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Field-dependent resistive transitions in YBa_2Cu_3O_(7-δ) thin films:Influence of the pseudogap on vortex dynamics
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作者 s H Naqib r s islam 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第1期467-473,共7页
The nature of resistive transition of high-quality crystalline thin films of YBa2Cu3O7-δhas been studied under magnetic fields(H) applied along the c direction over a wide range of doped holes, p, in the Cu O2 plan... The nature of resistive transition of high-quality crystalline thin films of YBa2Cu3O7-δhas been studied under magnetic fields(H) applied along the c direction over a wide range of doped holes, p, in the Cu O2 planes. The field- and temperature-dependent in-plane resistivity, ρab(T, H), has been analyzed within the thermally assisted flux-flow(TAFF)formalism. The flux activation energy, U(T, H), has been extracted from this analysis. The low-T part of the ρab(T, H)data can be described by an activation energy having the functional form of U(T, H) =(1- t)m(H-0/H)β, where t = T /Tc(reduced temperature), and H0 is a field scale that primarily determines the magnitude of U(T, H). The temperature exponent, m, shows a systematic variation with p, whereas the field exponent, β, is insensitive to the p values and is close to unity. The H0, on the other hand, changes rapidly as p is varied. U(T, H) is linked to the pinning potential and consequently on the superconducting condensation energy. Since the normal state pseudogap directly affects superconducting condensation energy, a clear correspondence between H0 and the PG energy scale, ε g, is found. Possible implications of these results are discussed. 展开更多
关键词 Y123 superconductors thermally assisted flux-flow model activation energy PSEUDOGAP
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