic field is applied. Our results point towards the coexistence of a homogeneous interfacial superconductivity and spatially separated magnetism at the LAO/STO interface.

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YBa 2 Cu 3 O 7−δ nanorings to probe fluxoid quantization in High Critical Temperature Superconductors

Cited by 14 publications

References 27 publications

Fabricating Nanogaps inYBa2Cu3O7−δ
Baghdadi
¹
,
Arpaia
²
,
Charpentier
³

et al. 2015
Phys. Rev. Applied
21
1
25
0
View full text Add to dashboard Cite

Fabricating Nanogaps inYBa2Cu3O7−δ
Baghdadi
¹
,
Arpaia
²
,
Charpentier
³

et al. 2015
Phys. Rev. Applied
21
1
25
0
View full text Add to dashboard Cite

Study of in-plane electrical transport anisotropy of a -axis oriented YBa2Cu3O7−δ nanodevices

Homogeneous superconductivity at the LaAlO3/SrTiO3 interface probed by nanoscale transport

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YBa 2 Cu 3 O 7−δ nanorings to probe fluxoid quantization in High Critical Temperature Superconductors

Cited by 14 publications

References 27 publications

Fabricating Nanogaps inYBa2Cu3O7−δBaghdadi1, Arpaia2, Charpentier3 et al. 2015Phys. Rev. Applied211250View full textAdd to dashboardCite

Fabricating Nanogaps inYBa2Cu3O7−δBaghdadi1, Arpaia2, Charpentier3 et al. 2015Phys. Rev. Applied211250View full textAdd to dashboardCite

Study of in-plane electrical transport anisotropy of a -axis oriented YBa2Cu3O7−δ nanodevices

Homogeneous superconductivity at the LaAlO3/SrTiO3 interface probed by nanoscale transport

Contact Info

Product

Resources

About

Fabricating Nanogaps inYBa2Cu3O7−δ
Baghdadi
¹
,
Arpaia
²
,
Charpentier
³

et al. 2015
Phys. Rev. Applied
21
1
25
0
View full text Add to dashboard Cite

Fabricating Nanogaps inYBa2Cu3O7−δ
Baghdadi
¹
,
Arpaia
²
,
Charpentier
³

et al. 2015
Phys. Rev. Applied
21
1
25
0
View full text Add to dashboard Cite