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Electrical transport and superconductivity in YBa2Cu3O7−δ -YBa2HfO5.5 percolation system (1994)

Thomas, J. K. ; Koshy, J. ; Kurian, J. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 76 (1994), S. 2376-2379

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Percolation behavior of the normal state resistivity and superconductivity of YBa2Cu3O7−δ-YBa2HfO5.5 composites has been studied by x-ray diffraction and temperature- resistivity measurements. No detectable chemical reactivity was observed between YBa2Cu3O7−δ and a ceramic insulator YBa2HfO5.5 even when the two materials were mixed thoroughly and sintered at 1020 °C. Normal state and superconducting percolation threshold values are ≈23 vol % of YBa2Cu3O7−δ in the composite. The values obtained for the critical exponents describing the normal state transport behavior of the system matched with theoretically expected values for an ideal conductor-insulator percolation system. The implications are discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.357584

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