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Thermal expansion of the high-7c superconductors REBa2Cu3O7 (RE Y, Dy) revisited at low temperatures
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Thermal expansion of the high-7c superconductors REBa2Cu3O7 (RE Y, Dy) revisited at low temperatures
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Journal Article
Thermal expansion of the high-7c superconductors REBa2Cu3O7 (RE Y, Dy) revisited at low temperatures
2014
Overview
The linear thermal expansion coefficient α(T) of two high-Tc superconductors, YBa2Cu3O7 and DyBa2Cu3O7 has been revisited in the 4.5-80K temperature range. The X-ray diffraction analysis and microstructural characterization using scanning electron microscopy confirm an orthorhombic single phase with an average of the grain size of about 20 μm for both polycrystalline samples. In the case of the Dy compound, a small magnetic excess superimposed to the high phonon contribution is observed in the T3 term, whereas no anomaly is detected below 40K. The deduced magnetic contribution αm(T) which increases monotonically with rising temperature is attributed to the CF interactions induced by the 4f electric quadrupole moment of the Dy Kramers ions. A discussion and a comparison with respect to the previous experimental and theoretical works are presented.
Publisher
IOP Publishing
Subject
