The superconducting transition of a silver solder alloy has been detected at 64.4 mK. This will make the alloy unsuitable as a medium for thermal contact at ultralow temperatures and may interfere with magnetic thermometry.

Topics
Superconductivity, Temperature metrology, Transition metals, Alloys
1.
Trademark of Castolin S. A., Lausanne St‐Sulpice, Switzerland.
2.
Silvaloy 355, Silver Products, 231 New Jersey Railroad Ave., Newark, N.J. 07105.
3.
V. P.
Peshkov
 and
A. Ya.
Parshin
,
Sov. Phys. JETP
21
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(
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© 1972 The American Institute of Physics.
1972
The American Institute of Physics
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