Dynamics of single vortices in grain boundaries: I-V characteristics on the femtovolt scale

被引：23

作者：

Kalisky, B. ^{[1
]}

Kirtley, J. R. ^{[1
]}

Nowadnick, E. A. ^{[1
]}

Dinner, R. B. ^{[1
]}

Zeldov, E. ^{[1
,2
]}

Ariando ^{[3
]}

Wenderich, S. ^{[3
]}

Hilgenkamp, H. ^{[3
]}

Feldmann, D. M. ^{[4
]}

Moler, K. A. ^{[1
]}

机构：

[1] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[2] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel

[3] Univ Twente, Mesa Inst Nanotechnol, Low Temp Div, NL-7500 AE Enschede, Netherlands

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 20期

关键词：

barium compounds; flux pinning; grain boundaries; Hall effect; high-temperature superconductors; scanning probe microscopy; superconducting thin films; yttrium compounds; PAIRING SYMMETRY; FLUX-CREEP; THIN-FILMS; SUPERCONDUCTORS; YBA2CU3O7-DELTA; CROSSOVER; BICRYSTALS; TRANSPORT;

D O I：

10.1063/1.3137164

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBa2Cu3O6+delta thin films in the presence of an applied current. Detecting the motion of individual vortices allowed us to probe the current-voltage (I-V) characteristics of the grain boundary with voltage sensitivity below a femtovolt. We find a very sharp onset of dissipation with V proportional to I-n with an unprecedented high exponent of n approximate to 290 that shows essentially no dependence on temperature or grain boundary angle. Our data have no straightforward explanation within the existing grain boundary transport models.

引用

页数：3

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