Naslov
Temperature dependence of the magnetic anisotropy of metallic Y-Ba-Cu-O single crystals in the normal phase

Autori
Miljak, Marko ; Zlatić, Veljko ; Kos, Igor ; Aviani, Ivica ; Hamzić, Amir ; Collin, G.

Izvornik
Physical review. B, Condensed matter (0163-1829) 42 (1990), 16; 10742, 4

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
magnetic anisotropy ; Y-Ba-Cu-0 ; superconducting fluctuations

Sažetak
The magnetic anisotropy measurements of metallic Y-Ba-Cu-0 compounds in the normal phase reveal a temperature-dependent diamagnetic component of the susceptibility that increases with decreasing temperature. The temperature variation of the susceptibility anisotropy and its total change do not seem to be much affected by the presence of the superconductivity at some lower temperature and could not be accounted for by superconducting fluctuations. Rather, the data remind one of the behavior of some quasi-two- dimensional metals with anisotropic Fermi surfaces, reflecting the properties of the low- energy excitations in the normal phase. The anisotropy measurements above the bulk superconducting transition temperature T, reveal the nonlinear effects, which are due to the onset of superconductivity in disconnected grains. The existence of a two-step transition, typical for granular superconductors, should be taken into consideration if the normalphase susceptibility data are compared with the theoretical predictions in the vicinity of T.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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