Spin dimers under staggered and random field in Cu$_2$Fe$_2$Ge$_4$O$_{13}

Details Spin dimers under staggered and random field in Cu$_2$Fe$_2$Ge$_4$O$_{13} Spin dimers under staggered and random field in Cu$_2$Fe$_2$Ge$_4$O$_{13}

2009-09-13

arxiv.org/abs/0909.2402v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, to be published in Phys. Rev. B RC

Scientific paper

We study $S=1/2$ dimer excitation in a coupled chain and dimer compound Cu$_2$Fe$_2$Ge$_4$O$_{13} by inelastic neutron scattering technique. The Zeeman split of the dimer triplet by a staggered field is observed at low temperature. With the increase of temperature the effect of random field is detected by a drastic broadening of the triplet excitation. Basic dynamics of dimer in the staggered and random fields are experimentally identified in Cu$_2$Fe$_2$Ge$_4$O$_{13}.

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