A search for extra lattice distortions associated with the superconductivity and the charge inhomogeneities in the high-Tc La1.85Sr0.15CuO4 system

Precise measurements of the temperature-dependent lattice parameters in a single crystal of La1.85Sr0.15CuO4 are made by X-ray bond method and analyzed comparing the normal thermal expansion term, proportional to T4. A spontaneous lattice contraction of about 2.3 x 10-5 angstroms was found in the ab...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 2004-08, Vol.65 (8-9), p.1445-1448
Main Authors: MAETA, H, ONO, F, KAWABATA, C, SAINI, N. L
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:Precise measurements of the temperature-dependent lattice parameters in a single crystal of La1.85Sr0.15CuO4 are made by X-ray bond method and analyzed comparing the normal thermal expansion term, proportional to T4. A spontaneous lattice contraction of about 2.3 x 10-5 angstroms was found in the ab-plane, while along the c-axis a small expansion of about 1.5 x 10-5 angstroms was observed below the superconducting transition temperature of the system, showing some correlation between the structure and the high-Tc superconductivity. A careful search has been made for existence of any extra lattice distortion above the Tc, that might be associated with the stripe inhomogeneities in the title system, however, within the experimental sensitivity authors could not find such distortions. 26 refs.
ISSN:0022-3697
1879-2553
DOI:10.1016/j.jpcs.2004.01.011