Device For Introduction of Solid Reagents

Abstract

In a series of pyrolysis experiments recently carried out in this laboratory it was necessary to introduce a solid charge at a slow, constant rate into a tube furnace for periods up to 8 hours. This was accomplished with the device described here.

Off-Diagonal Nonmagnetic Disorder in s- and d-Wave Superconductors

“…Strong off-diagonal disorder effectively suppresses the d-wave superconductivity and only slightly the s-wave one in agreement with Anderson's "theorem" [3]. The interesting result is the existence of the critical concentration x cr of superconducting element in non-metallic host which makes the system superconducting (x cr ≈ 0.4).…”

“…On experimental side it started with early work of Shalnikov [1], Buckel [2], and others, while theoretical ideas have been developed by Anderson [3], Abrikosov and Gorkov [4,5] and many others [6][7][8][9][10]. Nowadays the reaction of superconductors against the impurities intentionally introduced into them is the first indication of the non s-wave symmetry of the order parameter.…”