Typical curve of a contact in the region of the superconducting transition of Pb for a contact not manifesting “proximity” effects. The inset shows the structure of the contact and the measurement scheme.
Normalized conductance of , , and contacts for which “proximity” effects are unimportant (curves 1, 2, and 3, respectively). A pronounced downward peak is observed, due to the ordinary Andreev reflection from the “half-metal” LCMO.
curve of a contact, exhibiting the proximity effect. A fall of the resistance is observed at the transition of the Pb injector to the superconducting state. The inset shows the conductance for the same contact.
The current–voltage characteristic and normalized conductance of a contact that manifests the induced superconductivity effect in the LCMO. An excess current and a doubling of the conductance of the contact at are observed.
Differential conductance of a series of contacts manifesting the proximity effect. The curves are shifted for convenience.
Temperature dependence of the conductance of a “proximity” contact. The curves are shifted for convenience.
Current–voltage characteristic of a contact (CP#9). Here is the resistance of the contact in the normal state (dashed line). The arrows indicate the values of the voltage across the contact at which “phase slip” occurs: the contact resistance suffers a jumplike increase due to discrete destruction of superconductivity in the manganite.
Current–voltage characteristic and normalized conductance of a contact manifesting the induced superconductivity effect in the LCMO. One observes an excess current and doubling of the conductance of the contact at .
Differential conductance of a series of contacts manifesting the proximity effect. The curves have been shifted for convenience.
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