Superconducting grain

Nitrate solutions are also suitable for aerosol flow production of fine powders (50)(51). This technique yields small spherical particles that should be suitable for good sintering. However, because of the resulting small size of the superconducting grains, ceramics may have very poor flux expulsion properties if they are not thoroughly sintered (50). 

Quantum Tunneling between Paramagnetic and Superconducting States of a Nanometer-Scale Superconducting Grain Placed in a Magnetic Field... 

Fig. 1. Schematic picture of a platelet superconducting grain (gray) and two metallic plates separated by the insulating layers (black). The state of the grain can be controlled by measuring the conductance of the grain.

An isolated superconducting grain can be be described by the reduced BCS Hamiltonian with the Zeeman coupling to the magnetic field... 

The energy of the superconducting grain in the mean field approximation is given by... 

K in the Tl-2134 system [179], and 150 K under pressure in the Hg-1223 system [180]. Applications are at present limited by low values of the critical current j,., but efforts underway try to overcome this limitation by better processing and increase of contact between superconducting grains. 

The superconducting grain boundary shown in Figs 10.4(c) and (d) is atomically very well structured and also basically consists of only one type of... 

Figure 9.7. Abnormally grown Y(Dy)Ba2Cu30x superconducting grains observed after heat treating a sintered YBa2Cu30x specimen packed in DyBa2Cu30x at 950°C for 20 h in O2. ...

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