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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 10, Number 1
BKCSDE 10(1)
January 20, 1989

Title	Studies on the Paramagnetic Impurity Y2BaCuO5 in Superconducting YBa2Cu3O7-δ Phase
Author	Jin-Ho Choy*, Sung-Ho Chun
Keywords
Abstract	Conventional ceramic method has been used to prepare the green phase, Y2BaCuO5, commonly observed in 90-K superconductor YBa2Cu3O7-δ as an impurity phase. The powder X-ray diffraction analysis indicates that Y2BaCuO5 has an orthorhombic symmetry with lattice parameter of a = 12.2 Å, b = 5.61 Å, and c = 7.14 Å. The average g-value 2.13 observed in ESR spectrum is attributable to Cu2+ stabilized in C4v field. From the magnetic susceptibility (μeff = 2.29 BM) and the ESR measurements, it is confirmed that Cu(Ⅱ) 3d9 electrons in Y2BaCuO5 are localized and can be characterized by Curie-Weiss behavior. Optical reflectance spectrum shows a broad absorption peak around 680 nm due to dxy → dx2-y2 eletronic transition.
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