TY - JOUR
T1 - Manifestation of vortex depinning transition in nonlinear current-voltage characteristics of polycrystalline superconductor Y1-xPrxBa2Cu3O7-δ
AU - Rivera, V. A.G.
AU - Stari, C.
AU - Sergeenkov, S.
AU - Marega, E.
AU - Araújo-Moreira, F. M.
N1 - Funding Information:
This work has been financially supported by the Brazilian agencies CNPq, CAPES and FAPESP.
PY - 2008/7/21
Y1 - 2008/7/21
N2 - We present our recent results on the temperature dependence of current-voltage characteristics for polycrystalline Y1-xPrxBa2Cu3O7-δ superconductors with x = 0.0, 0.1 and 0.3. The experimental results are found to be reasonably well fitted for all samples by a power like law of the form V = R (I - Ic)a (T). Here, we assume that a (T) = 1 + Φ0 IC (T) / 2 π kB T and IC (T) = IC (0) (1 - T / TC)3 / 2 for the temperature dependences of the power exponent and critical current, respectively. According to the theoretical interpretation of the obtained results, nonlinear deviation of our current-voltage characteristics curves from Ohmic behavior (with a (TC) = 1) below TC is attributed to the manifestation of dissipation processes. They have a characteristic temperature Tp defined via the power exponent as a (Tp) = 2 and are related to the current induced depinning of Abrikosov vortices. Both TC (x) and Tp (x) are found to decrease with an increase of Pr concentration x reflecting deterioration of the superconducting properties of the doped samples.
AB - We present our recent results on the temperature dependence of current-voltage characteristics for polycrystalline Y1-xPrxBa2Cu3O7-δ superconductors with x = 0.0, 0.1 and 0.3. The experimental results are found to be reasonably well fitted for all samples by a power like law of the form V = R (I - Ic)a (T). Here, we assume that a (T) = 1 + Φ0 IC (T) / 2 π kB T and IC (T) = IC (0) (1 - T / TC)3 / 2 for the temperature dependences of the power exponent and critical current, respectively. According to the theoretical interpretation of the obtained results, nonlinear deviation of our current-voltage characteristics curves from Ohmic behavior (with a (TC) = 1) below TC is attributed to the manifestation of dissipation processes. They have a characteristic temperature Tp defined via the power exponent as a (Tp) = 2 and are related to the current induced depinning of Abrikosov vortices. Both TC (x) and Tp (x) are found to decrease with an increase of Pr concentration x reflecting deterioration of the superconducting properties of the doped samples.
KW - Current-voltage characteristics
KW - Vortex depinning
KW - YPrBaCuO
UR - http://www.scopus.com/inward/record.url?scp=46749084185&partnerID=8YFLogxK
U2 - 10.1016/j.physleta.2008.05.073
DO - 10.1016/j.physleta.2008.05.073
M3 - Artículo
AN - SCOPUS:46749084185
SN - 0375-9601
VL - 372
SP - 5089
EP - 5092
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 30
ER -