Dynamic scaling for 2D superconductors in zero magnetic field

Dynamic scaling of I–V data for the neutral 2D Coulomb gas

“…The similarities between scaling results in experimental systems [3,4] and the simulations studied here are striking. In every case, optimization produces unexpectedly high, but universal values of z ≃ 5.6.…”

“…Recently the authors of this manuscript applied the FFH dynamic scaling to zero-field experimental data from two-dimensional (2D) superconducting films, Josephson junction arrays (JJA's), and superfuid 4 He films [3,4] to find a value z ≃ 5.6 for the dynamical critical exponent. The commonly expected and reported value of z for these systems is 2, which represents simple diffusion.…”

“…According to the dynamical scaling hypothesis of FFH, the critical isotherm, T = T c , is expected to form a perfect power-law, V ∝ I z+1 , thus appearing straight in a log-log plot of I and V . Generally, it is preferable to identify T c in this way, permitting only small variations from this estimate in an I-V fitting procedure [3,4]. However, according to the power-law criterion, the Lee-Teitel data all appear to lie in the high temperature range, T > T c .…”

Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ

“…It should be noted, however, that in real materials (even in ultrathin films) the conventional KT transition can be easily masked by other mechanisms, such as interlayer coupling, size effects, extrinsic and intrinsic weak links, thermal fluctuations, quasi-particle contributions, etc. [3,[6][7][8][9]. For example, Repaci et al…”

Vortex-unbinding and finite-size effects inTl2Ba2CaCu2Jin1, Wen2 2003Phys. Rev. B2020View full textAdd to dashboardCite

“…There are even results of z ≈ 6, as given by Ammirata et al 21 for the transport measurements of thin BSCCO crystal.…”