Article Dans Une Revue Physical Review B: Condensed Matter (1978-1997) Année : 1986

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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hal-04944361 , version 1 (22-03-2025)

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C. Bourbonnais, P. Stein, D. Jérome, A. Moradpour. Nuclear relaxation and antiferromagnetic critical effects in organic conductors. Physical Review B: Condensed Matter (1978-1997), 1986, 33 (11), pp.7608-7614. ⟨10.1103/PhysRevB.33.7608⟩. ⟨hal-04944361⟩
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