Using the high-resolution Bitter-pattern technique, we have studied the vortex structure in crystals of the high-TV superconductor, YBa2Cu3C>7, for fields parallel to the c axis. We describe the vortex pinning by twin boundaries and show that a vortex lattice develops in twin-free regions. But the results also show directly that vortices are pinned at low temperatures even in crystals which are essentially defect free. We believe this pinning must be intrinsic to the new superconductors.
The infrared spectra of rare earth acetates have been studied to examine the metal-acetate bonding. The thermal decomposition of rare earth acetates as well as lead and copper acetates have been investigated in detail by employing thermogravimetric analysis and differential thermal analysis. Thermal decomposition of calcium dicarboxylates (malonate to sebacate) have been studied employing t.g.a. and d.t.a. Infrared spectra of the dicarboxylates have also been studied. Preliminary results on the products of decomposition of dicarboxylates have been reported.
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