Vortex liquid properties in optimally doped and oxygen-deficient YBa2Cu3O7−δ single crystals

Andersson, Magnus; Eltsev, Yu.; Lundqvist, Björn; Rydh, Andreas; Rapp, Ö.

doi:10.1016/s0921-4534(99)00649-8

Cited by 4 publications

(5 citation statements)

References 25 publications

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“…However, the critical region between T g and T* can be identified clearly. A similar scaling approach by Andersson et al [25] with temperature scale [T(T c -T g )/T g (T c -T)]-1 also does not lead to scaling for this sample and, furthermore, does not resolve the critical region correctly. The latter scaling approach has nonetheless been successfully applied to Ba122 single crystals [26] and (Li 1−x Fe x OH)FeSe [27].…”

Section: Resultsmentioning

confidence: 70%

“…All of the above critics come to the conclusion that scaling alone is not sufficient evidence for the presence of a vortex phase transition. Other authors on the contrary conclude that a glass-liquid transition and thermal activation of flux motion do simply not necessarily have to exclude each other [24], [25], see above. The group of Matsushita, e.g.…”

Section: Resultsmentioning

confidence: 97%

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Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film

et al. 2018

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An epitaxial NdFeAs(O,F) thin film of 90 nm thickness grown by molecular beam epitaxy on MgO single crystal with T c = 44.2 K has been investigated regarding a possible vortex glass-liquid transition. The voltage-current characteristics show excellent scalability according to the vortexglass model with a static critical exponent ν of around 1.35 and a temperature-dependent dynamic exponent z increasing from 7.8 to 9.0 for the investigated temperature range. The large and non-constant z values are discussed in the frame of 3D vortex glass, thermally activated flux motion, and inhomogeneity broadening.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 97%

Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film

et al. 2018

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“…Furthermore, according to the modified vortex-glass model, the normalized resistivity can be rewritten as ρ ρ n = true[ T ( T c − T g ) T normalg ( T c − T ) − 1 true] s Here T c values were taken as onset of resistive transition in magnetic fields, and T g values were taken from Figure b. Thus, according to eq , all the curves of normalized resistivity in different magnetic fields should scale to one curve in ρ/ρ 0 vs T scale coordinates ( T scale is [ T ( T c – T g )/ T g ( T c – T ) – 1] and ρ 0 is the resistivity in the normal state).…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, according to the modified vortex-glass model, 40 the normalized resistivity can be rewritten as…”

mentioning

confidence: 99%

Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures

Sadakov

Власенко

Troyan

et al. 2023

J. Phys. Chem. Lett.

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A comprehensive study of vortex phases and vortex dynamics is presented for a recently discovered high-temperature superconductor YH6 with T c(onset) of 215 K under a pressure of 200 GPa. The thermal activation energy (U 0) is derived within the framework of the thermally activated flux flow (TAFF) theory. The activation energy yields a power law dependence U 0 ∝ H α on magnetic field with a possible crossover at a field around 8–10 T. Furthermore, we have depicted the vortex phase transition from the vortex-glass to vortex-liquid state according to the vortex-glass theory. Finally, vortex phase diagram is constructed for the first time for superhydrides. Very high estimated values of flux flow barriers U 0(H) = (1.5–7) × 104 K together with high crossover fields make YH6 a rather outstanding superconductor as compared to most cuprates and iron-based systems. The Ginzburg number for YH6 Gi = (3–7) × 10–3 indicates that thermal fluctuations are not so strong and cannot broaden superconducting transitions in weak magnetic fields.

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“…In contrast, for disordered systems, an intermediate state known as the vortex glass phase emerges between the vortex lattice and the vortex liquid phase. Notably, the transformation from the vortex glass phase to the vortex liquid phase assumes a second-order transition [13][14][15]. In addition to considerations regarding critical temperatures (T c ) and critical current densities (J c ), there is a compelling need for a substantial pinning potential (U) and pinning force (F p ), particularly when dealing with high-temperature and high-magnetic-field applications.…”

Section: Introductionmentioning

confidence: 99%

Revelations of vortex phases and pinning mechanism in GdBa₂Cu₃O_7-δ superconductors: a magneto-electric and magnetization study

Shit,

Namburi,

Das

et al. 2024

Phys. Scr.

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Rare earth (RE) and barium (Ba) based cuprate superconductors have garnered considerable attention in both fundamental research and a wide array of engineering and technological applications. Examining the impact of magnetic Gd3+ ions on the GdBa2Cu3O7-δ (GdBCO) system, this study reveals that the presence of Gd3+ ion has tilted the magnetic hysteresis loop, thereby affecting the critical current density (Jc) at low temperatures. Through comprehensive magnetic and magnetotransport data analyses of the GdBCO sample, we have thoroughly explored the intricate behavior of vortices in response to magnetic fields and temperature variations, providing insight into the governing mechanism of vortex pinning. Remarkably, the absolute zero temperature pinning potential (U0) experiences a significant reduction from a very high value of 3.18 eV to 0.45 eV with a magnetic field increase to 40 KOe, following a H^-0:53 law, indicating 3D plastically crippled vortices in weak pinning sites due to point defects. In various technological domains, particularly those involving high temperatures and strong magnetic fields, understanding and optimizing the pinning force (Fp) and the pinning potential (U) of the vortices are pivotal for enhancing performance and efficiency. Consequently, we have meticulously analyzed the nature of Fp and U with the aid of the thermally activated flux flow (TAFF) model. Ultimately, we compiled a comprehensive phase diagram delineating the evolution of various vortex phases.

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Vortex liquid properties in optimally doped and oxygen-deficient YBa2Cu3O7−δ single crystals

Cited by 4 publications

References 25 publications

Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film

Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film

Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures

Revelations of vortex phases and pinning mechanism in GdBa₂Cu₃O_7-δ superconductors: a magneto-electric and magnetization study

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Vortex liquid properties in optimally doped and oxygen-deficient YBa2Cu3O7−δ single crystals

Cited by 4 publications

References 25 publications

Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film

Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film

Vortex Phase Dynamics in Yttrium Superhydride YH6 at Megabar Pressures

Revelations of vortex phases and pinning mechanism in GdBa2Cu3O7-δ superconductors: a magneto-electric and magnetization study

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Product

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Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures

Revelations of vortex phases and pinning mechanism in GdBa₂Cu₃O_7-δ superconductors: a magneto-electric and magnetization study