THERMALLY ACTIVATED FLUX MOTION IN ND1.85CE0.15CUO4-Y

被引：14

作者：

FABREGA, L ^{[1
]}

FONTCUBERTA, J ^{[1
]}

PINOL, S ^{[1
]}

VANDERBEEK, CJ ^{[1
]}

KES, PH ^{[1
]}

机构：

[1] KAMERLINGH ONNES LAB,2300 RA LEIDEN,NETHERLANDS

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.46.11952

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Flux motion in a Nd1.85Ce0.15CuO4-gamma single crystal has been studied by using ac susceptibility experiments under a bias dc field for H parallel to the c axis. It is found that the irreversibility line is given by H(T)=H(0)(1 - t)2. Analysis of the susceptibility curves within the framework of a thermally activated flux motion allows the extraction of the activation energies U(T,B). It tums out that U(T=0,B=1T) almost-equal-to 40 meV, which is notably larger than the energies typically found in p-type high-temperature superconductors. Single-vortex and collective-pinning mechanisms by oxygen vacancies are investigated to account for the observed field dependence of the activation energies. The dependence of energy absorption on the ripple ac field is also investigated.

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收藏

页码：11952 / 11957

页数：6

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