Direct observation of the multiple spin gap excitations in two-dimensional dimer system SrCu2(BO3)2

Details Direct observation of the multiple spin gap excitations in two-dimensional dimer system SrCu2(BO3)2 Direct observation of the multiple spin gap excitations in two-dimensional dimer system SrCu2(BO3)2

1999-06-05

arxiv.org/abs/cond-mat/9906072v1

J. Phys. Soc. Jpn., 68 (1999) 2906-2909 http://wwwsoc.nacsis.ac.jp/jps/jpsj/

Physics

Condensed Matter

Strongly Correlated Electrons

4pages 4figures

Scientific paper

10.1143/JPSJ.68.2906

Various spin gap excitations have been observed in the two-dimensional dimer system SrCu_2(BO_3)_2 by means of submillimeter wave ESR. The zero-field energy gap of the lowest spin gap excitation shows a splitting into two triplet modes and the energy splitting clearly depends on the magnetic field orientation when a field is rotated in the {\mib {ac}}-plane. A zero-field splitting is also found between the S(_z)=+1 and S(_z)=-1 branches of each triplet. These behaviors are qualitatively explained by considering the anisotropic exchange coupling of inter-dimer and intra-dimer, respectively. The averaged value of the lowest spin gap energy is determined to be 722 \pm 2 GHz(34.7 K). We have also found the second spin gap excitation at 1140 GHz(54.7 K), which indicates that the inter-dimer coupling is significantly strong. Besides these modes, a number of gapped ESR absorption are found and we propose that these multiple magnetic excitations are caused by the localized nature of the excited state in the present system.

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