Phase separation in superoxygenated La2-xSrxCuO4+y

Mohottala, H. E.; Wells, B. O.; Budnick, J. I.; Hines, W. A.; Niedermayer, C.; Udby, L.; Bernhard, C.; Moodenbaugh, A. R.; Chou, F. C.

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Phase separation in superoxygenated La_2-xSr_xCuO_4+y

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Bernhard, C.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Mohottala, H. E., Wells, B. O., Budnick, J. I., Hines, W. A., Niedermayer, C., Udby, L., et al. (2006). Phase separation in superoxygenated La_2-xSr_xCuO_4+y. Nature Materials, 5(5), 377-382.

Cite as: https://hdl.handle.net/21.11116/0000-000F-02AB-E

Abstract

The complex interplay between superconducting and magnetic phases
remains poorly understood. Here, we report on the phase separation of
doped holes into separate magnetic and superconducting regions in
superoxygenated La2-xSrxCuO4+y, with various Sr contents. Irrespective
of Sr-doping, excess oxygen raises the superconducting onset to 40 K
with a coexisting magnetic spin-density wave that also orders near 40 K
in each of our samples. The magnetic region is closely related to the
anomalous, 1/8-hole-doped magnetic versions of La2CuO4, whereas the
superconducting region is optimally doped. The two phases are probably
the only truly stable ground states in this region of the phase
diagram. This simple two-component system is a candidate for electronic
phase separation in cuprate superconductors, and a key to understanding
seemingly conflicting experimental observations.