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arXiv 0803.2078cond-mat.supr-concond-mat.str-el
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磁场对涡旋激活能的影响:MgB2,NbSe2和Bi2Sr2Ca2Cu3O10超导体的比较

Magnetic field dependence of vortex activation energy: a comparison between MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10 superconductors

S. D. Kaushik, V. Braccini, S. Patnaik

摘要:

在低电流密度下的耗散机制进行了比较,在三个不同类别的超导体。这是通过测量作为温度和磁场的函数的电阻,在干净的NbSe 2,MgB 2和Bi 2 Sr 2 Ca 2 Cu 3 O 10超导体的多晶样品。热激活磁通流动行为清楚地确定在散装硼化镁。虽然MgB2在低场下的激活能与Bi2Sr2Ca2Cu3O10相当,但其场依赖性遵循抛物线行为,与Bi2Sr2Ca2Cu3O10中看到的幂律依赖性不同。我们分析了我们的结果的基础上的Kramer的缩放晶界钉扎在MgB2和NbSe2。

英文摘要:

The dissipative mechanism at low current density is compared in three different classes of superconductors. This is achieved by measurement of resistance as a function of temperature and magnetic field in clean polycrystalline samples of NbSe2, MgB2 and Bi2Sr2Ca2Cu3O10 superconductors. Thermally activated flux flow behavior is clearly identified in bulk MgB2. While the activation energy at low fields for MgB2 is comparable to Bi2Sr2Ca2Cu3O10, its field dependence follows a parabolic behavior unlike a power law dependence seen in Bi2Sr2Ca2Cu3O10. We analyze our results based on the Kramer's scaling for grain boundary pinning in MgB2and NbSe2.

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