Far infrared study of the two dimensional dimer spin system SrCu_2(BO_3)_2

(2) Institute for Solid State Physics; Biophysics; E. Lippmaa (1); Estonia; H. Kageyama (2); Japan); K. Onizuka (2); Tallinn; T. Room (1); U. Nagel (1)

arxiv: cond-mat/9909284 · v3 · submitted 1999-09-20 · ❄️ cond-mat.str-el · cond-mat.supr-con

Far infrared study of the two dimensional dimer spin system SrCu₂(BO₃)₂

T. Room (1) , U. Nagel (1) , E. Lippmaa (1) , H. Kageyama (2) , K. Onizuka (2) , Y. Ueda (2) ((1) National Institute of Chemical Physics , Biophysics , Tallinn

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Estonia (2) Institute for Solid State Physics University of Tokyo Japan)

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classification ❄️ cond-mat.str-el cond-mat.supr-con

keywords statebelowdimerspinsystemactivedeltaground

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Using far-infrared spectroscopy in magnetic fields up to 12T we have studied a two-dimensional dimer spin gap system SrCu_2(BO_3)_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 M_S=0 sublevel is Delta_1=24.2cm^-1 and the other two triplet state sublevels in zero magnetic field are 1.4cm^-1 below and above the M_S=0 sublevel. Another multiplet is at Delta_2=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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Far infrared study of the two dimensional dimer spin system SrCu₂(BO₃)₂

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