TY - JOUR
T1 - Superconductivity in the LnBaCuO system (Ln = Y, Ho, Er)
AU - Hayri, E. A.
AU - Ramanujachary, K. V.
AU - Li, S.
AU - Greenblatt, M.
AU - Simizu, S.
AU - Friedberg, S. A.
N1 - Funding Information:
We thank the Ceramics Department at Rutgers University for the use of their Siemens dlffractometer and Dr. Lois Johnson who did the measurements. Useful discussions with Profs. Peter Lindenfeld and William McLean at the Rutgers Physics Department are acknowledged. Magnetic susceptibility data was measured by Shahid Shaheen by the Faraday method at New York University, Physics Department. Use of the Faraday magnetometer of Professor S. Horn is acknowledged. Professor William McCarroll at Rider College helped analyze the X-ray data. This research received partial support from the Office of Naval Research, National Science Foundation-Solid State Chemistry Program, Grant DMR84-04003, and National Science Foundation-Materials Research Instrument Grant DMR84-08266. Magnetic susceptibility studies at Carnegle-Mellon University were carried out with support provided by National Science Foundation Grant DMR84-05833.
PY - 1987/10
Y1 - 1987/10
N2 - Superconductivity around 90K is observed in mixed and single phase system of LnBaCuO (Ln = Y, Ho, Er). Resistivity, X-ray powder diffraction and AC susceptibility measurements were carried out on samples of the mixed phase systems Ln2-xBaxCuO4-y (Ln = Ho, Er), Y1.2Ba0.8Cu1+xO4+x-y(02LnCu3O7 (Ln = Y, Ho, Er). Ln2-xBaxCuO4-y consists of Ba2LnCu3O7, BaCuLn2O5, Cu2Ln2O5 and starting materials and shows a small diamagnetic signal below Tc in the temperature dependent AC susceptibility. Y1.2Ba0.8Cu1+xO4+x-y is a mixture of Ba2YCu3O7, BaCuY2O5 and CuO and also indicates a small diamagnetic signal at 92K. Interesting resistivity anomalies occur in the Y1.2Ba0.8Cu4O7-y and Ho0.8Ba1.2CuO4-y composites including large drops in the resistivity at ∼220 and ∼120K, respectively. The pure compounds, Ba2LnCu3O7 (Ln = Y, Ho, Er) show sharp resistive superconducting transitions and bulk Meissner effects of 90%.
AB - Superconductivity around 90K is observed in mixed and single phase system of LnBaCuO (Ln = Y, Ho, Er). Resistivity, X-ray powder diffraction and AC susceptibility measurements were carried out on samples of the mixed phase systems Ln2-xBaxCuO4-y (Ln = Ho, Er), Y1.2Ba0.8Cu1+xO4+x-y(02LnCu3O7 (Ln = Y, Ho, Er). Ln2-xBaxCuO4-y consists of Ba2LnCu3O7, BaCuLn2O5, Cu2Ln2O5 and starting materials and shows a small diamagnetic signal below Tc in the temperature dependent AC susceptibility. Y1.2Ba0.8Cu1+xO4+x-y is a mixture of Ba2YCu3O7, BaCuY2O5 and CuO and also indicates a small diamagnetic signal at 92K. Interesting resistivity anomalies occur in the Y1.2Ba0.8Cu4O7-y and Ho0.8Ba1.2CuO4-y composites including large drops in the resistivity at ∼220 and ∼120K, respectively. The pure compounds, Ba2LnCu3O7 (Ln = Y, Ho, Er) show sharp resistive superconducting transitions and bulk Meissner effects of 90%.
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U2 - 10.1016/0038-1098(87)91158-6
DO - 10.1016/0038-1098(87)91158-6
M3 - Article
AN - SCOPUS:0023439240
SN - 0038-1098
VL - 64
SP - 217
EP - 226
JO - Solid State Communications
JF - Solid State Communications
IS - 2
ER -