Emergence of Coherent Magnetic Excitations in the High Temperature Underdoped La2−xSrxCuO4 Superconductor at Low Temperatures
O. J. Lipscombe, B. Vignolle, T. G. Perring, C. D. Frost, S. M. Hayden
DOI 10.1103/PhysRevLett.102.167002 · Physical Review Letters
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Abstract
We use inelastic neutron scattering to measure the magnetic excitations in underdoped La2−xSrxCuO4 (x=0.085, Tc=22 K) for large energy (5<E<200 meV) and temperature (5<T<300 K) ranges. At low T, the response is highly structured in E and q, with peaks in the local susceptibility at 15 and 50 meV and a four-peaked structure in q for E≈185 meV. Raising T from 30 K≳Tc to 300 K causes the structure in χ′′(q,ω) present for E<70 meV to disappear. It is replaced with a strongly damped response. We attribute this change to the disappearance of the pseudogap with increasing temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | onset |
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