Neutron diffraction study of superconducting RESr2Cu3−xMxOz (M = Re, W)

Sequiera, A. ; Rajagopal, H. ; Murugesan, M. ; Rao, M. S. R. ; Gupta, L. C. ; Pinto, R. ; Sharon, M. ; Vijayaraghavan, R. (1996) Neutron diffraction study of superconducting RESr2Cu3−xMxOz (M = Re, W) Physica B: Condensed Matter, 223-224 . pp. 574-576. ISSN 0921-4526

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Superconductivity has recently been reported in RESr2Cu2.85Re0.15Oz (RE = Y, Tb, Dy, Ho, Er and Tm) and RESr2Cu2.80W0.20Oz (RE = Y, Dy, Ho and Er) with Tc ranging from 22 to 41 K. Room temperature powder neutron diffraction studies have been carried out for obtaining structural parameters and their relation with superconductivity in these materials. Reitveld refinements were carried out adopting the space groups P4/mmm (tetragonal). Occupancy of the rare earths is less than 1 indicating vacancy at the rare earth sites. Cu(2)-O distance in RESr2Cu3−xMxOz (M = Re and W) is smaller than that of REBa2Cu3O7−δ which is consistent with the smaller ionic radius of Sr2+. Our studies show that the M-cations (Re or W) occupy the Cu(1) chain site.

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ID Code:61916
Deposited On:15 Sep 2011 12:01
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