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  • 1
    Electronic Resource
    Electronic Resource
    δ-Influence on the pressure-effect on Tc of HgBa2CuO4+δ and the inverse parabolic Tc-relation (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 393-396 
    Details
    ISSN: 1572-9605
    Keywords: high temperature superconductivity ; pressure effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have observed a δ-independent linear pressure effect on Tc of HgBa2CuO4+δ under hydrostatic pressures up to 1.7 GPa for δ≤0.30 but a nonlinear effect for δ〉0.30. These results, together with previous doping data, show a possible non-rigidity of the electron bands of the compounds, based on which previous phenomenological models of the pressure effect on Tc are built, and thus suggest only a restricted universality for the inverse parabolic relation between Tc and charge carriers per CuO2-layer. In other words, factors in addition to charge carriers can affect high temperature superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722813
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  • 2
    Electronic Resource
    Electronic Resource
    Superconductivity at higher temperatures in the Hg-Ba-Ca-Cu-O compound system (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 1-7 
    Details
    ISSN: 1572-9605
    Keywords: High-temperature superconductivity ; compound synthesis ; pressure effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Our recent systematic examination of the pressure effect on high-temperature superconductors revealed that the highest achievable superconducting transition temperature (T c) in the layered cuprates may lie between ∼150 and ∼180 K. We propose that the newly discovered Hg-Ba-Ca-Cu-O (HBCCO) compound system may be one of the most promising candidates for such a high-T c superconductor, because of the possible large range of modulation doping associated with the linear oxygen coordination of divalent Hg in HBCCO. A record-high magnetically determined transition at 135 K with a zero resistivity at 134 K has been obtained by us in HgBa2Ca2Cu3O8+δ . TheT c of HgBa2Ca2Cu3O8+δ was found to increase continuously with pressure at an increasing rate up to ∼17 kbar without any sign of saturation. The thermo-power shows an underdoped characteristic. These observations suggest that theT c of HBCCO can be further enhanced with proper modulation doping without inducing any structural instabilities. The results together with the synthesis steps of HBCCO are summarized and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730358
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