Aging effect in CaLaBa{Cu<inf>1 - x</inf>Fe<inf>x</inf>}<inf>3</inf>O<inf>7 - δ</inf> with 0 ≤ x ≤ 0.07 studied by Mössbauer spectroscopy

Angel Bustamante, Luis de Los Santos Valladares, Jesús Flores, Crispin H.W. Barnes, Yutaka Majima

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Abstract

In this work, we study the long-term aging effect caused by Fe atoms in the superconductor CaLaBa{Cu1 - xFex}3O7 - δ with 0 ≤ x ≤ 0.07. XRD confirms that this system has a YBCO-like structure. The critical temperature (Tc) is strongly affected by aging and depends on the amount of Fe in the structure. Room temperature Mössbauer 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 Sz = 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 Sz = 3/2 in all these cases). Aging causes loss of superconductivity in the samples with 5 and 7% of iron content. © 2011 Springer Science+Business Media B.V.
Original languageAmerican English
Pages (from-to)119-124
Number of pages6
JournalHyperfine Interactions
DOIs
StatePublished - 1 Nov 2011

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