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Structural phase transition in the 2D spin dimer compound SrCu 2 (BO 3 ) 2

  • K. Sparta
  • G.J. Redhammer
  • P. Roussel
  • G. Heger
  • G. Roth
  • P. Lemmens
  • A. Ionescu
  • M. Grove
  • G. Güntherodt
  • F. Hüning
  • H. Lueken
  • H. Kageyama
  • K. Onizuka
  • Y. Ueda

Abstract:

A displacive, 2nd order structural phase transition at T s = 395 K from space group I 2 m below T s to I 4/m c m above T s has been discovered in the two-dimensional spin dimer compound SrCu2(BO3)2. The temperature evolution of the structure in both phases has been studied by X-ray diffraction and Raman scattering, supplemented by differential scanning calorimetry and SQUID magnetometry. The implications of this transition and of the observed phonon anomalies in Raman scattering for spin-phonon and interlayer coupling in this quantum spin system will be discussed.

PACS. 75.10.jm Quantized spin models – 61.10.-i X-ray diffraction and scattering – 78.30.-j Infrared and Raman spectra 

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Copyright information

© EDP Sciences, Springer-Verlag 2001

Authors and Affiliations

  • K. Sparta
    • 1
  • G.J. Redhammer
    • 1
  • P. Roussel
    • 1
  • G. Heger
    • 1
  • G. Roth
    • 1
  • P. Lemmens
    • 2
  • A. Ionescu
    • 2
  • M. Grove
    • 2
  • G. Güntherodt
    • 2
  • F. Hüning
    • 3
  • H. Lueken
    • 3
  • H. Kageyama
    • 4
  • K. Onizuka
    • 4
  • Y. Ueda
    • 4
  1. 1.Institut für Kristallographie, RWTH Aachen, Jägerstr. 17-19, 52056 Aachen, GermanyDE
  2. 2.Physikalisches Institut, RWTH Aachen, Sommerfeldstr., 52056 Aachen, GermanyDE
  3. 3.Institut für Anorgan. Chemie, Prof.-Pirlet-Str. 1, RWTH Aachen, 52056 Aachen, GermanyDE
  4. 4.Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Tokyo 106-8666, JapanJP

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