We report the charge state modification effects at the Mn site on the ground state properties of colossal magnetoresistive manganites. Ta<Superscript>5+</Superscript> substitution results in an appreciable increase in the lattice parameters and unit cell volume due to increased Mn<Superscript>3+</Superscript> concentration. The...</superscript></superscript>

We have investigated the effect of the magnetic field (B) on the very low-temperature equilibrium heat capacity c<Subscript>eq</Subscript> of the quasi-1 D organic compound (TMTTF)<Subscript>2</Subscript>Br, characterized by a commensurate Spin Density Wave (SDW) ground state. Below 1 K, c<Subscript>eq</Subscript> is dominated by a Schottky-like A<Subscript>S</Subscript>T<Superscript>-2</Superscript>...</superscript></subscript></subscript></subscript></subscript>