Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/1234
Title: Evidence for two distinct orthorhombic structures associated with different Tc regimes in LnBa2Cu3O7 − δ (Ln = Nd, Eu, Gd and Dy): A study of the dependence of superconductivity on oxygen stoichiometry
Authors: Nagarajan, R
Vijayaraghavan, R
Ganapathi, L
Ram, Ram
Rao, C N R
Keywords: oxygen stoichiometry
Superconductivity
Orthorhombic structure
Issue Date: 1-May-1989
Publisher: Elsevier Science BV
Citation: Physica C 158(3), 453-457 (1989)
Abstract: Superconductivity in LnBa2Cu3O7 − δ with Ln = Nd, Eu, Gdand Dy has been investigated as a function of δ, closely following the accompanying changes in crystal structure. Orthorhombic GdBa2Cu3O7 − δ and DyBa2Cu3O7 − δ show a Tc of ≈ 90 K up to δ = 0.2 and a lower Tc plateau (40–50 K) in the δ range 02 to 0.4, similar to that found in YBa2Cu3O7 − δ. The orthorhombic structure II in the lower Tc regions is different from the structure I in the 90 K Tc (low δ) region. The unit cell parameters of the orthorhombic I structure in the high Tc region bear the relationship of a a ≠ b not, vert, similar c/3. This relationship is not seen in the low Tc plateau. The low Tc plateau region does not distinctly manifest itself in NdBa2Cu3O7 − δ just as in LaBa2Cu3O7 − δ.
Description: Restricted Access
URI: http://hdl.handle.net/10572/1234
Other Identifiers: 0921-4534
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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