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Journal Article

Electronic phase separation in La2-xSrxCuO4+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., Bernhard, C., et al. (2006). Electronic phase separation in La2-xSrxCuO4+y. Physica B, 374-375, 199-202.


Cite as: https://hdl.handle.net/21.11116/0000-000F-032B-E
Abstract
We have discovered an electronically driven phase separation in
super-oxygenated La2-xSrxCuO4+y, with various Sr contents. The samples
have been characterized by muon spin rotation and bulk magnetization
measurements. For all Sr levels with x < 0.125, excess oxygen produces
samples with a superconducting phase with T-C near 40 K and a separate
magnetic phase, a spin density wave that also orders near 40 K. The
observed magnetic region is closely related to the anomalous, 1/8th
hole doped, magnetic versions of La2CuO4, and the superconducting
region is optimally doped. The two phases are likely to be the only
stable ground states in this region of the phase diagram. This simple
two-component system may represent the most direct observation of
electronic phase separation in cuprate superconductors. Thus La2CuO4,
doped with substitutional Sr and interstitial 0 introduces an
interesting new material system for the field of high-temperature
superconductivity. (c) 2005 Elsevier B.V. All rights reserved.