Aging effect in CaLaBa{Cu1-xFex}3O7-δ with 0 ≤ x ≤ 0.07 studied by Mossbauer spectroscopy

被引：3

作者：

Bustamante, Angel ^{[1
]}

Valladares, Luis De Los Santos ^{[2
,3
]}

Flores, Jess ^{[1
]}

Barnes, Crispin H. W. ^{[2
]}

Majima, Yutaka ^{[3
,4
]}

机构：

[1] Univ Nacl Mayor San Marcos, Fac Ciencias Fis, Lab Ceram & Nanomat, Lima 14, Peru

[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[3] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[4] Japan Sci & Technol Agcy JST, CREST, Yokohama, Kanagawa 2268503, Japan

来源：

HYPERFINE INTERACTIONS | 2011年 / 203卷 / 1-3期

关键词：

Mossbauer spectroscopy; Cuprates; Aging effect; Spatial group P4/mmm; SUPERCONDUCTOR;

D O I：

10.1007/s10751-011-0371-z

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

In this work, we study the long-term aging effect caused by Fe atoms in the superconductor CaLaBa{Cu1-xFex}(3)O7-delta with 0 <= x <= 0.07. XRD confirms that this system has a YBCO-like structure. The critical temperature (T-c) is strongly affected by aging and depends on the amount of Fe in the structure. Room temperature Mossbauer spectroscopy reveals the presence of the typical species A, B-B', C and new species E' and F. Interestingly; A, which corresponds to the Fe3+ atom located in the Cu(1) of the chains with spin S-z = 3/2, shows a drastic reduction which means migration to the species B, B' and C. Species B and B' correspond to the Fe3+ in the Cu(2) site forming planar quasi-octahedral and planar square pyramidal, while the C specie is a square pyramidal with O(5) respectively (spin S-z = 3/2 in all these cases). Aging causes loss of superconductivity in the samples with 5 and 7% of iron content.

引用

页码：119 / 124

页数：6

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