AC-susceptibility measurements on the singlet-ground state system Cs3CraBrQ are extended to very low temperatures (46 mK) and high applied magnetic fields (12 T). The resulting phase diagram is shown to exhibit features at variance with recent soft-mode and molecular-field models for this system.
AbstraeL Optical Zeeman studies are reponed Tor the ordered region of the singlet ground stale dimer system Cs3Cr2Brg. 'he results are "pared with earlier neutron scamring and AC susceptibility studies. and a modcl is suggested which not only describes the optical data, but also produces an excellent fit to lhe phase diagram as defined bj lhe susceptibility results.
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