K. Siemensmeyer et M. Meschke, Polarisation analysis for the determination of magnetic structures in highmagnetic fields, PHYSICA B, 297(1-4), 2001, pp. 204-207
We have upgraded an existing two axis spectrometer for polarisation analysi
s experiments using supermirror polarisers. The instrument is fully compati
ble with a complex sample surrounding, including high magnetic fields up to
7T. The primary use of this spectrometer is the determination of spin dire
ctions. The polarisation analysis technique is well suited for problems whe
re only a few magnetic reflections can be investigated for the determinatio
n of a structure as it provides selection rules, in addition, to the well-k
nown dipolar selection rule. The instrument has been applied for the invest
igation of the field dependent phase diagram on K2IrCl6. There a multiple q
structure is identified in high field which presumably can only be explain
ed by the presence of biquadratic exchange interactions. (C) 2001 Elsevier
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