Heat Treatment Effects on the Superconductivity and Crystal Structure of Nd1.85Ce0.15CuO4 Studied Using a Single Crystal

Kenji Kurahashi, Hiroki Matsushita, Masaki Fujita, Kazuyoshi Yamada

研究成果: Article査読

41 被引用数 (Scopus)

抄録

We performed systematic post-growth heat treatments on sizable single crystals of Nd1.85Ce0.15CuO4. The superconducting transition temperature, Tc, and its distribution in the sample are both sensitive to details of the heat treatment and sample size. With refinement of the heat treatment conditions we have succeeded in preparing two distinct superconducting samples in which Tc equals 18 K and 25 K under identical Ce-concentrations. Neutron scattering experiments initially observed nonmagnetic super-structure peaks at (π, π) only in the reduced superconducting phase. Atomic displacement in this structure is different from that induced by in-plane rotation of CuO4 squares as previously reported for Gd2-xCexCuO4. A possible relationship between atomic displacements and superconductivity and the role of reduced heat treatments are discussed from the viewpoint of carrier localization.

本文言語English
ページ(範囲)910-915
ページ数6
ジャーナルjournal of the physical society of japan
71
3
DOI
出版ステータスPublished - 2002 3月 1
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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