Low Temperature Physics: 23, 618 (1997); https://doi.org/10.1063/1.593476 (5 pages)
Lower critical fields of textured high-Tc superconductors
V. A. Finkel` and V. V. Toryanik
National Scientific Center " Physico-Tekhnical Insititute ", 1 Academicheskaya st., Kharkov 310108, Ukraine
( Submitted July 4, 1996, revised November 11, 1996 )
In terms of the theory of magnetic properties of anisotropic superconductors, the concepts are developed, which analyze the possibilities of studying anisotropy of the lower critical fields of HTSC in the process of measuring the critical currents of textured samples after their exposure to the magnetic fields applies in three different directions. The critical fields Hc1ab and Hc1c of HTSC YBa2Cu3O7-d and DyBa2Cu3O7-d are estimated at T=77.3 K. It is found that the dependences Hc1ab(m c/mab) and Hc1c (mc/mab) are universal for all the subjects studied.