Vortex lattice in Bi2Sr2CaCu2O8+δ well above the first-order phase-transition boundary

Torres, J. H. S.; Silva, Robson R. da; Moehlecke, S.; Kopelevich, Y.

doi:10.1016/s0038-1098(02)00629-4

Cited by 11 publications

(8 citation statements)

References 30 publications

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“…The critical temperature at the middle point of the transition is T c 87 K at zero applied field. The behaviour of sample resistivity against temperature at finite fields agrees with previously reported data on the same material [34]. The high temperature resistance step clearly visible at an applied field of 2 T can be explained within a model of weakly coupled superconducting layers, where the motion of distorted vortices causes an excess dissipation [44].…”

Section: Transport Propertiessupporting

confidence: 88%

“…The averaged values over the sample surface show a ratio of Bi/Sr/Ca/Cu elements 2/1.7/0.8/2.2 with an error of ±0.2. The values agree with published characterizations on similar crystals [33,34]. Note that the carbon peak seen in the spectrum derives from tape on which the crystal was glued and it is not an impurity of the sample.…”

Section: Sample Processing and Structural Characterizationsupporting

confidence: 88%

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Magnetization of Bi2Sr2CaCu2O8+δ Micrometer Thin Ring and Its Depinning Line

Semenenko

Camargo

Setzer

et al. 2020

J Supercond Nov Magn

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We demonstrate a geometrical effect on the depinning line (DL) of the flux line lattice of the Bi 2 Sr 2 CaCu 2 O 8+δ high-T c superconductor (HTSC) micrometer ring. The DL shifts to notably lower temperatures in comparison with bulk crystals and thin flakes of the same sample. The shift is attributed to a decrease in the overall pinning potential due to a double size effect, namely (a) the ring thickness ∼ 1 μm being smaller than the pinning correlation length and (b) the increase in the effective London penetration depth of the vortices (Pearl vortices). The large shift of the DL to lower temperatures may influence the suitability of this HTSC for applications in microstrip antennas and THz emitters. Keywords BSCCO • Depinning line • Microstrip antenna • Vortex dynamics • THz emitter 1 Introduction Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) is a high-T c superconductor (HTSC), whose magnetic and superconducting properties are still being investigated [1-9]. In particular, Bi-2212 single crystals are considered to be a key element for THz emitter devices in modern electronics [9-12]. Recently, numerical simulations and analytical calculations classified Bi-2212 micrometer rings as a class of low-loss subwavelength resonators for microstrip antennas and THz B. Semenenko

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Section: Transport Propertiessupporting

confidence: 88%

Section: Sample Processing and Structural Characterizationsupporting

confidence: 88%

Magnetization of Bi2Sr2CaCu2O8+δ Micrometer Thin Ring and Its Depinning Line

Semenenko

Camargo

Setzer

et al. 2020

J Supercond Nov Magn

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“…Nonlocal effects as a consequence of vortex interaction were observed in Corbino disks 5,6 and in superconducting strips. 7 There is plenty of theoretical work devoted to the study of the rectify effect in superconducting structures. Various mechanisms leading to rectification were studied.…”

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confidence: 99%

Nonlocal response and surface-barrier-induced rectification in Hall-shaped mesoscopic superconductors

2005

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Nonlocal response in Hall-shaped superconductors is studied using the time-dependent Ginzburg-Landau equations. Applying current in one pair of contacts leads to a voltage drop in another pair of contacts situated at a distance much larger than the coherence length. This effect is a consequence of the long range correlations in a one-dimensional vortex lattice squeezed in a narrow channel by screening currents. The discrete change in the number of vortices in the channel with applied magnetic field leads to a nonlocal response which is a nonmonotonous function of the magnetic field. For specific configurations of the Hall-shaped superconductor we found a rectifying effect.

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“…In this current in‐and‐out geometry, the “non‐local” voltage is related to the current flowing outside of the electrodes 1–4 regions, that is, in fact, it has a local origin, see, for example, Refs. [28, 29].…”

Section: Resultsmentioning

confidence: 99%

“…In this current in-and-out geometry, the "non-local" voltage is related to the current flowing outside of the electrodes 1-4 regions, that is, in fact, it has a local origin, see, for example, Refs. [28,29]. Outside the region between the electrodes 1-4, the current decays exponentially with the distance x from the lead 4, I(x) = I 0 exp(-x/x 0 ) with x 0 = 0.5 mm.…”

Section: Resistance Measurementsmentioning

confidence: 99%

Global Room‐Temperature Superconductivity in Graphite

Kopelevich,

Torres,

da Silva

et al. 2023

Adv Quantum Tech

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Room temperature superconductivity under normal conditions has been a major challenge of physics and material science since its discovery. Here the global room‐temperature superconductivity observed in cleaved highly oriented pyrolytic graphite carrying dense arrays of nearly parallel surface line defects is reported. The multiterminal measurements performed at the ambient pressure in the temperature interval 4.5 K ≤ T ≤ 300 K and at magnetic fields 0 ≤ B ≤ 9 T applied perpendicular to the basal graphitic planes reveal that the superconducting critical current Ic(T, B) is governed by the normal state resistance RN(T, B) so that Ic(T, B) is proportional to 1/RN(T, B). Magnetization M(T, B) measurements of superconducting screening and hysteresis loops together with the critical current oscillations with temperature that are characteristic for superconductor‐ferromagnet‐superconductor Josephson chains, provide strong support for the occurrence of superconductivity at T > 300 K. A theory of global superconductivity emerging in the array of linear structural defects is developed which well describes the experimental findings and demonstrate that global superconductivity arises as a global phase coherence of superconducting granules in linear defects promoted by the stabilizing effect of underlying Bernal graphite via tunneling coupling to the three dimensional (3D) material.

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Vortex lattice in Bi2Sr2CaCu2O8+δ well above the first-order phase-transition boundary

Cited by 11 publications

References 30 publications

Magnetization of Bi2Sr2CaCu2O8+δ Micrometer Thin Ring and Its Depinning Line

Magnetization of Bi2Sr2CaCu2O8+δ Micrometer Thin Ring and Its Depinning Line

Nonlocal response and surface-barrier-induced rectification in Hall-shaped mesoscopic superconductors

Global Room‐Temperature Superconductivity in Graphite

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