Order-disorder transition of vortex matter in a-MoxGe1-x films probed by noise

被引：49

作者：

Okuma, S. ^{[1
]}

Kashiro, K. ^{[1
]}

Suzuki, Y. ^{[1
]}

Kokubo, N. ^{[2
]}

机构：

[1] Tokyo Inst Technol, Res Ctr Low Temp Phys, Meguro Ku, Tokyo 1528551, Japan

[2] Kyushu Univ, Ctr Res & Advancement Higher Educ, Chuoh Ku, Fukuoka 8100044, Japan

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.77.212505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We measure voltage noise spectra S(V)(f) generated by current-driven vortices at various fields B including the peak-effect regime for amorphous Mo(x)Ge(1-x) films with Corbino-disk and striplike contact geometries. Field dependences of the critical current I(c) and S(V)(f) are nearly independent of contact geometries, indicating that edge effects are not important on static or dynamic vortex properties. This is in contrast to the result reported for NbSe(2) crystals with much larger thickness. S(V)(f) at low frequency f exhibits a sharp peak just below the peak field B(p) of I(c), where the characteristic time of vortex motion increases significantly. The results suggest the existence of the order-disorder transition and vortex instabilities due to coexisting vortex phases at around B(p).

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