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arXiv 0704.0126cond-mat.supr-con
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I-V薄膜中涡旋态的特性

I-V characteristics of the vortex state in MgB2 thin films

Huan Yang, Ying Jia, Lei Shan, Yingzi Zhang, Hai-Hu Wen, Chenggang Zhuang, Zikui Liu, Qi Li, Yi Cui, Xiaoxing Xi

摘要:

研究了在平行于c轴的不同磁场下不同MgB_2薄膜的电流-电压特性。在磁场\mu 0 H下,在0 ~ 5 T范围内,I-V等温线中出现了涡旋液体-玻璃化转变。在准二维涡旋玻璃理论的框架下,不同温度下测得的I-V曲线具有标度性。然而,在\mu 0 H >= 5 T时,在最低温度T= 1.7 K时观察到有限耗散,并且I-V等温线不按任何已知的标度律标度,任何维数。我们认为这可能是由σ带涡旋和π带准粒子的混合引起的。有趣的是,在零磁场下的I-V曲线仍然可以根据准2D涡旋玻璃形式主义来缩放,这表明由于持续电流和施加的磁场引起的自场的等效效应。

英文摘要:

The current-voltage (I-V) characteristics of various MgB2 films have been studied at different magnetic fields parallel to c-axis. At fields \mu0H between 0 and 5T, vortex liquid-glass transitions were found in the I-V isotherms. Consistently, the I-V curves measured at different temperatures show a scaling behavior in the framework of quasi-two-dimension (quasi-2D) vortex glass theory. However, at \mu0 H >= 5T, a finite dissipation was observed down to the lowest temperature here, T=1.7K, and the I-V isotherms did not scale in terms of any known scaling law, of any dimensionality. We suggest that this may be caused by a mixture of σband vortices and πband quasiparticles. Interestingly, the I-V curves at zero magnetic field can still be scaled according to the quasi-2D vortex glass formalism, indicating an equivalent effect of self-field due to persistent current and applied magnetic field.

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