Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-09-12
Physics
Condensed Matter
Strongly Correlated Electrons
4 figures included in text; submitted to PRB
Scientific paper
10.1103/PhysRevB.69.020502
We report neutron scattering measurements of the structure and magnetism of stage-4 La_2CuO_{4+y} with T_c ~42 K. 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 ~ 330 K, 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 La_2CuO_{4+y} crystal can be varied. We find that a higher degree of quenched disorder reduces T_c by ~ 5 K 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.
Birgeneau Robert J.
Chou Fang-Chieh
Kastner Marc A.
Lee Hong Seok
Lee Young Sam
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