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YBa2Cu3O7−δ films: Calculation of the thermal conductivity and phonon mean-free path (1992)

Richardson, R. A. ; Peacor, S. D. ; Uher, C. ; [weitere]

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

Journal of Applied Physics 72 (1992), S. 4788-4791

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We estimate the phonon mean-free path (mfp) in YBa2Cu3O7−δ by performing a theoretical fitting procedure on bulk single-crystal data. This analysis indicates that the mfps of the phonons that are most responsible for the transport of heat are much longer than would be predicted from kinetic theory. These values are incorporated into a recently proposed treatment of the size effect to provide an estimate of the thermal conductivity of YBa2Cu3O7−δ films.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.352091

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Digitale Medien

Physical and electromagnetic properties of Y-Ba-Cu-O superconductors synthesized with peroxides (1990)

Peacor, S. D. ; Uher, C. ; Francis, A. H. ; [weitere]

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

Journal of Applied Physics 67 (1990), S. 7488-7492

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The physical and electromagnetic properties of Y-Ba-Cu-O superconductors synthesized with BaO2 (barium peroxide) have been studied. A comparison of reactions with BaCO3 and BaO indicates that the peroxide promotes formation and strong alignment of platelet grains in planes normal to the c axis, yields material with larger grain sizes and aspect ratios, reduces the synthesis reaction time by over half, increases the volume fraction of material that goes superconducting (Meissner effect), and facilitates metallic conduction in the normal state. Critical current densities of 1.1×104 A/cm2 at 77 K have been observed in peroxide-synthesized material. These beneficial effects may be due to the low melting temperature of BaO2 (450 °C), and the elimination of residual unreacted BaCO3, BaO, and/or C.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.345835

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