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Bulletin of the American Physical Society

Investigation of the bosonic spectral density in highly under-doped YBa$_{2}$Cu$_{3}$O$_{6.35 }$

Jing Hai Yang, T. Timusk, D. A. Bonn, Ruixing Liang, W. N. Hardy

Published Mar 12, 2008• 0 citations
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Investigation of the bosonic spectral density in highly under-doped YBa2_{2}2​Cu3_{3}3​O6.35_{6.35 }6.35​
Dragging Individual Vortices to Probe the Dimensionality of Pinning in YBa2_{2}2​Cu3_{3}3​O7−δ_{7-\delta}7−δ​
NanoSQUIDs from YBa2_22​Cu3_33​O7_77​/SrTiO3_33​ superlattices with bicrystal grain boundary Josephson junctions
We report on the fabrication and characterization of nanopatterned dc SQUIDs with grain boundary Josephson junctions based on heteroepitaxially grown YBa2_22​Cu3_33​O7_77​ (YBCO)/ SiTrO3_33​ (STO) superlattices on STO bicrystal substrates. Nanopatterning is performed by Ga focused-ion-beam milling. The electric transport properties and thermal white flux noise of superlattice nanoSQUIDs are comparable to single layer YBCO devices on STO bicrystals. However, we find that the superlattice nanoSQUIDs have more than an order of magnitude smaller low-frequency excess flux noise, with root-mean-square spectral density SΦ1/2∼5−6 μΦ0/HzS_Φ^{1/2}\sim 5-6\,μΦ_0/\sqrt{\rm Hz}SΦ1/2​∼5−6μΦ0​/Hz​ at 1 Hz (Φ0Φ_0Φ0​ is the magnetic flux quantum). We attribute this improvement to an improved microstructure at the grain boundaries forming the Josephson junctions in our YBCO nanoSQUDs.