13CNMR and static magnetic susceptibility inC60superconductors: Possible influence of Kondo impurity

NMR and static magnetic susceptibility in C60 superconductors: Possible influence of Kondo impurity

The static spin susceptibility, xs SQ and xs NMR , in C60 superconductors K3C60 and Rb3C60 was studied using a dc superconducting quantum interference device magnetometer and C NMR. We found that xs SQ has a peculiar temperature ~T! dependence behaving as (12CT) with a positive constant C;(1310) deg, contrary to the almost T independent xs NMR . These observations indicate a possibility that th...

Dynamics of a tunneling magnetic impurity: Kondo effect induced incoherence.

We study how the formation of the Kondo compensation cloud influences the dynamical properties of a magnetic impurity that tunnels between two positions in a metal. The Kondo effect dynamically generates a strong tunneling impurity-conduction electron coupling, changes the temperature dependence of the tunneling rate, and may ultimately result in the destruction of the coherent motion of the pa...

Magnetic susceptibility of nanoscale Kondo systems

Kondo Engineering : from Single Kondo Impurity to the Kondo Lattice

In the first step, experiments on a single cerium or ytterbium Kondo impurity reveal the importance of the Kondo temperature by comparison to other type of couplings like the hyperfine interaction, the crystal field and the intersite coupling. The extension to a lattice is discussed. Emphasis is given on the fact that the occupation number n f of the trivalent configuration may be the implicit ...

Oscillations of the magnetic polarization in a Kondo impurity at finite magnetic fields

The electronic properties of a Kondo impurity are investigated in a magnetic field using linear response theory. The distribution of electrical charge and magnetic polarization are calculated in real space. The (small) magnetic field does not change the charge distribution. However, it unmasks the Kondo cloud. The (equal) weight of the d-electron components with their magnetic moment up and dow...