https://doi.org/10.1007/s100510170296
Structural phase transition in the 2D spin dimer compound SrCu2(BO3)2*
1
Institut für Kristallographie, RWTH Aachen, Jägerstr. 17-19, 52056 Aachen, Germany
2
Physikalisches Institut, RWTH Aachen, Sommerfeldstr., 52056 Aachen, Germany
3
Institut für Anorgan. Chemie, Prof.-Pirlet-Str. 1, RWTH Aachen, 52056 Aachen, Germany
4
Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Tokyo 106-8666, Japan
Corresponding author: a roth@kristall.xtal.rwth-aachen.de
Received:
24
July
2000
Revised:
2
November
2000
Published online: 15 February 2001
A displacive, 2nd order structural phase transition at 
K from space group I 
2 m below Ts to I 4/m c m above Ts 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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
