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Visible CW (continuous wave) -laser heating effects on the bulksuperconductors CeFeAsO0.65F0.35 and MgB2 with 1.5 mm thickness have beeninvestigated by measuring the temperature dependence of electrical resistivity.Each compound shows a critical-temperature Tc reduction with increasing fluencerate. At the normal state, a parallel circuit model based on the Fourier's lawcan well reproduce the temperature dependence of electrical resistivity ofilluminated sample. On the other hand, the predicted temperature-rise due tothe laser heating in the superconducting state is much smaller than theobserved Tc-reduction. A temperature gradient of a few K across the samplethickness easily triggers the destruction of bulk superconductivity.Furthermore we have found a slight Tc-enhancement in CeFeAsO0.65F0.35 after arather high fluence-rate irradiation.

Illumination effect by visible continuous-wave laser on bulk 40 K-superconductors