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Infrared Studies of the Superconducting Energy Gap and Normal State Dynamics of Y1Ba2Cu3O7 and Ba0.6K0.4BiO3

  • Properties of High Tc Superconductors
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Conclusions

Infrared measurements were the first spectroscopic technique used to probe the energy gap in conventional superconductors (in 1957).4 They have been widely used since that time and remain a powerful probe of the intrinsic dynamics of superconductors. In the cuprates, infrared measurements were the first to reveal the intrinsic energy gap (in 1987),14 which is 2Δ≃500 cm−1; i.e. 2Δ/kTc≃8, for the CuO2 planes. Because infrared measurements penetrate deeply (∼1,500 Å), they are able to probe the intrinsic bulk dynamics of the cuprates. So far it appears that the best and most reproducible results come from Y1Ba2Cu3O7 (fully oxygenated). In addition to measuring the energy gap, and its temperature dependence, infrared measurements have been used to probe the very unusual normal state dynamics of Y1Ba2Cu3O7. Here the salient result is a scattering rate that varies like kT + ħω, suggesting that “Y1Ba2Cu3O7 is at the edge of the regime in which a Fermi liquid theory is well defined.”31

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  1. Z. Schlesinger
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  2. R. T. Collins
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Schlesinger, Z., Collins, R.T. Infrared Studies of the Superconducting Energy Gap and Normal State Dynamics of Y1Ba2Cu3O7 and Ba0.6K0.4BiO3. MRS Bulletin 15, 38–43 (1990). https://doi.org/10.1557/S0883769400059492

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