Nuclear relaxation and antiferromagnetic critical effects in organic conductors
Résumé
We present and analyze H1 relaxation data of the spin-density-wave transition on oriented ditetramethyltetraselenafulvalenium phosphorus hexafluoride [(TMTSF)2PF6] single crystals at ambient pressure. A detailed analysis of the methyl-group rotation contribution to the nuclear relaxation rate T1-1 is made in the temperature domain precursor to the transition. We show that the singular profile of T1-1 can be well described as an antiferromagnetic critical effect with a three-dimensional classical exponent. The scaling form of the critical quantity (T1T)-1 in low-dimensional antiferromagnets with a nesting vector exhibiting a dimensionality crossover in temperature is derived and discussed in connection with the data.
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