ESR Study on the Excited State Energy Spectrum of SrCu2(BO3)2-A Central Role of Multiple-Triplet Bound States-

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  • ESR Study on the Excited State Energy Spectrum of SrCu2(B03)2--A Central Role of Multiple-Triplet Bound States
  • ESR Study on the Excited State Energy Spectrum of SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub>–A Central Role of Multiple-Triplet Bound States–
  • ESR study on the excited state energy spectrum of SrCu2(BO3)2

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Abstract

The excited state energy spectrum of a two-dimensional dimer system SrCu2(BO3)2 has been investigated by high field ESR. Besides two non-degenerated one-triplet excitations, various types of multiple-triplet bound states are identified: singlet, triplet, and quintet. The intensity of these bound states is extremely strong because one-triplet process is strongly suppressed in the orthogonal dimer system. The bound singlet state is found slightly below the energy gap of the one-triplet state, indicating the proximity to a quantum critical point. A band of the two-triplet bound state splits due to distant neighbor interactions. The bound quintet state is the direct evidence of two-triplet object made up of four S=1⁄2 spins. The energy of the lowest quintet becomes lower than that of the one-triplet excitation before the closing of the lowest spin gap, namely, the quintet touches first to the ground singlet state. The present investigation exhibits an essential role of multiple-triplet bound states in the magnetic excitation spectrum.

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