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Structural phase transition in the 2D spin dimer compound SrCu 2 ( BO 3 ) 2 |
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| Authors: | K Sparta GJ 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 |
| Institution: | Institut für Kristallographie, RWTH Aachen, J?gerstr. 17-19, 52056 Aachen, Germany, DE Physikalisches Institut, RWTH Aachen, Sommerfeldstr., 52056 Aachen, Germany, DE Institut für Anorgan. Chemie, Prof.-Pirlet-Str. 1, RWTH Aachen, 52056 Aachen, Germany, DE Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Tokyo 106-8666, Japan, JP |
| 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. Received 24 July 2000 and Received in final form 2 November 2000 |
| Keywords: | 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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