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A spin-singlet ground state with a spin gap has been discovered inantiferromagnetic spin chain substances when the spin value is 1/2, 1 or 2. Tofind spin gap (singlet-triplet) excitations in spin-3/2 chain substances, weperformed inelastic neutron scattering and magnetization measurements on {\itR}CrGeO$_5$ ({\it R} = Y or Sm) powders. As expected, we observed spin gapexcitations and the dispersion relation of the lowest magnetic excitations. Weproved that the spin system of Cr$^{3+}$ was an antiferromagnetic alternatingspin-3/2 chain.

physical review. b, condensed matter and materials physics

Experimental confirmation of spin gap in antiferromagnetic alternating  spin-3/2 chain substances RCrGeO5 (R = Y or 154Sm) by inelastic neutron  scattering experiments