Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 72, Issue 12, Pages 3243-3253Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.72.3243
Keywords
SrCU2(BO3)(2); spin gap; ESR; magnetic excitation; high magnetic field
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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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