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Bromine nuclear quadrupole resonance study of PrBr3

Measurements of the bromine nuclear quadrupole resonance frequency and spin-spin relaxation time (T2) are reported for praseodymium tribromide (PrBr3) from 4.2 K to 0.125 K. The frequency data indicate that at T=0.130 K a phase transition to a three-dimensional antiferroelectric ordered state occurs. This distortion is believed to be a Peierls dimerization; a dimerization parameter is deduced. The T2 results, which are not understood in detail, are shown to be due to a magnetic dipole interaction mechanism.