Surface Wave Plasma Production Employing High-Permittivity Material for Microwave Window

Abstract

We report a detailed quantum oscillation study of the overdoped cuprate Tl 2 Ba 2 CuO 6+δ at two different doping levels (T c = 10 and 26 K). The derived Fermi surface size and topology complement earlier angle-dependent magnetoresistance studies and confirm the existence of a large quasi-cylindrical hole-doped Fermi surface with a small, but finite, c-axis warping. An accurate determination of the hole concentration reveals that superconductivity in Tl 2 Ba 2 CuO 6+δ does not follow the universal T c ( p) parabola for cuprate families and survives up to a larger doping of p c = 0.31. The observation of quantum oscillations for both dopings demonstrates that Fermi liquid behaviour is not confined to the edge of the superconducting dome, but is robust up to at least 0.3T max c . Moreover, the observation of such well-resolved oscillations implies that the physical properties of overdoped Tl 2 Ba 2 CuO 6+δ are determined by a single, spatially homogeneous electronic ground state. Finally, analysis of the different quasiparticle masses points towards a purely magnetic or electronic pairing mechanism.

Investigation of spatial profile control of electron density in the rectangular‐type surface wave plasma apparatus with multiple dielectric windows

“…In this device, plasma with nonuniformity of ion saturation current at probe measurements below ±3% was confirmed as generated across a diameter of 30 cm. In addition, in place of a multislot antenna, various other large-surface-area plasma devices [8][9][10][11][12] are being developed, including a plasma source that is equipped with a horn antenna through which microwaves are injected via a large-surface-area window set up in the upper portion of a vacuum chamber and then generates plasma [4,5], and a surface wave device that uses a large-surface-area rectangular parallelepiped chamber 1000 mm by 1000 mm with a slot antenna [6,7].…”