TY - JOUR
T1 - Coexistence of superconductivity and magnetic order in YBa2Cu4O8
AU - Felner, I.
AU - Nowik, I.
AU - Bauminger, E. R.
AU - Yaron, U.
AU - Hechel, D.
PY - 1992/4
Y1 - 1992/4
N2 - 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 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.
AB - 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 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.
UR - http://www.scopus.com/inward/record.url?scp=34249837118&partnerID=8YFLogxK
U2 - 10.1007/BF02397536
DO - 10.1007/BF02397536
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AN - SCOPUS:34249837118
SN - 0304-3843
VL - 70
SP - 1163
EP - 1166
JO - Hyperfine Interactions
JF - Hyperfine Interactions
IS - 1-4
ER -