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Chemical Signature of the Superconducting Phase in the Nd-Ce-Cu-O System
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Chemical Signature of the Superconducting Phase in the Nd-Ce-Cu-O System
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Journal Article
Chemical Signature of the Superconducting Phase in the Nd-Ce-Cu-O System
1994
Overview
The electron-doped material Nd$_{2-x}$Ce$_x$CuO$_4$ becomes superconducting with a Ce$^{4+}$ composition around 0.16, but only after removal of a minuscule amount of extraneous oxygen. This enigmatic behavior was addressed here. A small fraction of copper in the CuO$_2$ planes of Nd$_{2-x}$Ce$_x$CuO$_4$ was substituted by cobalt-57, which serves as a microprobe of the chemical environment. Deoxygenation brought about little change in the Mossbauer spectra both above and below the optimal superconducting concentration; however, for x = 0.16 a change was observed. In the latter, a major fraction of the magnetically split, five-coordinate species showed itself as a paramagnetically relaxed doublet upon deoxygenation. The abundance of the paramagnetically relaxed species corresponds closely to the diamagnetic volume fraction and thus provides a microscopic signature of the superconducting phase.
Publisher
American Society for the Advancement of Science,American Association for the Advancement of Science
Subject
/ Condensed matter: electronic structure, electrical, magnetic, and optical properties
/ CUPRATES
/ Cuprates superconductors (high tc and insulating parent compounds)
/ Exact sciences and technology
/ Ions
/ Oxygen
/ Physics
/ Properties of type I and type II superconductors
/ Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
/ Sextets
