Structure, Resistivity, Critical Field, Specific-Heat Jump at T c , Meissner Effect, a.c. and d.c. Susceptibility of the High- T c Superconductor YBa 2 Cu 3 O 7

Autor:	Louis Antognazza, M. Banovski, T. Graf, Alfred-Adrien Manuel, Klaus Yvon, L. Hoffmann, M. François, Eric Walker, J. Cors, Jean Muller, Martin Peter, Michel Decroux, P. Genoud, A. Bezinge, Alain Junod, Ø. Fischer, J.L. Jorda, D. Cattani
Rok vydání:	1987
Předmět:	Superconductivity Materials science Condensed matter physics Meissner effect Electrical resistivity and conductivity Impurity Condensed Matter::Superconductivity Differential thermal analysis Transition temperature Neutron diffraction General Physics and Astronomy Critical field
Zdroj:	Europhysics Letters (EPL). 4:247-252
ISSN:	1286-4854 0295-5075
Popis:	YBa2Cu3O7 superconductors with inductive transitions as narrow as 0.45 K above 90 K were synthetized. Samples were characterized by thermogravimetry, differential thermal analysis, X-ray and neutron diffraction. The structure is characterized by a two-dimensional Cu-O network with square-pyramidal and square-planar coordinated Cu atoms. Results show a clear metallic behaviour of the resistivity. An orbital critical field as high as 300 T is extrapolated. Meissner flux expulsion up to 40% is observed. Small amounts of magnetic Cu2+ ions are correlated with the presence of the impurity phase BaCuO2. The Pauli susceptibility and the specific-heat jump at Tc are consistent with γ 2 mJ/(K2 gat) (9 mJ/(K2 mole-Cu)), neglecting all renormalizations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::df4e3514e8f7c19f93cf53dbd7852b86 https://doi.org/10.1209/0295-5075/4/2/018 Zobrazit plný text záznamu