High-temperature superconductivity

About: High-temperature superconductivity is a research topic. Over the lifetime, 7263 publications have been published within this topic receiving 175377 citations. The topic is also known as: high-temperature superconductivity.

AC Inductive Measurement of Intergrain and Intragrain Currents in High-Tc Oxide Superconductors

Abstract: Bulk intergrain current and closed intragrain current in sintered Y-Ba-Cu-O superconductors were measured at 77 K by using an ac inductive method. These currents can be separated because of the large difference in penetrating rates of the magnetic flux into specimens with respect to the ac field amplitude. The obtained intergrain current density agreed approximately with critical current density measured resistively. The closed intragrain current density amounted to 4.3×108 A/m2 at B=0.5 T and decreased gradually with increasing magnetic field. The present results show that the ac inductive measurement is one of the available nondestructive methods to characterize sintered oxide specimens.

Toward Superconducting Critical Current by Design.

Abstract: A new critical-current-by-design paradigm is presented. It aims at predicting the optimal defect landscape in superconductors for targeted applications by elucidating the vortex dynamics responsible for the bulk critical current. To this end, critical current measurements on commercial high-temperature superconductors are combined with large-scale time-dependent Ginzburg-Landau simulations of vortex dynamics.

High-temperature superconductivity in LaBaCaCu3O6.85

Abstract: A new superconducting compound with composition LaBaCaCu3O6.85 has been prepared. It crystallizes in a pseudo-tetragonal structure related to YBa2Cu3O7. The onset superconducting temperature is 78 K. Electron diffraction clearly shows the presence of a superstructure in this material. Conductivity and superconductivity data are presented and possible structures of the unit cell are discussed.

Plasma assisted oxidation of perovskites for forming high temperature superconductors using inductively coupled discharges

Abstract: A process is described for the formation of high temperature superconducting materials from perovskites by inductively coupled plasma assisted oxidation. An inductively coupled plasma reactor is used to oxidize oxygen deficient perovskites in less time and at lower temperatures than previously possible. High power densities are created within the plasma reactor. This is thought to contribute to the rapid and low temperature phase change during oxidation from tetragonal to orthorhombic crystal structure apparently required for superconductivity at temperatures greater than approximately 77° K. The low temperature and rapid processing time permits the application of conventional lithographic semiconductor manufacturing techniques to be applied to the potentially high temperature superconducting perovskite materials.

Superconductivity of lithium-doped hydrogen under high pressure

Abstract: The high-pressure lattice dynamics and superconductivity of newly proposed lithium hydrides (LiH2, LiH6 and LiH8) have been extensively studied using density functional theory. The application of the Allen–Dynes modified McMillan equation and electron–phonon coupling calculations show that LiH6 and LiH8 are superconductors with critical temperatures (Tc) of 38 K at 150 GPa for LiH6 and 31 K at 100 GPa for LiH8, while LiH2 is not a superconductor. The Tc of LiH6 increases rapidly with pressure and reaches 82 K at 300 GPa due to enhancement of the electron–phonon coupling and the increased density of states at the Fermi level, while the Tc of LiH8 remains almost constant.