Nuclear relaxation and antiferromagnetic critical effects in organic conductors

C. Bourbonnais*, P. Stein, D. Jérome, A. Moradpour

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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.

TidsskriftPhysical Review B
Udgave nummer11
Sider (fra-til)7608-7614
Antal sider7
StatusUdgivet - 1. jan. 1986

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