Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-07-29
Physics
Condensed Matter
Strongly Correlated Electrons
28 pages, RevTeX (using epsfig), 8 eps figures included, submitted to PRB
Scientific paper
10.1103/PhysRevB.57.11598
Motivated by the recent measurements of Kondo resistivity in thin films and wires, where the Kondo amplitude is suppressed for thinner samples, the surface anisotropy for magnetic impurities is studied. That anisotropy is developed in those cases where in addition to the exchange interaction with the impurity there is strong spin-orbit interaction for conduction electrons around the impurity in the ballistic region. The asymmetry in the neighborhood of the magnetic impurity exhibits the anisotropy axis $n$ which, in the case of a plane surface, is perpendicular to the surface. The anisotropy energy is $\Delta E=K_d (nS)^2$ for spin $S$, and the anisotropy constant $K_d$ is inversionally proportional to distance $d$ measured from the surface and $K_d>0$. Thus at low temperature the spin is frozen in a singlet or doublet of lowest energy. The influence of that anisotropy on the electrical resistivity is the subject of the following paper (part II).
Újsághy Orsolya
Zawadowski Alfred
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