The Role of the Short Coherence Length in Unconventional Superconductors

Deutscher, G.

doi:10.3390/condmat5040077

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…It is somewhat similar to the Mott-type metal-insulator transition. 43 A similar explanation was proposed by Kammerer and Strongin in an earlier study. 15 However, due to the lack of the structural analysis, it was not established there.…”

Section: Discussionsupporting

confidence: 78%

“…It is well known that the disordered type superconductors follow the Anderson type transition. 41,42,43 However, in this case the disorder is not homogeneous as the presence of short-range crystallites cannot be ignored. Based on the microstructural analysis, we can instead infer that the granular superconductivity is dominated in the W35 film as compared to only disorder-based transition.…”

Section: Discussionmentioning

confidence: 99%

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Atomic scale microstructural insights of superconducting β-tungsten thin films

Chattaraj

Patidar

Ganesan

et al. 2022

Journal of Materials Research

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Atomic scale microstructural insights of superconducting β-tungsten thin films

Chattaraj

Patidar

Ganesan

et al. 2022

Journal of Materials Research

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“…We note that the coherence length is longer in the ab ‐plane, which confirms that superconductivity is in the ab ‐plane because it also represents the length of the superconducting wave function. Moreover, the shorter the coherence length of a superconductor, the less sensitive it becomes to impurities, [ 46 ] which potentially opens it to industrial applications. For comparison, a conventional superconductor such as niobium has a coherence length of 350 Å.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Hassan

Labrag

Taoufik

et al. 2021

Physica Status Solidi (b)

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At a certain level in the history of superconductivity, it became indispensable to appropriate a microscopic theory that accounts for all the properties that manifest the superconducting materials. In the absence of such a description, we dispose another socalled Ginzburg-Landau (GL) phenomenological theory established in 1950, capable of describing all the properties listed up to now. The basics of this theory rest on the theory of second-order phase transitions founded in 1937 by Lev Landau. The advent of GL theory comes to fill the insufficiency in the London brothers' electrodynamic theory to explain the coexistence of a superconducting phase and a normal phase in a type II superconductor. In addition, it suggests for the first time that the superconducting state is more ordered than the normal state. This is an intuitive thermodynamic theory without a microscopic basis. For this reason, Western scientists did not give it importance. However, the Bardeen-Cooper-Schrieffer theory will come to justify it a posteriori due to the work of Gorkov in 1959 and another version of GL's theory appeared and was called the GLAG theory in honor of these founders Ginzburg, Landau, Abrikosov, and Gorkov. In this new version, the order parameter is directly associated with the Cooper pair wave function. The GL theory is presented in several variants in literature and the intuitive ideas on which they are based seem to be sometimes disconcerting. In contrast, this theory remains very rich because it accounts for the superconductor-normal transition, as well as the thermodynamic, electrodynamic, and quantum effects of the superconducting phase.The theories of V. L. Ginzburg and L. D. Landau highlight two characteristic lengths in the physics of superconductivity [1,2] : 1) The magnetic flux penetration length, known as the London length λ, which defines the length over which magnetic induction can vary in a superconducting material. 2) The coherence length ξ, which represents the spatial dimension of a superconducting pair, i.e., the minimum length over which superconductivity can vary until it disappears. Pairs have reduced dimensions in high-temperature superconductors, where ξ is comparable with the characteristic quantities of the crystal lattice.The quantities λ and ξ diverge for temperatures close to the critical temperature T c . This divergence relates to the weakening of the pairing interaction in the face of thermal agitation and leads to the transition from the superconducting state to the normal state. [3] On the contrary, they allow expressing the critical quantities that delimit the domain of existence of the superconducting state under the effect of an external magnetic field.The variety of behaviors of a superconducting material subjected to an external magnetic field B ¼ μH can be summarized

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“…Extended growth defects, such as edge dislocations, twin planes, and grain boundaries, which depend mainly on the growth mode and stresses arising from the structural growth mismatch between the film and its substrate [19], behave as very efficient pinning centers. The dominant pinning centers in MOCVD films, used in the current experiment, are extended defects in the form of growth spirals with central screw dislocations [17,25] and point defects such as oxygen vacancies in Cu-O2 layers [26,27]. Increasing the concentration of oxygen vacancies in the oxygen-deficient region of the stripe can affect the suppression of superconducting parameters and the increase of a pinning for Abrikosov vortices.…”

Section: Resultsmentioning

confidence: 97%

The Investigation of Vortex Motion in the YBCO Devices Manufactured Utilizing a Gaussian-shaped Optical Spot from a Continuous-wave Laser

Jukna¹

2023

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The current report focuses on the analysis of the investigation results of the Abrikosov vortex motion in the YBa2Cu3O7-d (YBCO) device, which is a c-axis textured 0.3 ´ 50 ´ 100 µm3 (thickness ´ width ´ length) stripe of YBCO superconductor deposited on a LaAlO3 substrate. A laser beam focused in a Gaussian-shape optical spot of 5 mm in diameter modifies the stripe, initiating the oxygen out-diffusion and its uneven distribution in illuminated areas and in this way causing the appearance of a higher level of deoxygenation in the spot center and a lower level at its edges (slopes of weak superconductivity region). At temperatures below the temperature of the superconducting transition Tc, the current-self-produced magnetic field penetrates the optically modified area of the stripe in a form of Abrikosov magnetic vortices, and due to the current-self-produced Lorentz force, the vortices move toward their annihilation line resulting in energy dissipation. The vortices pinned on the slopes experience strong pinning and exert a magnetic drag force on moving vortices, which is confirmed by the stepped current-voltage dependences of the YBCO devices measured at temperatures 0.933·Tc £ T £ 0.958·Tc. Our results demonstrate the advantages of partially deoxygenated YBCO material for the development of superconducting electronic devices with electronic properties controlled by the motion of Abrikosov vortices at temperatures below Tc of the superconductor.

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The Role of the Short Coherence Length in Unconventional Superconductors

Cited by 5 publications

References 16 publications

Atomic scale microstructural insights of superconducting β-tungsten thin films

Atomic scale microstructural insights of superconducting β-tungsten thin films

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

The Investigation of Vortex Motion in the YBCO Devices Manufactured Utilizing a Gaussian-shaped Optical Spot from a Continuous-wave Laser

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The Role of the Short Coherence Length in Unconventional Superconductors

Cited by 5 publications

References 16 publications

Atomic scale microstructural insights of superconducting β-tungsten thin films

Atomic scale microstructural insights of superconducting β-tungsten thin films

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa2Cu3O7−δ

The Investigation of Vortex Motion in the YBCO Devices Manufactured Utilizing a Gaussian-shaped Optical Spot from a Continuous-wave Laser

Contact Info

Product

Resources

About

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ