Spin valve effect in single-atom contacts

Stable single-atom contacts of zinc whiskers

We report low-temperature measurements of the electrical transport properties of single-atom and tunnel contacts of Zn. We present a variant of the mechanically controllable break-junction technique that comprises a whisker as the central part. This technique combines the possibility to fabricate reproducibly single-atom contacts and well-characterized electronic and lattice properties of the e...

Single - Atom Spin - Flip Spectroscopy

There is still some dispute over whether the relationship is entirely consistent with Bayesian updating (37). 14. R. M. Dawes, J. Exp. Soc. Psychol. 25, 1 (1989). 15. D. Fudenberg, J. Tirole, Game Theory (MIT Press, Cambridge, MA, 2000). 16. With finite players, the truth-telling result holds provided that the number of players exceeds some finite n, which in turn depends on p(<). 17. J. M. Ber...

Spin valve effect and magnetoresistivity in single crystalline Ca3Ru2O7.

The laminar perovskite Ca3Ru2O7 naturally forms ferromagnetic double layers of alternating moment directions, as in the spin-valve superlattices. The mechanism of the huge magnetoresistive effect in the material has been controversial due to a lack of clear understanding of various magnetic phases and phase transitions. In this neutron diffraction study in a magnetic field, we identify four dif...

Conduction channels at finite bias in single-atom gold contacts

Kondo effect in single atom contacts: the importance of the atomic geometry.

Co single atom junctions on copper surfaces are studied by scanning tunneling microscopy and ab initio calculations. The Kondo temperature of single cobalt atoms on the Cu(111) surface has been measured at various tip-sample distances ranging from tunneling to the point contact regime. The experiments show a constant Kondo temperature for a whole range of tip-substrate distances consistently wi...