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IMPLICATIONS OF Gd DESTROYING HIGH-TEMPERATURE SUPERCONDUCTIVITY

JOHN D. DOW

Department of Physics, Arizona State University, Tempe, Arizona 85287, USA

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and

DALE R. HARSHMAN

Department of Physics, Arizona State University, Tempe, Arizona 85287, USA

Physikon Research Corporation, P.O. Box 1014, Lynden, Washington 98264, USA

Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

Permanent address.

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https://doi.org/10.1142/S0217984905008359Cited by:0 (Source: Crossref)

Abstract

The magnetic ion Gd⁺³, having L = 0 and J ≠ 0, is unsplit by crystal fields and, unlike the other trivalent L ≠ 0 rare-earth ions (which are crystal-field split), is a pair-breaker in high-temperature superconductors. Consequently two-layer compounds with Gd (i.e., Gd_2-zCe_zCuO₄ and Ba₂GdRu_1-uCu_uO₆) do not superconduct, but their sister compounds without unsplit and pair-breaking Gd, do superconduct (e.g., Nd_2-zCe_zCuO₄, with crystal-field split Nd, and Sr₂YRu_1-uCu_uO₆, with L = 0 Y, both superconduct). The superconductivity clearly originates in the oxygen of the SrO or BaO layers, or in interstitial oxygen, not in the CuO₂ planes.

Keywords:

PACS: 74.20.-z, 74.60.-w, 74.72.-h

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