Neutron scattering study of the effects of dopant disorder on the superconductivity and magnetic order in stage-4 La2CuO4+y
Y. S. Lee, F. C. Chou, A. Tewary, M. A. Kastner, S. H. Lee, R. J. Birgeneau
DOI 10.1103/PhysRevB.69.020502 · Physical Review B
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Abstract
We report neutron scattering measurements of the structure and magnetism of stage-4 La2CuO4+y with Tc≃42K. Our diffraction results on a single crystal sample demonstrate that the excess oxygen dopants form a three-dimensional ordered superlattice within the interstitial regions of the crystal. The oxygen superlattice becomes disordered above T≃330K, and a fast rate of cooling can freeze in the disordered-oxygen state. Hence, by controlling the cooling rate, the degree of dopant disorder in our La2CuO4+y crystal can be varied. We find that a higher degree of quenched disorder reduces Tc by ∼5K relative to the ordered-oxygen state. At the same time, the quenched disorder enhances the spin-density wave order in a manner analogous to the effects of an applied magnetic field.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | unknown |
| La2CuO4+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.8 | Pressure not reported | midpoint |
| La2CuO4+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.8 | Pressure not reported | midpoint |
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