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Spin-resonance modes of the spin-gap magnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TlCuCl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Three kinds of magnetic-resonance signals were detected in crystals of the spin-gap magnet ${\mathrm{TlCuCl}}_{3}.$ First, we have found antiferromagnetic resonance absorption in the field-induced antiferromagnetic phase above the critical field ${H}_{c}.$ This resonance frequency is strongly anisotropic with respect to the direction of the magnetic field. The field dependence of …