Coexistence of superconductivity and magnetic order in YBa2Cu4O8

I. Felner*, I. Nowik, E. R. Bauminger, U. Yaron, D. Hechel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

57Fe Mössbauer spectroscopy, magnetic susceptibility and powder x-ray-diffraction measurements were used to study superconductivity and magnetic order in YBa2(Cu1-xFex)4O8+δ. Tc is decreasing with x, disappearing for x>xc≈0.04. For x<xc iron substitutes Cu, predominantly in the Cu(1) site exhibiting a single quadrupole Mössbauer spectrum at 90 K. For x>xc magnetic order is observed in the Cu(2) site, TN=380 (5) K for x=0.1 and Heff (Cu(2), 4.2 K)=510(2) kOe. However, the most surprising discovery is that for x=0.025, for which Tc=27(2) K, the Fe in the Cu(1) site orders magnetically at TN=30(2) K and Heff (Cu(1), 4.2 K)=461(2) kOe. The coexistence and competition between superconductivity and magnetic order in the Cu(1) and Cu(2) sites in YBa2Cu4O8 are discussed in terms of the previously observed phase diagrams for Y1-xPrxBa2(Cu1-yFey)3Oz.

Original languageEnglish
Pages (from-to)1163-1166
Number of pages4
JournalHyperfine Interactions
Volume70
Issue number1-4
DOIs
StatePublished - Apr 1992

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