Dynamics of vortex matter in YBCO sub-micron bridges

Papari, Gian Paolo; Carillo, F.; Stornaiuolo, Daniela; Massarotti, Davide; Longobardi, L.; Beltram, Fabio; Tafuri, F.

doi:10.1016/j.physc.2014.06.017

Cited by 21 publications

(15 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both the magnetoresistance and temperature, R(T ), dependences, are taken employing a lock-in amplifier, feeding the sample with a current modulated at 17.3 Hz. Excitation signals were of the order of 300 nA to avoid heating and/or excessive perturbation of vortex dynamics27 effects. Magnetic field step was about Δ B = 10 mT, i.e., one tenth of the expected B c1 (see below).…”

Section: Methodsmentioning

confidence: 99%

Geometrical vortex lattice pinning and melting in YBaCuO submicron bridges

Papari

Glatz

Carillo

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

Since the discovery of high-temperature superconductors (HTSs), most efforts of researchers have been focused on the fabrication of superconducting devices capable of immobilizing vortices, hence of operating at enhanced temperatures and magnetic fields. Recent findings that geometric restrictions may induce self-arresting hypervortices recovering the dissipation-free state at high fields and temperatures made superconducting strips a mainstream of superconductivity studies. Here we report on the geometrical melting of the vortex lattice in a wide YBCO submicron bridge preceded by magnetoresistance (MR) oscillations fingerprinting the underlying regular vortex structure. Combined magnetoresistance measurements and numerical simulations unambiguously relate the resistance oscillations to the penetration of vortex rows with intermediate geometrical pinning and uncover the details of geometrical melting. Our findings offer a reliable and reproducible pathway for controlling vortices in geometrically restricted nanodevices and introduce a novel technique of geometrical spectroscopy, inferring detailed information of the structure of the vortex system through a combined use of MR curves and large-scale simulations.

show abstract

Section: Methodsmentioning

confidence: 99%

Geometrical vortex lattice pinning and melting in YBaCuO submicron bridges

Papari

Glatz

Carillo

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The curves are characterized by a broadening, which is larger in 3EBL devices. Such a broadening, expected in nanowires with width w much larger than the coherence length ξ [w ≫ 4.4ξðTÞ even at T ≈ T C ], can be ascribed to the dissipation induced by vortices, perpendicular to the bias current, crossing the nanowire [35][36][37][38]. The resistance of 1EBL and 3EBL nanowires can be written as…”

Section: B Analysis Of the Resistance Versus Temperature Transitionmentioning

confidence: 99%

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

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.

show abstract

“…In 2D wires like the one of Figs. 3-5, where the width is much bigger than the coherence length ξ(w 4.4ξ(T )) even at T ≈ T C , vortices crossing the wire, perpendicular to the bias current, have been demonstrated to be the dominant mechanism of dissipation [16]- [19]. Considering the vortex entry potential obtained in [18], we can write the zero bias resistance of the wire as:…”

Section: Ozone Treatment On Ybco Nanowiresmentioning

confidence: 99%

Toward <inline-formula> <tex-math notation="TeX">$\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$</tex-math></inline-formula> Nanoscale Structures for Hybrid Devices

Baghdadi

Arpaia

Lombardi

2015

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

An ex situ ozone annealing has been applied both on YBa 2 Cu 3 O 7−δ (YBCO) films and nanowires. From the investigation on bare films, by measuring the superconducting resistive transition in temperature and the X-ray diffraction pattern, we have observed that the ozonation can be a powerful tool to oxygenate the YBCO structure. To probe the effective role of this reactive annealing on nanostructures, we have fabricated nanowires with widths down to 100 nm, covered by a 20-nm-thick Au layer. We have compared the critical current density and the broadening of the resistance transition measured before and after the ozone treatment, concluding that the ozone is instrumental in recovering very high quality superconducting properties inside the nanostructures, which were degraded by the oxygen out-diffusion occurring during the nanopatterning.

show abstract

Dynamics of vortex matter in YBCO sub-micron bridges

Cited by 21 publications

References 53 publications

Geometrical vortex lattice pinning and melting in YBaCuO submicron bridges

Geometrical vortex lattice pinning and melting in YBaCuO submicron bridges

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

Toward <inline-formula> <tex-math notation="TeX">$\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$</tex-math></inline-formula> Nanoscale Structures for Hybrid Devices

Contact Info

Product

Resources

About

Dynamics of vortex matter in YBCO sub-micron bridges

Cited by 21 publications

References 53 publications

Geometrical vortex lattice pinning and melting in YBaCuO submicron bridges

Geometrical vortex lattice pinning and melting in YBaCuO submicron bridges

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

Toward <inline-formula> <tex-math notation="TeX">$\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$</tex-math></inline-formula> Nanoscale Structures for Hybrid Devices

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