Observation of a low-energy infrared anomoly in superconducting La1.85Sr0.15CuO4
Z. Schlesinger, R. T. Collins, M. W. Shafer
DOI 10.1103/PhysRevB.35.7232 · Physical Review B
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Abstract
We have studied the infrared reflectivity of normal and superconducting La2−xSrxCuO4 up to 4000 cm−1. For x=0.15 we observe an electronic excitation at about 60 meV (450 cm−1), and, at essentially the same energy, an optic phonon. As we move away from the optimal high critical temperature (Tc) value of x=0.15, we find that these features become much weaker. We propose that this 60-meV electronic excitation and the phonon in resonance with it provide the mediating interaction which gives rise to superconductivity at such high temperatures in this class of materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
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