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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

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arxiv 1404.6297 v1 pith:HRIQKDMA submitted 2014-04-25 cond-mat.str-el

M. Hase , M. Soda , T. Masuda , D. Kawana , T. Yokoo , S. Itoh , A. Matsuo , K. Kindo
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M. Kohno
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classification cond-mat.str-el
keywords spinchainantiferromagneticexcitationsspin-3substancesalternatinginelastic
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abstract

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.

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