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248 of 250
Endoscopic Aspects of Lesions Secondary to Helicobacter pylori Infection in two Hospitals in Douala: A Cross-Sectional Study over a Three-year Period
Bernard Bertrand Bille EyoumFiacre Servais Bagnaka Eloumou, Christiane Sike Médi, Jethro Roland Misse Ngangue Ekwala, Claudia Laurence Ntonga, Agnes Malongue, Chimi Fotso, Stephane Fotsing, Clementine Kamdem, Roger Gilbert Ateba, Bertrand Claude Mokou, Brigitte Laure Mabeku Kouitcheu and Jules-Roger Kuiate
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Origin of Superconductivity in all Superconductors
Muhammad H El-Saba
Abstract

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General-science Group Research Article Article ID: igmin360

On a Novel Bulk Superconductor: Oxygen-Doped Delafossite Oxide CuYO2,33

Physics DOI10.61927/igmin360
Danijel Djurek *
Affiliation

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    Alessandro Volta Applied Ceramics (AVAC), 49247 Zlatar Bistrica, Augusta Šenoe 14. Croatia

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Abstract

It was shown that delafossite oxide CuY2,33 prepared by solid-state reaction from the pelletized mixture of the nanopowders Y2O3 +2CuO, in air and at firing temperature 809-852 °C, obeys metallic properties. Upon cooling down to +39 °C, the metallic state undergoes a resistive transition, which suggests the first reproducible superconductivity appearing at a temperature higher than that of the ice melting temperature. Klein-Schwinger effect is suggested as a driving mechanism for the creation of electron-hole pairs. Electric properties are interpreted in terms of topological superconductivity.

Figures

DTA and TGA records of the unfired mixture of nano powders Y2O3 + 2CuO. Figure 1: DTA and TGA records of the unfired mixture of nan...
Temperature dependence of the electric resistivity of non-alloyed Y2O3 +2CuO, fired at 818 °C in air, cooled to RT, and subsequently subjected to 5 heating-cooling cycles in air between RT and 635 °C. The width of the transition to the low-resistance state at RT was 8,4 deg. Insets represent: the idealized structure of the delafossite consisting of Cu planes sandwiched between Y-O6 planes, and a pellet pressed together with 100 microns gold wires serving as contacts for four-probe resistance measurement during the heat treatment. Figure 2: Temperature dependence of the electric resistivity...
Temperature dependence of the electric resistivity of no-alloyed CuYO2,33 recorded after the 9th heating-cooling run, ranging from RT- 635 °C. The width of the transition is of the order of 0.1 deg, while the dotted line serves as a guide to the eye. The inset shows the temperature dependence of the AC magnetic susceptibility measured by use of primary and two oppositely connected secondary coils. Oxygen content in the pellet was estimated by its decomposition at 400 °C in a 2 bar H2 atmosphere. The final formula may be expressed as CuYO2+ δ, δ ~0,28–0,36. Figure 3: Temperature dependence of the electric resistivity...
Temperature dependence of the resistance of CuYO2+x fired at 809 °C in air. The heating-cooling process was repeated 10 times in 10 days of the preparation time. Heating up to firing temperature was performed in 2 hours, while cooling lasted 24 hours. Resistance was measured using two DC currents: 5 and 1 mA. Figure 4: Temperature dependence of the resistance of CuYO2+...
Temperature dependence of the electric resistivity of 3 samples CuYO2, 33, which differ by YBa2Cu3O6 alloying levels expressed as w/w percentages: Diagrams show electric resistivity of samples CuYO2, 33: (a) in a single cooling run alloyed 2%, (b) in the single cooling run alloyed 5%, (c) electric resistivities of the 10% alloyed sample measured by three different currents and current I = 10 µA in a magnetic field 1, 15 Tesla. All measured resistivities are normalized at + 39 °C. Insets of diagrams present: (a) temperature dependence of the AC magnetic susceptibility of the sample presented in diagram (c), (b) the possible Cu-O chain structure stretched along the crystallographic b-axis. Figure 5: Temperature dependence of the electric resistivity...

References

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