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24 Aug 1998

Volume 73, Issue 8, pp. 1017-1159

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Observation of the Abrikosov vortex lattice in NbSe2 with magnetic force microscopy

A. Volodin, K. Temst, C. Van Haesendonck, and Y. Bruynseraede

Appl. Phys. Lett. 73, 1134 (1998); http://dx.doi.org/10.1063/1.122107 (3 pages) | Cited 22 times

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We have imaged the Abrikosov vortex lattice on the surface of a conventional superconductor with a low-temperature magnetic force microscope, which is based on commercially available piezoresistive cantilevers. The heat dissipation at low temperature is limited by operating the cantilevers at higher mechanical resonances, allowing one to improve the signal-to-noise ratio by a factor of 3. Using a Co/Au multilayer for the magnetic tip coating, the interaction with the vortices can be kept small, and it is possible to observe a stable vortex lattice on the surface of a cleaved NbSe2 crystal. The stability of the vortex lattice can be understood in terms of collective pinning effects. © 1998 American Institute of Physics.
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74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.72.-h Cuprate superconductors

Local Cu and Br environments and their relationship to superconductivity restoration in brominated YBa2Cu3Oy

D. M. Potrepka, D. B. Fenner, M. Balasubramanian, W. A. Hines, and J. I. Budnick

Appl. Phys. Lett. 73, 1137 (1998); http://dx.doi.org/10.1063/1.122108 (3 pages) | Cited 3 times

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63,65Cu nuclear quadrupole resonance (NQR) and Br k-edge x-ray absorption fine structure (XAFS) have been used to study the local structures in well-characterized samples of deoxygenated and brominated YBa2Cu3Oy(YBCO). NQR shows that after bromination of YBa2Cu3O6.1 at 260 °C, oxygen has repopulated the chain sites. From XAFS, it is concluded that Br does not enter the YBCO lattice, but rather precipitates out as small nanoscale particles of BaBr2. These results provide clear evidence of the role of Br in reoxygenating the YBCO structure and an explanation for the partial restoration of superconductivity in the YBCO system. © 1998 American Institute of Physics.
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74.25.N- Response to electromagnetic fields
74.72.-h Cuprate superconductors
76.60.Gv Quadrupole resonance
78.70.Dm X-ray absorption spectra
64.75.-g Phase equilibria
74.62.Dh Effects of crystal defects, doping and substitution
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