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We have investigated break junctions of normal non-magnetic metals as well asferromagnets at low temperatures. The point contacts with radii 0.15 - 15 nmshowed zero-bias anomalies which can be attributed to Kondo scattering at asingle Kondo impurity at the contact or to the switching of a single conductingchannel. The Kondo temperatures derived from the width of the anomalies variedbetween 10 and 1000 K. These results agree well with literature data onatomic-size contacts of the ferromagnets as well as with spear-anvil typecontacts on a wide variety of metals.

Break-junction experiments on the zero-bias anomaly of non-magnetic and ferromagnetically ordered metals