1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Spatially selective and reversible doping control in cuprate films
Rent:
Rent this article for
USD
10.1063/1.2138356
/content/aip/journal/apl/87/23/10.1063/1.2138356
http://aip.metastore.ingenta.com/content/aip/journal/apl/87/23/10.1063/1.2138356
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Detailed process steps to obtain S-AFI-S or OS-US-OS junction. Step 1: Cuprate film grown on a substrate. Step 2: Si-overlayer deposited using lithography and lift-off; top view of the device after this step is shown in Fig. 2(a). Step 3: High temperature (450 °C) annealing in vacuum to reduce oxygen content in the entire film. Step 4: Low temperature (250 °C) annealing in ozone to oxidize outside Si-overlayered region. (b) An alternative procedure, which we have not used but is equally valid, to make the same final pattern. This second procedure is different from (a) only in steps 2 and 3 in that high temperature annealing to reduce oxygen is done before the overlayer is deposited. This procedure may be useful if the overlayer is not compatible with the high temperature process.

Image of FIG. 2.
FIG. 2.

(Color online) Resistance vs temperature plots for S-AFI-S junctions at different stages. (a) Top view of the junction structure and the four point probe geometry. Si-overlayer of width is shown. (b) Before step 3 in Fig. 1(a), both junctions with and without a Si-overlayer are superconducting near 80 K. (c) After step 4, Si-overlayered region has become insulating, while the control junction without any Si-overlayer remains superconducting with almost the same as in (b). (d) After the sample is exposed to ozone at a high temperature, the insulating sample has become superconducting again with of 80 K. This verifies that the insulating behavior in (c) is due to oxygen deficiency and not due to sample damage.

Image of FIG. 3.
FIG. 3.

Current vs electric field plot for S-AFI-S junctions. Note the severe nonlinearity. Straight lines at large electric field correspond to a power law dependence of . Electric field is defined as the voltage divided by the width of each Si overlayer. Curves of different widths do not overlap. This implies that the actual oxygen deficient linewidths are smaller than the overlayer widths due to nonzero oxygen diffusion length. This effect can be minimized by optimizing the oxidation temperature and time during step 4 in Fig. 1(a).

Image of FIG. 4.
FIG. 4.

(Color online) Resistance vs temperature for OS-US-OS junctions; (a) and (b) differ only in the vertical axis format. For and , the transitions at the higher temperature (80 K) are from the outer conductors (OS) and the transitions at the lower temperature (40 K) are from the central region under the Si overlayer (US). For , only one transition occurs at the lower temperature because the resistance is dominated by the wide underdoped superconductor (US).

Loading

Article metrics loading...

/content/aip/journal/apl/87/23/10.1063/1.2138356
2005-12-01
2014-04-21
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spatially selective and reversible doping control in cuprate films
http://aip.metastore.ingenta.com/content/aip/journal/apl/87/23/10.1063/1.2138356
10.1063/1.2138356
SEARCH_EXPAND_ITEM