S. Hébert

Ultrasharp magnetization steps in perovskite manganites.

We report a detailed study of steplike metamagnetic transitions in polycrystalline Pr0.5Ca0.5Mn0.95Co0.05O3. The steps have a sudden onset below a critical temperature, are extremely sharp (width <2x10(-4) T), and occur at critical fields which are linearly dependent on the absolute value of the cooling field in which the sample is prepared. Similar transitions are also observed at low temperature in non-Co doped manganites, including single crystal samples. These data show that the steps are an intrinsic property, qualitatively different from either previously observed higher temperature metamagnetic transitions in the manganites or metamagnetic transitions observed in other materials.

Strongly correlated properties of the thermoelectric cobalt oxide Ca3Co4O9

We have performed both in-plane resistivity, Hall effect, and specific heat measurements on the thermoelectric cobalt oxide

Magnetoresistance and magnetothermopower properties of Bi/Ca/Co/O and Bi(Pb)/Ca/Co/O misfit layer cobaltites

{\mathrm{Ca}}_{3}{\mathrm{Co}}_{4}{\mathrm{O}}_{9}

Textured Ca3Co4O9 thermoelectric oxides by thermoforging process

. Four distinct transport regimes are found as a function of temperature, corresponding to a low temperature insulating one up to

Perovskite manganites and layered cobaltites: potential materials for thermoelectric applications

{T}_{\mathit{min}}\ensuremath{\approx}63\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Field-Induced Magnetization Steps in Intermetallic Compounds and Manganese Oxides: The Martensitic Scenario

, a strongly correlated Fermi liquid up to

Quantum tunneling of the magnetization in the Ising chain compound Ca3Co2O6

{T}^{*}\ensuremath{\approx}140\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Important role of impurity eg levels on the ground state of Mn-site doped manganites

, with

Scaling behavior in thermoelectric misfit cobalt oxides.

\ensuremath{\rho}={\ensuremath{\rho}}_{0}+A{T}^{2}

Thermopower enhancement in misfit cobaltites

and