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Relief of frustration in the Heisenberg pyrochlore antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Gd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Pt</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>
The gadolinium pyrochlores ${\mathrm{Gd}}_{2}{B}_{2}{\mathrm{O}}_{7}$ are among the best realizations of antiferromagnetically coupled Heisenberg spins on a pyrochlore lattice. We present a magnetic characterization of ${\mathrm{Gd}}_{2}{\mathrm{Pt}}_{2}{\mathrm{O}}_{7}$, a unique member of this family. Magnetic susceptibility, heat capacity, and muon spin relaxation measurements show that ${\mathrm{Gd}}_{2}{\mathrm{Pt}}_{2}{\mathrm{O}}_{7}$ undergoes an antiferromagnetic ordering transition at ${T}_{N}=1.6$ …