Using the bosonization technique, we have studied a spin-1/2 magnetic impurity in Heisenberg chain, and shown that the impurity specific heat and spin susceptibility have an anomalous temperature dependence. The temperature dependence of the impurity specific heat is: Cim(T ) ∼ T μ, μ = 4− 1 g (1− g)2, for gc < g < 1. The impurity spin susceptibility has the following temperature dependence: χi...

INVESTIGATION INTO PERPENDICULAR ANISOTROPY COBALT-CHROMIUM FILMS WITH APPLICATION TO WINCHESTER COMPUTER DISCS by NADER MAHVAN BSc, MSc , RF-spUttered CoCr films have been characterized for a variety o f deposition conditions, and the most effective parameters which bring about perpendicular anisotropy have been evaluated. In particular bias sputtering has been noted for its role in improving ...

In diffusive Cu and Au quantum wires at finite transport voltage U the non-equilibrium distribution function f(E,U) exhibits scaling behavior, f(E, U) = f(E/eU), indicating anomalous energy relaxation processes in these wires. We show that in nonequilibrium the Kondo effect, generated either by magnetic impurities (single-channel Kondo effect) or possibly by non-magnetic, degenerate two-level s...

We investigate the integrated density of states of the Schrr odinger operator in the Euclidean plane with a perpendicular constant magnetic eld and a random potential. For a Poisson random potential with a non-negative algebraically decaying single-impurity potential we prove that the leading asymptotic behaviour for small energies is always given by the corresponding classical result in contra...

We study the orbital magnetism of 2D lattices with chaotic motion of electrons withing a primitive cell. Using the temperature diagrammatic technique we evaluate the averaged value and rms fluctuation of magnetic response in the diffusive regime withing the model of non-interacting electrons. The fluctuations of magnetic susceptibility turn out to be large and at low temperature can be of the o...

We have undertaken a study of diluted magnetic semiconductors Ga1−xMnxN and Ga1−xCrxN with x = 0.0625, 0.125, using the all electron linearized augmented plane wave method (LAPW) for different configurations of Mn as well as Cr. We study four possible configurations of the impurity in the wurtzite GaN structure to predict energetically most favorable structure within the 32 atom supercell and c...

We resolve the controversy regarding the ground state of the parallel double quantum dot system near half filling. The numerical renormalization group predicts an underscreened Kondo state with residual spin-1/2 magnetic moment, ln2 residual impurity entropy, and unitary conductance, while the Bethe ansatz solution predicts a fully screened impurity, regular Fermi-liquid ground state, and zero ...

We consider a magnetic S = 1/2 impurity in the antiferromagnetic spin chain as a function of two coupling parameters: the symmetric coupling of the impurity to two sites in the chain J1 and the coupling between the two sites J2. By using field theory arguments and numerical calculations we can identify all possible fixed points and classify the renormalization flow between them, which leads to ...