The Ru-Ru spin-singlet formation in La<Subscript>2 − x </Subscript> L n <Subscript> x </Subscript>RuO<Subscript>5</Subscript> (Ln=Pr, Nd, Sm, Gd, Dy) was investigated by measurements of the specific heat and magnetic susceptibility. After subtraction of the lattice contribution from the specific heat (C <Subscript> p </Subscript>), similar excess entropy values were obtained for...</subscript></subscript></subscript></subscript>

The magnetic and thermodynamic properties of the complete Ln<Subscript>2/3</Subscript>Cu<Subscript>3</Subscript>Ti<Subscript>4</Subs cript>O<Subscript>12</Subscript> series were investigated. Here Ln stands for the lanthanides La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. All the samples investigated crystallize in the space group <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$Im\bar{3}$</EquationSource> </InlineEquation> with lattice constants that...</equationsource></inlineequation></subscript><//subs></subscript></subscript></subscript>