Magnetic field-dependent study of excess conductivity and pseudogap state of single grain GdBa$$_{\varvec{2}}$$Cu$$_{\varvec{3}}$$O$$_{\varvec{7-\delta }}$$ superconductor

Shit, Subhasis; Namburi, Devendra Kumar; Das, S. D.; Nath, T. K.

doi:10.1007/s00339-022-05597-8

Cited by 4 publications

(5 citation statements)

References 53 publications

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“…In our case, when the magnetic field increases, the coupling strength in the product diminishes, meaning that ξ c (0) drops as the magnetic field rises. Similar behavior has been recently reported by Subhasis Shit et al in single grain GdBa 2 Cu 3 O 7−δ superconductor [53]. Our results are also consistent with those reported by Solovjov et al in the case of YBCO single crystals prepared at different pressures [54].…”

Section: Excess Conductivitysupporting

confidence: 93%

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Slimani,

Hannachi,

Koblischka-Veneva

et al. 2024

Materials

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Struts of a superconducting YBa2Cu3Oy (YBCO) foam prepared by the infiltration growth method on the base of commercial polyurethane foams were extracted from the bulk, and thoroughly characterized concerning the microstructure and the magnetoresistance, measured by the four-point technique. Optical microscopy, electron microscopy, electron backscatter diffraction and atomic force microscopy observations indicate a unique microstructure of the foam struts which shows a large amount of tiny Y2BaCuO5 (Y-211) particles (with diameters between 50 and 100 nm) being enclosed in channel-like grain boundaries between the YBCO grains and a one-of-a-kind surface of the struts covered with Ba3Cu5Oy-particles. The resistance data obtained at temperatures in the range 4.2 K ≤T≤ 150 K (applied magnetic fields ranging from 0 to 7 T) were analyzed in the framework of the fluctuation-induced conductivity (FIC) approach using the models of Aslamazov–Larkin (AL) and Lawrence–Doniach (LD). The resulting FIC curves reveal the presence of five distinct fluctuation regimes, namely, the short-wave (SWF), one-dimensional (1D), two-dimensional (2D), three-dimensional (3D), and critical (CR) fluctuation domains. The analysis of the FIC data enable the coherence length in the direction of the c-axis at zero-temperature (ξc(0)), the irreversibility field (Birr), the upper critical magnetic field (Bc2), the critical current density at T= 0 K (Jc(0)) and several other parameters describing the the material’s superconducting properties to be determined. The present data reveal that the minuscule Y-211 particles found along the YBCO grain boundaries alter the excess conductivity and the fluctuation behavior as compared to conventional YBCO samples, leading to a quite high value for Jc(0) for a sample with a non-optimized pinning landscape.

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Section: Excess Conductivitysupporting

confidence: 93%

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Slimani,

Hannachi,

Koblischka-Veneva

et al. 2024

Materials

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“…This behavior is consistent with that ξ c (0) follows a proportional relationship with T c which goes against the general theory of superconductivity [48] (where ξ c (0) ∼ 1/T c ). Similar behavior has been recently reported by Subhasis Shit et al in single grain GdBa 2 Cu 3 O 7−δ superconductor [49]. In addition, as can be observed from Figure 5, both ξ c (0) and d diminished with an almost similar rate with the applied magnetic field.…”

Section: Excess Conductivitysupporting

confidence: 89%

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Slimani,

Hannachi,

Koblischka-Veneva

et al. 2024

Preprint

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Struts of a superconducting YBa2Cu3Oy (YBCO) foam prepared by the infiltration growth method on the base of commercial polyurethane foams were extracted from the bulk, and thoroughly characterized concerning the microstructure and the magnetoresistance, measured by the four-point technique. Optical microscopy, electron microscopy, electron backscatter diffraction and atomic force microscopy observations indicate an unique microstructure of the foam struts which shows a large amount of tiny Y2BaCuO5 (Y-211) particles (with diameters between 50–100 nm) being enclosed in channel-like grain boundaries between the YBCO grains and an one-of-a-kind surface of the struts covered with Ba3Cu5Oy-particles. The resistance data obtained at temperatures in the range 4.2 K ≤T≤ 150 K (applied magnetic fields ranging from 0 to 7 T) were analyzed in the framework of the fluctuation-induced conductivity (FIC) approach using the Aslamazov-Larkin model. The resulting FIC curves reveal the presence of five distinct fluctuation regimes, namely, the short-wave (SWF), one-dimensional (1D), two-dimensional (2D), three-dimensional (3D), and critical (CR) fluctuation domains. The analysis of the FIC data enable the coherence length in the direction of the c-axis at zero-temperature (ξc(0)), the lower and upper critical magnetic fields (Bc1, Bc2), the critical current density at T= 0 K (Jc(0)) and several other parameters describing the the material’s superconducting properties to be determined. The present data reveal that the minuscule Y-211 particles found along the YBCO grain boundaries alter the excess conductivity and the fluctuation behavior as compared to conventional YBCO samples, leading to a quite high value for Jc(0) for a sample without added flux pinning centers.

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“…Our previous study on the GdBCO superconductor extensively investigated temperature-dependent electrical resistivity measurements under various magnetic field conditions [24]. One notable finding from our research is that the onset temperature of superconductivity in the sample, denoted as T c onset , remains nearly constant regardless of the applied magnetic field.…”

Section: Electrical Transport Propertiesmentioning

confidence: 77%

“…In our earlier publication [24], it has been reported a tilted nature in the magnetic hysteresis loop of GdBCO system compared to YBCO superconductor. Thus this paper focuses on evaluating the influence of the magnetic moment of Gd 3+ ions on the superconducting properties of the GdBCO sample.…”

Section: Introductionmentioning

confidence: 86%

“…In our study, we had taken a circular disk-type GdBCO sample with a diameter of 25 mm and a thickness of 11.55 mm. The sample was highly oriented along a specific direction (00l) as described in our previous report [24]. The electronic state of the elements within the sample was analyzed using x-ray photoelectron spectroscopy (XPS), specifically employing the PHI 5000 Versa Probe III, USA scanning instrument with monochromatic Al x-ray source having focused beam <10 μm to 300 μm.…”

Section: Methodsmentioning

confidence: 99%

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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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Magnetic field-dependent study of excess conductivity and pseudogap state of single grain GdBa$$_{\varvec{2}}$$Cu$$_{\varvec{3}}$$O$$_{\varvec{7-\delta }}$$ superconductor

Cited by 4 publications

References 53 publications

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

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

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Magnetic field-dependent study of excess conductivity and pseudogap state of single grain GdBa$$_{\varvec{2}}$$Cu$$_{\varvec{3}}$$O$$_{\varvec{7-\delta }}$$ superconductor

Cited by 4 publications

References 53 publications

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

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