Evidence of interstitial oxygen in room temperature oxidized La2-xSrxCuO4+y (0-LESS-THAN-X-LESS-THAN-0.1)

C. Rial; U. Amador; E. Morán; M.A. Alario-Franco; N.H. Andersen

doi:10.1016/0921-4534(94)90569-X

Evidence of interstitial oxygen in room temperature oxidized La₂_-_xSr_xCuO₄₊_y (0-LESS-THAN-X-LESS-THAN-0.1)

C. Rial, U. Amador, E. Morán, M.A. Alario-Franco, N.H. Andersen

Research output: Contribution to journal › Journal article › Research

Abstract

The crystal structure, superconducting properties and oxygen stoichiometry of room temperature chemically oxidized La2-xSrxCuO4+y (x = 0.05, 0.09) have been studied by means of powder neutron diffraction, magnetic susceptibility and thermogravimetric analysis. The presence in these materials of interstitial oxygen located at (1/4, y, 3/4; y almost-equal-to 1/4), as previously observed in oxygen-rich La2CuO4+y, is proposed from neutron diffraction data at different temperatures. This is supported by the excess of mass loss detected by TG for the oxidized materials relative to the starting ones. Besides, an important improvement in the superconducting properties (T(c) and superconducting volume fraction) of these compounds is observed after oxidation. On the other hand, no phase separation into two phases with different oxygen content is observed at low temperature.

Original language	English
Journal	Physica C: Superconductivity and its Applications
Volume	234
Issue number	3-4
Pages (from-to)	237-248
ISSN	0921-4534
DOIs	https://doi.org/10.1016/0921-4534(94)90569-X
Publication status	Published - 1994

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@article{b0fae46b13c8452cad991a548fd35ded,

title = "Evidence of interstitial oxygen in room temperature oxidized La2-xSrxCuO4+y (0-LESS-THAN-X-LESS-THAN-0.1)",

abstract = "The crystal structure, superconducting properties and oxygen stoichiometry of room temperature chemically oxidized La2-xSrxCuO4+y (x = 0.05, 0.09) have been studied by means of powder neutron diffraction, magnetic susceptibility and thermogravimetric analysis. The presence in these materials of interstitial oxygen located at (1/4, y, 3/4; y almost-equal-to 1/4), as previously observed in oxygen-rich La2CuO4+y, is proposed from neutron diffraction data at different temperatures. This is supported by the excess of mass loss detected by TG for the oxidized materials relative to the starting ones. Besides, an important improvement in the superconducting properties (T(c) and superconducting volume fraction) of these compounds is observed after oxidation. On the other hand, no phase separation into two phases with different oxygen content is observed at low temperature. ",

keywords = "Materialer med s{\ae}rlige fysiske og kemiske egenskaber",

author = "C. Rial and U. Amador and E. Mor{\'a}n and M.A. Alario-Franco and N.H. Andersen",

year = "1994",

doi = "10.1016/0921-4534(94)90569-X",

language = "English",

volume = "234",

pages = "237--248",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

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TY - JOUR

T1 - Evidence of interstitial oxygen in room temperature oxidized La2-xSrxCuO4+y (0-LESS-THAN-X-LESS-THAN-0.1)

AU - Rial, C.

AU - Amador, U.

AU - Morán, E.

AU - Alario-Franco, M.A.

AU - Andersen, N.H.

PY - 1994

Y1 - 1994

N2 - The crystal structure, superconducting properties and oxygen stoichiometry of room temperature chemically oxidized La2-xSrxCuO4+y (x = 0.05, 0.09) have been studied by means of powder neutron diffraction, magnetic susceptibility and thermogravimetric analysis. The presence in these materials of interstitial oxygen located at (1/4, y, 3/4; y almost-equal-to 1/4), as previously observed in oxygen-rich La2CuO4+y, is proposed from neutron diffraction data at different temperatures. This is supported by the excess of mass loss detected by TG for the oxidized materials relative to the starting ones. Besides, an important improvement in the superconducting properties (T(c) and superconducting volume fraction) of these compounds is observed after oxidation. On the other hand, no phase separation into two phases with different oxygen content is observed at low temperature.

AB - The crystal structure, superconducting properties and oxygen stoichiometry of room temperature chemically oxidized La2-xSrxCuO4+y (x = 0.05, 0.09) have been studied by means of powder neutron diffraction, magnetic susceptibility and thermogravimetric analysis. The presence in these materials of interstitial oxygen located at (1/4, y, 3/4; y almost-equal-to 1/4), as previously observed in oxygen-rich La2CuO4+y, is proposed from neutron diffraction data at different temperatures. This is supported by the excess of mass loss detected by TG for the oxidized materials relative to the starting ones. Besides, an important improvement in the superconducting properties (T(c) and superconducting volume fraction) of these compounds is observed after oxidation. On the other hand, no phase separation into two phases with different oxygen content is observed at low temperature.

KW - Materialer med særlige fysiske og kemiske egenskaber

U2 - 10.1016/0921-4534(94)90569-X

DO - 10.1016/0921-4534(94)90569-X

M3 - Journal article

SN - 0921-4534

VL - 234

SP - 237

EP - 248

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 3-4

ER -