J. Baier

Evidence for a low-spin to intermediate-spin state transition in LaCoO 3

We present measurements of the magnetic susceptibility and of the thermal expansion of a LaCoO 3 single crystal. Both quantities show a strongly anomalous temperature dependence. Our data are consistently described in terms of a spin-state transition of the Co 3 + ions with increasing temperature from a low-spin ground state (t 6 2 g e 0 g ) to an intermediate-spin state (t 5 2 g e 1 g ) without (100-500 K) and with (>500 K) orbital degeneracy. We attribute the lack of orbital degeneracy up to 500 K to (probably local) Jahn-Teller distortions of the CoO 6 octahedra. A strong reduction or disappearance of the Jahn-Teller distortions seems to arise from the insulator-to-metal transition around 500 K.

Structure, magnetization, and resistivity of La 1 − x M x CoO 3 ( M = Ca , Sr, and Ba)

We present an investigation of the influence of structural distortions in charge-carrier doped

Spin-state transition and metal-insulator transition in La 1 − x Eu x Co O 3

{\mathrm{La}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{CoO}}_{3}

Crystal and magnetic structure of LaTiO 3 : Evidence for nondegenerate t 2 g orbitals

by substituting

Magnetoelastic coupling in RETiO3 (RE = La, Nd, Sm, Gd, Y)

{\mathrm{La}}^{3+}

Hysteresis effects in the phase diagram of multiferroic GdMnO 3

with alkaline-earth metals of strongly different ionic sizes, that is,

Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR

M={\mathrm{Ca}}^{2+},

Anomalous thermal expansion and strong damping of the thermal conductivity of NdMnO3 and TbMnO3 due to 4f crystal-field excitations

{\mathrm{Sr}}^{2+},

Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl.

and