Anomalous microwave conductivity due to collective transport in the pseudogap state of cuprate superconductors
C. Kusko, Z. Zhai, N. Hakim, R. S. Markiewicz, S. Sridhar, D. Colson, V. Viallet-Guillen, A. Forget, Yu. A. Nefyodov, M. R. Trunin, N. N. Kolesnikov, A. Maignan, A. Daignere, A. Erb
DOI 10.1103/PhysRevB.65.132501 · Physical Review B
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Abstract
The microwave surface impedance Zs=Rs+iXs of HgBa2Ca2Cu3O8+δ, HgBa2CuO4+δ, Tl2Ba2CuO6+δ, and underdoped YBa2Cu3O6.5 is found to be anomalous in that Rs(T>Tc)≠Xs(T>Tc) in the pseudogap state. This implies plasmonlike response and negative permittivities ɛ′(ω)<0 at microwave frequencies indicating non-Fermi-liquid transport in the ab plane. The anomalous microwave response is shown to arise from a collective mode characterized by a plasma frequency ωpCM∼0.1 eV and extremely low damping ΓCM∼10−5–10−4 eV, distinctly different from those observed at optical frequencies.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 122 | Pressure not reported | unknown |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94.4 | Pressure not reported | unknown |
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
| YBa2Cu3O6.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
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