Anisotropy of the Irreversible Magnetic Behaviour of YBaCuO and TlBaCaCuO Single Crystals–A Comparative a.c.-Susceptibility Study

Autor:	Ch. Neumann, Ch. Heinzel, Paul J. Ziemann
Rok vydání:	1990
Předmět:	chemistry.chemical_classification Materials science High-temperature superconductivity Field (physics) Condensed matter physics General Physics and Astronomy Magnetic susceptibility law.invention Magnetic field chemistry law Anisotropy Single crystal Critical field Inorganic compound
Zdroj:	Europhysics Letters (EPL). 13:531-536
ISSN:	1286-4854 0295-5075
DOI:	10.1209/0295-5075/13/6/010
Popis:	Applying an a.c.-susceptibility technique, the lower critical fields Hc1(T) as well as the irreversibility lines Hc*(T/Tc) ~ (1 - T/Tc)α have been determined for YBaCuO and Tl2Ba2CaCu2O8 single crystals. Pronounced anisotropies are observed for the above quantities in both systems indicating the strong influence of the Cu-O planes. As a main result, the exponent α describing the temperature behaviour of the irreversibility lines is found to exhibit a clear dependence on the field orientation: if the field is oriented perpendicular to the Cu-O planes, one observes α = 4/3 for both HTSC systems. For fields parallel to the Cu-O planes α = 3/2 for YBaCuO and α = 1 for Tl2Ba2CaCu2O8.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a9d9fc2ee4627986f63a3ed123b4d776 https://doi.org/10.1209/0295-5075/13/6/010 Zobrazit plný text záznamu