Umklapp scattering in unconventional superconductors: Microwave conductivity shows that κ−(BEDT−TTF)2Cu[N(CN)2]Br is a dxy superconductor
D. C. Cavanagh, B. J. Powell
DOI 10.1103/PhysRevB.100.054505 · Physical Review B
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Abstract
Microwave conductivity experiments can directly measure the quasiparticle scattering rate in the superconducting state. We show that this, combined with knowledge of the Fermi surface geometry, can distinguish between closely related superconducting order parameters, e.g., dx2−y2 and dxy superconductivity. We benchmark this method on YBa2Cu3O7−δ and, unsurprisingly, confirm that this is a dx2−y2 superconductor. We then apply our method to κ−(BEDT−TTF)2Cu[N(CN)2]Br, which we discover is a dxy superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (BEDT-TTF)2Cu[N(CN)2]Br 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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