Microwave spectra of d-wave superconductors
C. T. Rieck, K. Scharnberg, J. Ruvalds
DOI 10.1103/PhysRevB.60.12432 · Physical Review B
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Abstract
A theory of the anomalous microwave conductivity and surface resistance of high-temperature superconductors is developed for a nested Fermi surface. The damping Γ is derived for electron collisions across nearly parallel orbit segments. Above the superconducting temperature Γ(ω,T) is linear in frequency ω and temperature T, in accord with the anomalous non-Drude conductivity which differentiates high-Tc cuprates from conventional metals. In the superconducting state a d-wave energy gap suppresses the damping—by reducing available scattering states—and thus explains why the YBCO microwave surface resistance Rs drops so dramatically when the temperature is a few degrees below Tc=90 K. Numerical calculations of the infrared conductivity, reflectivity, microwave Rs, and penetration depth are presented, and comply with the YBCO experimental data if the gap has a large maximum value Δdm≃4Tc. The cuprate spectral shapes differ notably from conventional BCS theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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