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Quantum vortex tunneling in YBa2Cu3O7-δ thin films
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DOI：10.1103/PhysRevB.76.134516.png)
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Abstract
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Cuprate films offer a unique opportunity to observe vortex tunneling effects due to their unusually low superfluid density and short coherence length. Here, we measure the magnetoresistance (MR) due to vortex motion of a long meander line of a superconducting film made of underdoped YBa(2)Cu(3)O(7-delta). At low temperatures (T), the MR shows a significant deviation from Arrhenius activation. The data are consistent with two dimensional variable range hopping (VRH) of single vortices, i.e., MR proportional to exp[-(T(0)/T)(1/3)]. The VRH temperature scale T(0) depends on the vortex tunneling rates between pinning sites. We discuss its magnitude with respect to estimated parameters of the meander thin film.
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