Neutron diffraction and thermopower of Y1−xPrxSr2Cu2.8Re0.2O6+z (x=0 and 0.60)

Taylor, C.R.; Das, Arijit; Greaves, C.; Zelenay, I.; Suryanarayanan, R.

doi:10.1016/0921-4534(96)00204-3

Cited by 7 publications

(1 citation statement)

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“…[11][12][13][14] Although a large number of articles have appeared on the YPrBCO system, only a few reports are available on the Y 1Ϫx Pr x Sr 2 Cu 3Ϫy M y O 7ϩ␦ series. [15][16][17][18][19][20] In view of the importance and the interest on the understanding of the T c depression mechanism, in particular the detrimental effect of Pr on T c , we have undertaken the present study. Moreover, this is also an attempt to stabilize these metastable Sr-based 123 phases by Re, viz 3 , CuO, and ReO 3 .…”

Section: Introductionmentioning

confidence: 99%

Oxidation state and superconducting properties of Y1−xPrxSr2Cu2.85Re0.15O7+δ

Murugesan

Selvam

Sharon

et al. 1996

Journal of Applied Physics

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Superconductivity exists in orthorhombic Y1−xPrxSr2Cu2.85Re0.15O7+δ up to a critical concentration (xcr) of 0.65. A progressive decrease in Tc occurs as x increases from 0 to 0.65. A further increase in x leads to a tetragonal transformation and as a consequence the Tc vanishes; however, the orthorhombicity of these Sr-based compounds is much lower than that observed for the Ba analog, Y1−xPrxBa2Cu3O7−δ and, hence, the Tc. On the one hand, crystal chemistry correlations indicate that the Pr ion is in trivalent state while on the other hand, the stabilizing cation, viz., Re, is in hexavalent state which accounts for the excess oxygen (>7.0) in the system. The high xcr value of the Sr series compared to the Ba series (xcr=0.55) is attributed to the much reduced orbital overlap of the trivalent Pr(4f ) state with the Cu(3dx2−y2)–O(2p) conduction band, via hole localization and/or pair breaking, and is not due to the much discussed hole filling by tetravalent Pr.

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