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

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

preprint2014arXivOpen access
M. HaseM. SodaT. MasudaD. KawanaT. YokooS. ItohA. MatsuoK. KindoM. Kohno
cond-mat.str-el
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M. HaseM. SodaT. MasudaD. KawanaT. YokooS. ItohA. MatsuoK. KindoM. Kohno

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