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Superconductivity of bulk molybdenum samples with carbidized surfaces
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10.1063/1.3530191
/content/aip/journal/ltp/36/12/10.1063/1.3530191
http://aip.metastore.ingenta.com/content/aip/journal/ltp/36/12/10.1063/1.3530191

Figures

Image of FIG. 1.
FIG. 1.

Transverse cross section e-e (see below) of a molybdenum sample with a carbidized surface. Below: a schematic illustration of a sample of width W with letters indicating the pairs of potential contacts over the sample length L.

Image of FIG. 2.
FIG. 2.

X-ray diffraction patterns of samples of uncarbidized molybdenum and of molybdenum after treatment of its surface with carbon ions.

Image of FIG. 3.
FIG. 3.

Temperature evolution of the superconducting transition of a Mo–C(1) sample as a function of the efficiency of carbidization of the Mo surface: uncarbonized region (a); regions of the sample with different thickness and continuity of a carbidized Mo layer at the surface (b, c, d). The values of at room temperature for these regions are listed in the upper left of the figure.

Image of FIG. 4.
FIG. 4.

Temperature evolution of the transition from the normal conducting to the superconducting state of an Mo–C(2) sample as a function of the efficiency with which the Mo surface is carbidized in units of “resistance per square” : uncarbonized region (a); regions of the sample with different thicknesses and degrees of continuity of the carbidized surface at the Mo surface (b, c, d). The values of for these regions at room temperature are listed in the figure.

Image of FIG. 5.
FIG. 5.

Typical variations in the resistance of the carbidized segments of the Mo samples with magnetic field at temperatures close to critical.

Image of FIG. 6.
FIG. 6.

Model of a mosaic-island structure for the carbidized layer of molybdenum with NS boundaries.

Image of FIG. 7.
FIG. 7.

First derivatives of the superconducting transition curves in Figs. 3 and 4.

Image of FIG. 8.
FIG. 8.

Temperature dependences of the contact resistance (smooth curves) in the region of the superconducting transitions (Fig. 4) in segments b (squares with curve 1) and c (circles with curve 2) of a Mo–C(2) sample calculated using Eqs. (6) and (7).

Tables

Generic image for table
Table I.

Thicknesses of the layers of molybdenum carbide on molybdenum in segments a–d (Fig. 1) for samples at room and liquid helium temperatures.

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/content/aip/journal/ltp/36/12/10.1063/1.3530191
2011-01-20
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconductivity of bulk molybdenum samples with carbidized surfaces
http://aip.metastore.ingenta.com/content/aip/journal/ltp/36/12/10.1063/1.3530191
10.1063/1.3530191
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