Interplay of structural and electronic phase separation in single-crystalline La
2CuO4.05 studied by neutron and Raman scattering

Gnezdilov, V. P.; Pashkevich, Y. G.; Tranquada, J. M.; Lemmens, P.; Güntherodt, G.; Yeremenko, A. V.; Barilo, S. N.; Shiryaev, S. V.; Kurnevich, L. A.; Gehring, P. M.

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Interplay of structural and electronic phase separation in single-crystalline La₂CuO_4.05 studied by neutron and Raman scattering

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

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Gehring, P. M.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Gnezdilov, V. P., Pashkevich, Y. G., Tranquada, J. M., Lemmens, P., Güntherodt, G., Yeremenko, A. V., et al. (2004). Interplay of structural and electronic phase separation in single-crystalline La₂CuO_4.05 studied by neutron and Raman scattering. Physical Review B, 69(17): 174508.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FE8E-5

Abstract

We report a neutron- and Raman-scattering study of a single crystal of
La2CuO4.05 prepared by high-temperature electrochemical oxidation.
Elastic neutron-scattering measurements show the presence of two
phases, corresponding to the two edges of the first miscibility gap,
all the way up to 300 K. An additional oxygen redistribution, driven by
electronic energies, is identified at 250 K in Raman scattering (RS)
experiments by the simultaneous onset of two-phonon and two-magnon
scattering, which are fingerprints of the insulating phase. Elastic
neutron-scattering measurements show directly an antiferromagnetic
ordering below a Neel temperature of T-N=210 K. The opening of the
superconducting gap manifests itself as a redistribution of electronic
Raman scattering below the superconducting transition temperature,
T-c=24 K. A pronounced temperature-dependent suppression of the
intensity of the (100) magnetic Bragg peak has been detected below T-c.
We ascribe this phenomenon to a change of relative volume fraction of
superconducting and antiferromagnetic phases with decreasing
temperature caused by a form of a superconducting proximity effect.