Abstract:Strongly underdoped NdBa 2 Cu 3 O 6.67 ceramics is known to become superconducting under pressure only. The appearance of superconductivity in the sample originates from the oxygen ordering process, whereas its disappearance, after pressure release, comes from oxygen disordering. The time evolution of the a, b, and c lattice parameters in the relaxation process which occurs after pressure release from 1.3 GPa was studied by x-ray diffraction at two temperatures of 26 and 15°C. The anisotropic expansion of the … Show more
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