engleski

Spin-Peierls fluctuations in (TMTTF)2Br studied by pulsed electron spin resonance spin-lattice relaxation

Spin-Peierls lattice fluctuations were studied in the paramagnetic phase of the antiferromagnetic compound (TMTTF)2Br by pulsed electron spin resonance spin-lattice relaxation experiment. The relaxation via long-wavelength acoustic phonons was found to coexist with the relaxation via spin fluctuation, becoming the dominant relaxation mechanism in the temperature interval between about 50 K and just above the antiferromagnetic phase transition. This gives direct evidence on the presence of long-wavelength lattice fluctuations in the investigated temperature range.

Spin-Peierls ; fluctuations ; spin-lattice relaxation

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