E. A. Hayri | Researchain

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Solid State Communications | 1987

Superconductivity in the LnBaCuO system (Ln = Y, Ho, Er)

E. A. Hayri; K.V. Ramanujachary; Shen Li; Martha Greenblatt; S. Simizu; S.A. Friedberg

Superconductivity around 90K is observed in mixed and single phase system of LnBaCuO (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(0<x<5) and single phase system Ba2LnCu3O7 (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%.

Physical Review B | 1988

Orthorhombic-to-tetragonal transition in R1+xBa2-xCu3O7+ delta (R=Nd, Sm, and Eu).

S. Li; E. A. Hayri; K.V. Ramanujachary; Martha Greenblatt

Physical Review B | 1987

Low-dimensional magnetism in the high-T/sub c/ superconductor LBa/sub 2/Cu/sub 3/O/sub 7-//sub y/ (L = Gd,Ho,Er): Heat-capacity study

Satoru Simizu; S. A. Friedberg; E. A. Hayri; Martha Greenblatt

Physical Review B | 1987

X-ray absorption measurements on high-Tc superconductors: Cu-valence and cation-bond-length effects.

Y. Jeon; F. Lu; H. Jhans; S. A. Shaheen; Gan Liang; M. Croft; P. H. Ansari; K. V. Ramanujachary; E. A. Hayri; S. M. Fine; Shen Li; X. H. Feng; Martha Greenblatt; L. H. Greene; Jean-Marie Tarascon

Physical Review B | 1988

Orthorhombic-to-tetragonal transition in R_{1+x}Ba_{2-x}Cu_{3}O_{7+d} (R=Nd,Sm,andEu)

Shu Li; E. A. Hayri; Kandalam V. Ramanujachary; Martha Greenblatt

Physical Review B | 1988

Erratum: X-ray absorption measurements on high-Tc superconductors: Cu-valence and cation-bond-length effects (Physical Review B (1988) 38, 10, (7117))

Y. Jeon; F. Lu; H. Jhans; S. A. Shaheen; Gan Liang; M. Croft; P. H. Ansari; K. V. Ramanujachary; E. A. Hayri; S. M. Fine; Shen Li; X. H. Feng; Martha Greenblatt; L. H. Greene; Jean-Marie Tarascon

Physical Review B | 1988

Erratum: X-ray absorption measurements on high-Tc superconductors: Cu-valence and cation-bond-length effects [Phys. Rev. B 36, 3891 (1987]

Yoo-Chan Jeon; F. Q. Guo K. Lu; H. Jhans; S. A. Shaheen; Gan Liang; M. Croft; P. H. Ansari; K. V. Ramanunjachary; E. A. Hayri; S. M. Fine; Shu Li; X. H. Feng; M. Greenblat; L. H. Greene; Jean-Marie Tarascon

Archive | 1988