Far infrared study of the two dimensional dimer spin system SrCu2(BO3)2
Abstract
Using far-infrared spectroscopy in magnetic fields up to 12T we have studied a two-dimensional dimer spin gap system SrCu2(BO3)2. We found several infrared active modes in the dimerized state (below 10K) in the frequency range from 3 to 100cm-1. The measured splitting from the ground state to the excited triplet MS=0 sublevel is Delta1=24.2cm-1 and the other two triplet state sublevels in zero magnetic field are 1.4cm-1 below and above the MS=0 sublevel. Another multiplet is at Delta2=37.6cm-1 from the ground state. A strong electric dipole active transition polarized in the (ab)-plane is activated in the dimer spin system below 15K at 52cm-1.
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