Absence of circular dichroism in high-temperature superconductors
Taylor W. Lawrence, A. Szöke, R. B. Laughlin
DOI 10.1103/PhysRevLett.69.1439 · Physical Review Letters
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Abstract
We have repeated and improved upon the experiment of Lyons et al., in which the observation of circular dichroism in high-Tc superconductors was reported. We found a simple extension to the previous technique which makes the apparatus exclusively sensitive to T-violating circular dichroism. We find no evidence for a temperature-dependent signal in all YBa2Cu3O7−δ samples studied. We establish sensitivity of the apparatus to surface roughness and ascribe the previously observed signal to possible surface contamination.
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 |
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