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Temperature-dependent spin gap and singlet ground state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">BaCuSi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:…
Bulk magnetic measurements and inelastic neutron scattering were used to investigate the magnetic properties of ${\mathrm{BaCuSi}}_{2}$${\mathrm{O}}_{6}$, a quasi-two-dimensional antiferromagnet with a square-lattice bilayer structure. The compound was shown to have a spin-singlet dimerized ground state with a gap \ensuremath{\Delta}\ensuremath{\approx}4.5 meV in the magnetic excitation spectrum. The dispersion of the gap …