Abstract
As revealed in the powder X-ray diffraction and crystallographic data, the parent compound LaPtSi, which crystallizes in the LaPtSi-type structure (I41md), admits considerable vacancies up to 20% on the Pt sublattice while still retaining its tetragonal symmetry. The refined lattice parameters show that both the a-axis and the volume of the unit cell v contract clearly, though the c-axis exhibits less percentage change due to the existence of vacancies in the compound. These results are consonant with what one would expect from a chemical pressure effect. Magnetic and heat-capacity measurements demonstrate that the change in Tc with x is similar to the change in the reduced lattice parameters a and v. It is found that the Tc change rate dTc/dx=−9.6±0.6K and dTc/dv=1.5±0.3K/Å3.
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