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Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides
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10.1063/1.2219506
/content/aip/journal/ltp/32/8/10.1063/1.2219506
http://aip.metastore.ingenta.com/content/aip/journal/ltp/32/8/10.1063/1.2219506
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The and curves for a 2-UC film (S2) at different frequencies [MHz]: 3 (triangles), 26 (squares), and 500 (circles), calculated from raw , , and data. The solid lines are a guide for the eye. The inset shows the experimental setup.

Image of FIG. 2.
FIG. 2.

Temperature dependence of for 1- and 2-UC films (S1) at and different magnetic fields [mT]: 0 (circles), 2 (squares), 3 (triangles), and 4 (crosses). The solid lines curves shows at zero field. The thin solid lines are quadratic fits to below and for magnetic field data. Also shown is the theoretical BKT function (dashed line).

Image of FIG. 3.
FIG. 3.

Temperature dependence of dc (squares), (circles) at and at (solid line) for a 3-UC sample (S1). Inset shows the universal plot: vs . Arrows indicate the values determined from the dc resistivity, loss function at and MW measurements .

Image of FIG. 4.
FIG. 4.

The penetration depth derived from vs normalized temperature for: 1-UC (crosses), 2-UC (squares) and 3-UC (circles) films.

Image of FIG. 5.
FIG. 5.

Temperature variations of for sample. The inset shows versus BCS reduced temperature.

Image of FIG. 6.
FIG. 6.

Superfluid density, , of the single crystal sample and thin film (crosses). The predicted behavior of within the two-band model as described in the text is shown by the solid, dashed ( band) and dotted ( band) lines. The solid line represent BCS fit of data using as fit parameter.

Image of FIG. 7.
FIG. 7.

Magnetic field variation of of a single crystal sample at different temperatures [K]: 5.66, 5.53, 5.02, 4.06, 3.45, 2.84, 2.15 and 1.43, from left to right. The solid lines are a guide for the eye. The arrow describes how has been deduced.

Image of FIG. 8.
FIG. 8.

Temperature variations of of . Symbols: the onset data determined from (circles) and (squares). Dotted line is the BCS data determined from the HW formula.33

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/content/aip/journal/ltp/32/8/10.1063/1.2219506
2006-08-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides
http://aip.metastore.ingenta.com/content/aip/journal/ltp/32/8/10.1063/1.2219506
10.1063/1.2219506
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