Effect on superconducting properties

We will not cover the optical properties of superconducting A3C60 salts, either, both because the theoretical implications of the Jahn-Teller effect on superconductivity has been extensively discussed [32] and because experimental spectra in these compounds concentrate on electronic effects [33] and vibrational spectra have not been discussed in detail, partly because of the interference with the background of free electrons. 

The effect of hydrogen absorption on superconductive properties was studied on relatively few compounds. These comprise ThyFej (Malik et al., 1978a), CeCo2 (Buschow and Sherwood, 1978), several La-Ni compounds (Oesterreicher et al., 1976) and several Th-R alloys (Oesterreicher et al., 1977). In all cases it was found that the absorption of hydrogen gas leads to disappearance or lowering of the superconducting state. 

There are presently four famihes of high-temperature superconductors under investigation for practical magnet appheations. Table 11-25 shows that all HTS are copper oxide ceramics even though the oxygen content may vary. However, this variation generally has little effect on the phvsical properties of importance to superconductivity. 

Tajima N, Ebina-Tajima A, Tamura M, Nishio Y, Kajita K (2002) Effects of uniaxial strain on transport properties of organic conductor a-(BEDT-TTF)2l3 and discovery of superconductivity. J Phys Soc Jpn 71 1832-1835... 

Hidaka, Y., Suzuki, M., Murakami, T. and Inamura, T., Effects of a Lead Oxide Annealing Atmosphere on the Superconducting Properties of BaPb1 xBixOs Sputtered Films. Thin Solid Films 106 311 (1983). 

The electrical properties of insulators for superconducting magnets are of crucial importance in relation to the operational reliability of fusion reactors [81], In the present section, the characteristics in original electrical properties of polymers at cryogenic temperatures are briefly introduced and then the effects of radiation on these properties are surveyed. 

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