Vortex-creep activation energy in YBa2Cu3O7/PrBa2Cu3O7 superlattices

Vortex activation energy in the AC magnetic response of superconducting YBa2Cu3O7thin films with complex pinning structures

“…With J d ∼4×10 5 A cm −2 , and J=J p =J d , the above relation supplies U AC ∼2×10 3 K, which accounts for the order of magnitude of U AC just below the IL at μ 0 H DC =0.2 T. Estimated as above, L eff may introduce significant errors in the calculated U AC . For this reason, we have recently investigated the AC magnetic response of almost-decoupled YBa 2 Cu 3 O 7 /PrBa 2 Cu 3 O 7 superlattices [41], where the thickness of YBCO offers a precise measure of L eff [42], obtaining a good agreement between the determined and calculated U AC .…”

AC magnetic response of superconducting YBa2Cu3O7/PrBa2Cu3O7 superlattices

“…The fit in the Arrhenius plot leads for H = 5 kOe to U 0 ∼ 10 4 K (Y11Pr4, with f 0 ∼ 1 GHz), and to U 0 ∼ 2.4×10 3 K in the case of Y4Pr4 (where f 0 slightly decreases), which are similar to those extracted from DC transport measurements. 13 U AC (T) is obtained from U 0 and the linear U AC (T) dependence. It results U AC (T = 73.5 K) = 1550 K (Y11Pr4, H = 5 kOe), and U AC (T = 55.5 K) = 706 K (Y4Pr4, H = 5 kOe).…”

“…The presence of four-unit-cell thick nonsuperconducting layers leads to almost decoupled superconducting blocks. 13 Such samples offer a precise measure of the length of the hopping vortex segment, since the vortex correlation along a Author to whom correspondence should be addressed. Electronic mail: lucica50@yahoo.com 2158-3226/2016/6(6)/065027/7 6, 065027-1 © Author(s) 2016.…”

Irreversibility line and thermally activated flux flow in Micro-bridges of high-temperature superconductor

“…The temperature indicating the vortex-glass phase T g transition obtained from T-axis intercept of versus T plot [19,20]. As shown in Figure 5, the estimated vortex glass transition temperature T g for different magnetic fields is shown in Table 3.…”