Hydrogen in actinides: electronic and lattice properties.

Hydrides of actinides, their magnetic, electronic, transport, and thermodynamic properties are discussed within a general framework of H impact on bonding, characterized by volume expansion, affecting mainly the 5states, and a charge transfer towards H, which influences mostly the 6and 7states. These general mechanisms have diverse impact on individual actinides, depending on the degree of localization of their 5states. Hydrogenation of uranium yields UHand UH, binary hydrides that are strongly magnetic due to the 5band narrowing and reduction of the 5-6hybridization.

Role of the Magnetic Anisotropy in Atomic-Spin Sensing of 1D Molecular Chains.

One-dimensional metal-organic chains often possess a complex magnetic structure susceptible to modification by alteration of their chemical composition. The possibility to tune their magnetic properties provides an interesting playground to explore quasi-particle interactions in low-dimensional systems. Despite the great effort invested so far, a detailed understanding of the interactions governing the electronic and magnetic properties of the low-dimensional systems is still incomplete.

Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas.

We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO. X-ray magnetic circular dichroism reveals slow relaxation of the Dy magnetization on a time scale of about 800 s at 2.5 K, unusually associated with an easy-plane magnetic anisotropy.

Electronic properties of PuOs simulating β-Pu: the strongly correlated Pu phase.

We established the basic electronic properties of ζ-PuOs, which is a close analogue to β-Pu, and its low-temperature variety, η-PuOs. Their magnetic susceptibility is 15% higher than for δ-Pu. A specific heat study of ζ-PuOs shows a soft lattice similar to δ-Pu, leading to a low Debye temperature Θ   =  101 K.

Magnetic character of holmium atom adsorbed on platinum surface.

We address a recent controversy concerning the magnetic state of holmium adatom on platinum surface. Within a combination of the density functional theory (DFT) with the exact diagonalization (ED) of Anderson impurity model, the 〈J 〉 = 0 paramagnetic ground state |J = 8, J  = ±8〉 is found. In an external magnetic field, this state is transformed to a spin-polarized state with 〈J 〉 ≈ 6.