Anisotropy of <i>H</i> <i>c</i>2 and resistive transitions in orthorhombic and tetragonal single crystals of YBa2Cu3O<i>x</i>
A. V. BondarenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. Kharkov; A. M. Gorky State University, KharkovI. M. DmitrenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. Kharkov; A. M. Gorky State University, KharkovM. A. Obolenskiı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. Kharkov; A. M. Gorky State University, KharkovV. L. TovazhnyanskiiPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. Kharkov; A. M. Gorky State University, KharkovN. Ya. Fogel’Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. Kharkov; A. M. Gorky State University, KharkovV. G. CherkasovaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. Kharkov; A. M. Gorky State University, Kharkov
ABI
Abstract
Temperatures and angular dependences of the critical fields Hc2 have been measured in orthorhombic and superconducting tegragonal single crystals YBa2Cu3Ox. The peculiar features of resistive transitions and the shape of the angular dependences of Hc2 suggest that single crystals have a block-type structure. The nonlinearity ot the Hc2(T) dependence near Tc is found to be the more pronounced, the less perfect the single crystals.
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