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

T. Rõõm, U. Nagel, E. Lippmaa, H. Kageyama, K. Onizuka, and Y. Ueda
Phys. Rev. B 61, 14342 – Published 1 June 2000
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Abstract

Using far-infrared spectroscopy in magnetic fields up to 12 T we have studied a two-dimensional dimer spin gap system SrCu2(BO3)2. We found several infrared-active modes in the dimerized state (below 10 K) in the frequency range from 3 to 100cm1. The measured splitting from the ground state to the excited triplet MS=0 sublevel is Δ1=24.2cm1 and the other two triplet state sublevels in zero magnetic field are 1.4cm1 below and above the MS=0 sublevel. Another multiplet is at Δ2=37.6cm1 from the ground state. A strong electric dipole active transition polarized in the (ab) plane is activated in the dimer spin system below 15 K at 52cm1.

  • Received 13 September 1999

DOI:https://doi.org/10.1103/PhysRevB.61.14342

©2000 American Physical Society

Authors & Affiliations

T. Rõõm, U. Nagel, and E. Lippmaa

  • National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia

H. Kageyama, K. Onizuka, and Y. Ueda

  • Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106-8666, Japan

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Issue

Vol. 61, Iss. 21 — 1 June 2000

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