ar X iv : c on d - m at / 9 90 50 41 v 1 4 M ay 1 99 9 Heavy - Fermions in a Transition - Metal Compound : LiV

ar X iv : c on d - m at / 9 50 50 09 v 2 5 M ay 1 99 5 Magnetic Transition Temperature of ( La , Sr ) MnO 3

Using the Kondo lattice model with classical spins in infinite dimension, magnetic phase transition in the perovskite-type 3d transition-metal oxide La1−xSrxMnO3 is theoretically studied. On the Bethe lattice, the self-consistency equations are solved exactly. Curie temperatures at the region of double-exchange ferromagnetism 0.1 <∼ x <∼ 0.25 as well as the Nèel temperature at x = 0 are well re...

ar X iv : h ep - l at / 9 90 50 15 v 1 1 1 M ay 1 99 9 WILSON FERMIONS ON A RANDOMLY TRIANGULATED MANIFOLD

A general method of constructing the Dirac operator for a randomly trian-gulated manifold is proposed. The fermion field and the spin connection live, respectively, on the nodes and on the links of the corresponding dual graph. The construction is carried out explicitly in 2-d, on an arbitrary orientable manifold without boundary. It can be easily converted into a computer code. The equivalence...

ar X iv : n uc l - th / 9 90 50 49 v 1 2 1 M ay 1 99 9 η - and η ′ - meson production in the reaction pn → dM near threshold

ar X iv : n uc l - th / 9 90 50 49 v 2 2 6 M ay 1 99 9 η - and η ′ - meson production in the reaction pn → dM near threshold

ar X iv : p at t - so l / 9 90 50 05 v 1 2 1 M ay 1 99 9 Discrete breathers in systems with homogeneous potentials - analytic solutions

We construct lattice Hamiltonians with homogeneous interaction potentials which allow for explicit breather solutions. Especially we obtain exponentially localized solutions for d-dimensional lattices with d = 2, 3.