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