Photoinduced effects in a single crystal of bilayered manganites, La2−2xSr1+2xMn2O7 (x=0.38), were investigated in a wide range of temperatures by pump-probe measurement at a photon energy of 1.6eV. In a ferromagnetic metallic state, significant enhancement of positive rise in differential reflectivity with a slow relaxing time of hundred picoseconds was observed just below TC=127K, indicating ...

We compute the vibronic spectrum of gas phase fullerene negative ions C60 and C 2− 60 . We treat accurately the linear dynamical Jahn-Teller of these ions in their ground state. In particular, coupling of the t1u orbital to the eight Hg vibrational modes is handled by exact diagonalizations including up to six vibrons. The resulting spectrum is characterized by large splittings, which should be...

The Cu —O bond lengths in the pseudooctahedral bis(methoxyacetato)diaquo-copper(II) com­ plex are determined by the Jahn-Teller effect on the one hand and by the bonding properties of the three different oxygen ligator atoms (from a carboxylate. water and ether group) on the other. It is derived from EPR single crystal and powder investigations between 4.2 and 350 K, that the system becomes flu...

We use a two-orbital double-exchange model including superexchange interactions, Jahn-Teller lattice distortions, and long-range Coulomb interactions to investigate the origin of magnetically disordered interfaces between ferromagnetic metallic (FM) and antiferromagnetic insulating (AFI) manganites in FM/AFI superlattices. The induced magnetic moment in the AFI layer varies nonmonotonically wit...

Noting that current chemical theory is based almost exclusively on electronic energy and spin variables the equal importance of orbital angular momentum is explored in this paper. From its classical definition the angular momentum of electrons in an atom is shown to obey Laplace’s equation, which automatically leads to discrete values in terms of spherical harmonics. This analysis assumes a con...

Variable temperature EPR spectra of KNilOß • 0.5 H2O have established that the paramagnetic behavior of this compound (~ 1 BM) is due to the presence of nickel(III) atoms which have occupied some nickel(IV) sites in the crystal lattices. Change of spectral pattern from rhombic (77 K) to isotropic (300 K) is due to a dynamic Jahn-Teller effect. Electrical conductivity measurement has shown it to...

The local and intermediate structure of La1 xCaxMnO3 has been studied in the orthorhombic (O) and pseudo-cubic ðO0Þ phases, both as a function of temperature ðx 1⁄4 0:00Þ, and as a function of Ca content (at 310K). Neutron powder diffraction-based high real space resolution atomic pair distribution function (PDF) analysis shows that the Jahn Teller distortion of the MnO6 octahedra persists loca...

Recently it has been shown that pseudospin symmetry has its origins in a relativistic symmetry of the Dirac Hamiltonian. Using this symmetry we relate single nucleon relativistic magnetic moments of states in a pseudospin doublet to the relativistic magnetic dipole transitions between the states in the doublet, and we relate single nucleon relativistic Gamow Teller transitions within states in ...

Paramagnetic ions will influence the thermal expansion of an insulating crystal at temperatures close the Schottky specific heat peak. When the ion exhibits a dynamic Jahn-Teller effect, tunneling between different modes . distortion can occur. The sensitivity of the level splittings to the height of the tunnelling barrier then leads to an exce R tionally .large contribution. Experimental inves...

The results of calculations on static Jahn-Teller ground state splittings inicosahedral C 60 ðN 1⁄4 1; . . . ; 4Þ fullerene anions with different types of electron-electron interaction are presented. Multielectron states of anions are determined within a quasy-p-electronic model configuration interaction (CI) method for two active spaces of t1u and t1uþ t1g molecular orbitals. Electron–lattice ...