Low energy excitations in superconducting La1.86Sr0.14CuO4
T. E. Mason, G. Aeppli, S. M. Hayden, A. P. Ramirez, H. A. Mook
DOI 10.1103/PhysRevLett.71.919 · Physical Review Letters
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Abstract
We present magnetic neutron scattering and specific heat data on the high-Tc superconductor La1.86Sr0.14CuO4. Both types of measurements show that even when the samples are superconducting, there are excitations with energies well below 3.5kBTc. These excitations coincide with a magnetic response, χ’’, whose amplitude is considerably below that observed at Tc=35±1 K. At the same time, the wave-vector dependence of χ’’ is identical to that for the normal state, which implies that the low frequency excitations in our crystals are not those associated with the nodes of a clean d-wave superconductor. However, the data are consistent with gapless superconductivity of the type induced by localized magnetic impurities, clearly observed in the specific heat measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.86Sr0.14CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| La1.86Sr0.14CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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